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1.
In this paper, the capacity and error probability of maximal ratio combining (MRC) reception are considered for different
modulation schemes over correlated Nakagami fading channels. Based on an equivalent scalar additive white Gaussian noise (AWGN)
channel, we derive the characteristic function (CF) and the probability density function (PDF) of the signal to noise ratio
for MRC reception over Nakagami fading channels. Using these CF and PDF results, closed form error probability and capacity
expressions are obtained for PSK, PAM and QAM modulation.
Wei Li received his Ph.D. degree in Electrical and Computer Engineering from the University of Victoria in 2004. He is now a Post-doctoral
Research Fellow in the Department of Electrical and Computer Engineering at the University of Victoria. He is a Member of
the IEEE. His research interests include ultra-wideband system, spread spectrum communications, diversity for wireless communications,
and cellular communication systems.
Hao Zhang was born in Jiangsu, China, in 1975. He received his Bachelor Degree in Telecom Engineering and Industrial Management from
Shanghai Jiaotong University, China in 1994, his MBA from New York Institute of Technology, USA in 2001, and his Ph.D. in
Electrical and Computer Engineering from the University of Victoria, Canada in 2004. His research interests include ultra-wideband
radio systems, MIMO wireless systems, and spectrum communications. From 1994 to 1997, he was the Assistant President of ICO(China)
Global Communication Company. He was the Founder and CEO of Beijing Parco Co., Ltd. from 1998 to 2000. In 2000, he joined
Microsoft Canada as a Software Engineer, and was Chief Engineer at Dream Access Information Technology, Canada from 2001 to
2002. He is currently an Adjunct Assistant Professor in the Department of Electrical and Computer Engineering at the University
of Victoria.
T. Aaron Gulliver received the Ph.D. degree in Electrical and Computer Engineering from the University of Victoria, Victoria, BC, Canada in
1989. From 1989 to 1991 he was employed as a Defence Scientist at Defence Research Establishment Ottawa, Ottawa, ON, Canada.
He has held academic positions at Carleton University, Ottawa, and the University of Canterbury, Christchurch, New Zealand.
He joined the University of Victoria in 1999 and is a Professor in the Department of Electrical and Computer Engineering.
He is a Senior Member of the IEEE and a member of the Association of Professional Engineers of Ontario, Canada. In 2002, he
became a Fellow of the Engineering Institute of Canada. His research interests include information theory and communication
theory, algebraic coding theory, cryptography, construction of optimal codes, turbo codes, spread spectrum communications,
space-time coding and ultra wideband communications. 相似文献
2.
There is no theoretical time or frequency restrictions on capacity in DS-CDMA systems. In these systems, the signal to interference
ratio (SIR) has a major effect on capacity. Since an increase in the user SIR at the base station (BS) leads to higher capacity,
transmission power control is employed. The nonuniform distribution of users in the network causes different quality of service
(QOS) in distinct regions, therefore network resources may not be utilized properly. A dynamic distribution algorithm can
be employed to balance the QOS delivered in different regions of the network. In this paper, a novel dynamic distribution
algorithm is introduced. The proposed algorithm deactivates certain users when the network encounters an overload. By applying
this policy, the required SIR can be maintained for the remaining users.
F. Hendessi received a B.Sc. degree from Baluchestan University, Iran in 1986, and an M.Sc. degree from Isfahan University of Technology,
Iran in 1988, both in Electrical Engineering. In 1993 he received a Ph.D. in Electrical Engineering from Carleton University,
Ottawa, Ontario, Canada. He is currently an Assistant Professor in the Department of Electrical Engineering at Isfahan University
of Technology.
A. Ghayoori received B.Sc. and M.Sc. degrees in Electrical Engineering from Isfahan University of Technology, Isfahan, Iran, in 2001
and 2003, respectively. He is currently a Research Engineer with the ICT research center at IUT.
T. A. Gulliver received a Ph.D. degree in Electrical and Computer Engineering from the University of Victoria, Victoria, BC, Canada in 1989.
From 1989 to 1991 he was employed as a Defence Scientist at Defence Research Establishment Ottawa, Ottawa, ON, Canada. He
has held academic positions at Carleton University, Ottawa, and the University of Canterbury, Christchurch, New Zealand. He
joined the University of Victoria in 1999 and is a Professor in the Department of Electrical and Computer Engineering.
He is a Senior Member of the IEEE and a member of the Association of Professional Engineers of Ontario, Canada. In 2002, he
became a Fellow of the Engineering Institute of Canada. His research interests include information theory and communication
theory, algebraic coding theory, cryptography, construction of optimal codes, turbo codes, spread spectrum communications,
space-time coding and ultra wideband communications. 相似文献
3.
We propose an innovative resource management scheme for TDMA based mobile ad hoc networks. Since communications between some
important nodes in the network are more critical, they should be accepted by the network with high priority in terms of network
resource usage and quality of service (QoS) support. In this scheme, we design a location-aware bandwidth pre-reservation
mechanism, which takes advantage of each mobile node’s geographic location information to pre-reserve bandwidth for such high
priority connections and thus greatly reduces potential scheduling conflicts for transmissions. In addition, an end-to-end
bandwidth calculation and reservation algorithm is proposed to make use of the pre-reserved bandwidth. In this way, time slot
collisions among different connections and in adjacent wireless links along a connection can be reduced so that more high
priority connections can be accepted into the network without seriously hurting admissions of other connections. The salient
feature of our scheme is the collaboration between the routing and MAC layer that results in the more efficient spatial reuse
of limited resources, which demonstrates how cross-layer design leads to better performance in QoS support. Extensive simulations
show that our scheme can successfully provide better communication quality to important nodes at a relatively low price. Finally,
several design issues and future work are discussed.
Xiang Chen received the B.E. and M.E. degrees in electrical engineering from Shanghai Jiao Tong University, Shanghai, China, in 1997
and 2000, respectively. Afterwards, he worked as a MTS (member of technical staff) in Bell Laboratories, Beijing, China. He
is currently working toward the Ph.D. degree in the department of Electrical and Computer Engineering at the University of
Florida. His research is focused on protocol design and performance evaluation in wireless networks, including cellular networks,
wireless LANs, and mobile ad hoc networks. He is a member of Tau Beta Pi and a student member of IEEE.
Wei Liu received the BE and ME degrees in electrical engineering from Huazhong University of Science and Technology, Wuhan, China,
in 1998 and 2001, respectively. He is currently pursuing the P.hD. degree in the Department of Electrical and Computer Engineering,
University of Florida, Gainesville, where he is a research assistant in the Wireless Networks Laboratory (WINET). His research
interest includes QoS, secure and power efficient routing, and MAC protocols in mobile ad hoc networks and sensor networks.
He is a student member of the IEEE.
Hongqiang Zhai received the B.E. and M.E. degrees in electrical engineering from Tsinghua University, Beijing, China, in July 1999 and January
2002 respectively. He worked as a research intern in Bell Labs Research China from June 2001 to December 2001, and in Microsoft
Research Asia from January 2002 to July 2002. Currently he is pursuing the Ph.D. degree in the Department of Electrical and
Computer Engineering, University of Florida. He is a student member of IEEE.
Yuguang Fang received a Ph.D. degree in Systems and Control Engineering from Case Western Reserve University in January 1994, and a Ph.D.
degree in Electrical Engineering from Boston University in May 1997. From June 1997 to July 1998, he was a Visiting Assistant
Professor in Department of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was
an Assistant Professor in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology. In
May 2000, he joined the Department of Electrical and Computer Engineering at University of Florida where he got the early
promotion to Associate Professor with tenure in August 2003 and to Full Professor in August 2005. He has published over 180
papers in refereed professional journals and conferences. He received the National Science Foundation Faculty Early Career
Award in 2001 and the Office of Naval Research Young Investigator Award in 2002. He is currently serving as an Editor for
many journals including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEETransactions
on Mobile Computing, and ACM Wireless Networks. He is also actively participating in conference organization such as the Program
Vice-Chair for IEEE INFOCOM’2005, Program Co-Chair for the Global Internet and Next Generation Networks Symposium in IEEE
Globecom’2004 and the Program Vice Chair for 2000 IEEE Wireless Communications and Networking Conference (WCNC’2000). 相似文献
4.
Pejman Khadivi Shadrokh Samavi Hossein Saidi Terence D. Todd Dongmei Zhao 《Wireless Personal Communications》2006,39(4):515-542
Future mobile handsets will often be multi-mode, containing both wireless LAN (WLAN) and cellular air interfaces. When such a device is within a WLAN it can be served by the WLAN resources. As it moves out of the WLAN coverage area, it has to be served by the cellular system. Therefore, handoffs are necessary between the WLAN and the cellular system. In loosely coupled WLAN/Cellular systems the system administrator of the WLAN is different from the cellular one. Therefore, in these situations, reducing the dropping probability based on classical methods, such as using some reserved guard channels, is difficult. In this paper, we propose to use ad hoc relaying during the vertical handoff process in a hybrid WLAN/Cellular system. The method that we propose in this paper improves the dropping probability regardless of the number of reserved channels. Therefore, this method could be employed in loosely coupled hybrid systems. Both analytical reasoning and simulation results support the effectiveness of the proposed method.
Pejman Khadivi received the BS and MS degrees in computer engineering (Hardware and Computer Systems Architecture) in 1998 and 2000, respectively from Isfahan University of Technology, where he is currently working toward his Ph.D. During the 2003/2004 academic year, he was a Visiting Researcher with the Electrical and Computer Engineering Department, McMaster University, ON, Canada. Different aspects of computer architecture and networking are Mr. Khadivi’s research interests specially, adhoc networks, QoS routing and seamless handoff in hybrid mobile networks.
Shadrokh Samavi received the B.S. degrees in industrial technology and electrical engineering from the California State University, Fresno, in 1980 and 1982, respectively, the M.S. degree from the University of Memphis, Memphis, TN, in 1985, and the Ph.D. degree in electrical engineering from Mississippi State University, Mississippi State, in 1989. In 1995, he joined the Electrical and Computer Engineering Department, Isfahan University of Technology, Isfahan, Iran, where he was an Associative Professor. During the 2002/2003 academic year, he was a Visiting Professor with the Electrical and Computer Engineering Department, McMaster University, Hamilton, ON, Canada. His current research interests are implementation and optimization of image-processing algorithms and area-performance tradeoffs in computational circuits. Dr. Samavi is a Registered Professional Engineer (P.E.), USA, and is a member of Eta Kappa Nu, Tau Beta Pi, and the National Association of Industrial Technologists (NAIT).
Hossein Saidi received the B.S. and M.S. degrees in electrical engineering (Electronics and communication Eng.) from Isfahan University of Technology (IUT), in 1986 and 1989, respectively, and the Ph.D. degree in electrical engineering from the Washington University in St. Louis, MO. in 1994.From 1994 to 1995, he was a research associates at Washington Univ. St. Louis, and in 1995 he joined the Electrical and Computer Engineering of IUT, where he is an Associate Professor. His Research interest includes ATM, high speed networking, QoS guarantees, routing, algorithms and information theory.
Terence D. Todd received the B.A.Sc, M.A.Sc and Ph.D degrees in Electrical Engineering from the University of Waterloo, Waterloo, Ontario, Canada. While at Waterloo he spent 3 years as a Research Associate with the Computer Communications Networks Group (CCNG). He is currently a Professor of Electrical and Computer Engineering at McMaster University in Hamilton, Ontario, Canada.Professor Todd spent 1991 on research leave in the Distributed Systems Research Department at AT&T Bell Laboratories in Murray Hill, NJ. He also spent 1998 on research leave at The Olivetti and Oracle Research Laboratory in Cambridge, England. While at ORL he worked on the piconet project which was an early embedded wireless network testbed.Dr. Todd’s research interests include metropolitan/local area networks, wireless communications and the performance analysis of computer communication networks and systems. He currently holds the NSERC/RIM/CITO Industrial Research Chair on Pico-Cellular Wireless Internet Access Networks. Dr. Todd is a Professional Engineer in the province of Ontario and a member of the IEEE.
Dongmei Zhao received the Ph.D degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario, Canada in June 2002. Since July 2002 she has been with the Department of Electrical and Computer Engineering, McMaster University, Hamilton, Ontario, Canada where she is an assistant professor. Dr. Zhao’s research interests include modeling and performance analysis, quality-of-service provisioning, access control and admission control in wireless cellular networks and integrated cellular and ad hoc networks. Dr. Zhao is a member of the IEEE. 相似文献
5.
Yu Cheng Xinhua Ling Lin X. Cai Wei Song Weihua Zhuang Xuemin Shen Alberto Leon-Garcia 《Wireless Networks》2009,15(1):73-86
This paper presents an analytical model for evaluating the statistical multiplexing effect, admission region, and contention
window design in multiclass wireless local area networks (WLANs). We consider distributed medium access control (MAC) which
provisions service differentiation by assigning different contention windows to different classes. Mobile nodes belonging
to different classes may have heterogeneous traffic arrival processes with different quality of service (QoS) requirements.
With bursty input traffic, e.g. on/off sources, our analysis shows that the WLAN admission region under the QoS constraint
can be significantly improved, when the statistical multiplexing effect is taken into account. We also analyze the MAC resource
sharing between the short-range dependent (SRD) on/off sources and the long-range dependent (LRD) fractional Brownian motion
(FBM) traffic, where the impact of the Hurst parameter on the admission region is investigated. Moveover, we demonstrate that
the proper selection of contention windows plays an important role in improving the WLAN’s QoS capability, while the optimal
contention window for each class and the maximum admission region can be jointly solved in our analytical model. The analysis
accuracy and the resource utilization improvement from statistical multiplexing gain and contention window optimization are
demonstrated by extensive numerical results.
Yu Cheng received the B.E. and M.E. degrees in Electrical Engineering from Tsinghua University, Beijing, China, in 1995 and 1998,
respectively, and the Ph.D. degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario,
Canada, in 2003. From September 2004 to July 2006, he was a postdoctoral research fellow in the Department of Electrical and
Computer Engineering, University of Toronto, Ontario, Canada. Since August 2006, he has been with the Department of Electrical
and Computer Engineering, Illinois Institute of Technology, Chicago, Illinois, USA, as an Assistant Professor. His research
interests include service and application oriented networking, autonomic network management, Internet performance analysis,
resource allocation, wireless networks, and wireless/wireline interworking. He received a Postdoctoral Fellowship Award from
the Natural Sciences and Engineering Research Council of Canada (NSERC) in 2004.
Xinhua Ling received the B. Eng. degree in Radio Engineering from Southeast University, Nanjing, China in 1993 and the M. Eng. degree
in Electrical Engineering from the National University of Singapore, Singapore in 2001. He is currently pursuing the Ph.D.
degree in the Department of Electrical and Computer Engineering at the University of Waterloo, Ontario, Canada. From 1993
to 1998, he was an R&D Engineer in Beijing Institute of Radio Measurement, China. From February 2001 to September 2002, he
was with the Centre for Wireless Communications (currently Institute for Infocom Research), Singapore, as a Senior R&D Engineer,
developing the protocol stack for UE in the UMTS system. His general research interests are in the areas of cellular, WLAN,
WPAN, mesh and ad hoc networks and their internetworking, focusing on protocol design and performance analysis.
Lin X. Cai received the B.Sc. degree in computer science from Nanjing University of Science and Technology, Nanjing, China, in 1996
and the MASc. degree in electrical and computer engineering from the University of Waterloo, Waterloo, Canada, in 2005. She
is currently working toward the Ph.D. degree in the same field at the University of Waterloo. Her current research interests
include network performance analysis and protocol design for multimedia applications over wireless networks.
Wei Song received the B.S. degree in electrical engineering from Hebei University, China, in 1998 and the M.S. degree in computer
science from Beijing University of Posts and Telecommunications, China, in 2001. She is currently working toward the Ph.D.
degree at the Department of Electrical and Computer Engineering, University of Waterloo, Canada. Her current research interests
include resource allocation and quality-of-service (QoS) provisioning for the integrated cellular networks and wireless local
area networks (WLANs).
Weihua Zhuang received the Ph.D. degree in electrical engineering from the University of New Brunswick, Canada. Since October 1993, she
has been with the Department of Electrical and Computer Engineering, University of Waterloo, Canada, where she is a Professor.
Dr. Zhuang is a co-author of the textbook Wireless Communications and Networking (Prentice Hall, 2003). Her current research interests include multimedia wireless communications, wireless networks, and
radio positioning. She received the Outstanding Performance Award in 2005 and 2006 from the University of Waterloo and the
Premier’s Research Excellence Award in 2001 from the Ontario Government for demonstrated excellence of scientific and academic
contributions. She is the Editor-in-Chief of IEEE Transactions on Vehicular Technology and an Editor of IEEE Transactions on Wireless Communications.
Xuemin (Sherman) Shen received the B.Sc.(1982) degree from Dalian Maritime University (China) and the M.Sc. (1987) and Ph.D. degrees (1990) from
Rutgers University, New Jersey (USA), all in electrical engineering. He is a Professor and the Associate Chair for Graduate
Studies, Department of Electrical and Computer Engineering, University of Waterloo, Canada. His research focuses on mobility
and resource management in interconnected wireless/wired networks, UWB wireless communications systems, wireless security,
and ad hoc and sensor networks. He is a co-author of three books, and has published more than 300 papers and book chapters
in wireless communications and networks, control and filtering. Dr. Shen serves as the Technical Program Committee Chair for
IEEE Globecom’07, General Co-Chair for Chinacom’07 and QShine’06, the Founding Chair for IEEE Communications Society Technical
Committee on P2P Communications and Networking. He also serves as a Founding Area Editor for IEEE Transactions on Wireless Communications; Associate Editor for IEEE Transactions on Vehicular Technology; KICS/IEEE Journal of Communications and Networks; Computer Networks (Elsevier); ACM/Wireless Networks; and Wireless Communications and Mobile Computing (John Wiley), etc. He has also served as Guest Editor for IEEE JSAC, IEEE Wireless Communications, and IEEE Communications Magazine. Dr. Shen received the Excellent Graduate Supervision Award in 2006, and the Outstanding Performance Award in 2004 from the
University of Waterloo, the Premier’s Research Excellence Award in 2003 from the Province of Ontario, Canada, and the Distinguished
Performance Award in 2002 from the Faculty of Engineering, University of Waterloo. Dr. Shen is a registered Professional Engineer
of Ontario, Canada.
Alberto Leon-Garcia received the B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Southern California, in 1973,
1974, and 1976 respectively. He is a Full Professor in the Department of Electrical and Computer Engineering, University of
Toronto, ON, Canada, and he currently holds the Nortel Institute Chair in Network Architecture and Services. In 1999 he became
an IEEE fellow for “For contributions to multiplexing and switching of integrated services traffic”.
Dr. Leon-Garcia was Editor for Voice/Data Networks for the
IEEE Transactions on Communications from 1983 to 1988 and Editor for the IEEE Information Theory Newsletter from 1982 to 1984. He was Guest Editor of the September 1986 Special Issue on Performance Evaluation of Communications Networks
of the IEEE Selected Areas on Communications. He is also author of the textbooks Probability and Random Processes for Electrical Engineering (Reading, MA: Addison-Wesley), and Communication Networks: Fundamental Concepts and Key Architectures (McGraw-Hill), co-authored with Dr. Indra Widjaja. 相似文献
6.
Energy use is a crucial design concern in wireless ad hoc networks since wireless terminals are typically battery-operated.
The design objectives of energy-aware routing are two folds: Selecting energy-efficient paths and minimizing the protocol
overhead incurred for acquiring such paths. To achieve these goals simultaneously, we present the design of several on-demand
energy-aware routing protocols. The key idea behind our design is to adaptively select the subset of nodes that are required
to involve in a route-searching process in order to acquire a high residual-energy path and/or the degree to which nodes are
required to participate in the process of searching for a low-power path in networks wherein nodes have transmission power
adjusting capability. Analytical and simulation results are given to demonstrate the high performance of the designed protocols
in energy-efficient utilization as well as in reducing the protocol overhead incurred in acquiring energy-efficient routes.
Baoxian Zhang received his B.S., M.S., and Ph.D. degrees in Electrical Engineering from Northern Jiaotong University, Beijing, China in
1994, 1997, and 2000, respectively. From January 2001 to August 2002, he was working with Department of Electrical and Computer
Engineering at Queen’s University in Kingston as a postdoctoral fellow. He is currently a research scientist with the School
of Information Technology and Engineering (SITE) of University of Ottawa in Ottawa, Ontario, Canada. He has published over
40 refereed technical papers in international journals and conference proceedings. His research interests include routing
algorithm and protocol design, QoS management, wireless ad hoc and sensor networks, survivable optical networks, multicast
communications, and performance evaluation. He is a member of the IEEE.
Hussein Mouftah joined the School of Information Technology and Engineering (SITE) of the University of Ottawa in September 2002 as a Canada
Research Chair (Tier 1) Professor in Optical Networks. He has been with the Department of Electrical and Computer Engineering
at Queen’s University (1979-2002), where he was prior to his departure a Full Professor and the Department Associate Head.
He has three years of industrial experience mainly at Bell Northern Research of Ottawa, now Nortel Networks (1977-79). He
has spent three sabbatical years also at Nortel Networks (1986-87, 1993-94, and 2000-01), always conducting research in the
area of broadband packet switching networks, mobile wireless networks and quality of service over the optical Internet. He
served as Editor-in-Chief of the IEEE Communications Magazine (1995-97) and IEEE Communications Society Director of Magazines
(1998-99) and Chair of the Awards Committee (2002-2003). He is a Distinguished Speaker of the IEEE Communications Society
since 2000.
Dr. Mouftah is the author or coauthor of five books, 22 book chapters and more than 700 technical papers and 8 patents in
this area. He is the recipient of the 1989 Engineering Medal for Research and Development of the Association of Professional
Engineers of Ontario (PEO), and the Ontario Distinguished Researcher Award of the Ontario Innovation Trust. He is the joint
holder of the Best Paper Award for a paper presented at SPECTS’2002, and the Outstanding Paper Award for papers presented
at the IEEE HPSR’2002 and the IEEE ISMVL’1985. Also he is the joint holder of a Honorable Mention for the Frederick W. Ellersick
Price Paper Award for Best Paper in the IEEE Communications Magazine in 1993. He is the recipient of the IEEE Canada (Region
7) Outstanding Service Award (1995). Also he is the recipient of the 2004 IEEE Communications Society Edwin Howard Armstrong
Achievement Award, and the 2004 George S. Glinski Award for Excellence in Research of the Faculty of Engineering, University
of Ottawa. Dr. Mouftah is a Fellow of the IEEE (1990) and Fellow of the Canadian Academy of Engineering (2003). 相似文献
7.
Quality of service (QoS) support for multimedia services in the IEEE 802.11 wireless LAN is an important issue for such WLANs
to become a viable wireless access to the Internet. In this paper, we endeavor to propose a practical scheme to achieve this
goal without changing the channel access mechanism. To this end, a novel call admission and rate control (CARC) scheme is
proposed. The key idea of this scheme is to regulate the arriving traffic of the WLAN such that the network can work at an
optimal point. We first show that the channel busyness ratio is a good indicator of the network status in the sense that it
is easy to obtain and can accurately and timely represent channel utilization. Then we propose two algorithms based on the
channel busyness ratio. The call admission control algorithm is used to regulate the admission of real-time or streaming traffic
and the rate control algorithm to control the transmission rate of best effort traffic. As a result, the real-time or streaming
traffic is supported with statistical QoS guarantees and the best effort traffic can fully utilize the residual channel capacity
left by the real-time and streaming traffic. In addition, the rate control algorithm itself provides a solution that could
be used above the media access mechanism to approach the maximal theoretical channel utilization. A comprehensive simulation
study in ns-2 has verified the performance of our proposed CARC scheme, showing that the original 802.11 DCF protocol can
statically support strict QoS requirements, such as those required by voice over IP or streaming video, and at the same time,
achieve a high channel utilization.
Hongqiang Zhai received the B.E. and M.E. degrees in electrical engineering from Tsinghua University, Beijing, China, in July 1999 and January
2002 respectively. He worked as a research intern in Bell Labs Research China from June 2001 to December 2001, and in Microsoft
Research Asia from January 2002 to July 2002. Currently he is pursuing the PhD degree in the Department of Electrical and
Computer Engineering, University of Florida. He is a student member of IEEE.
Xiang Chen received the B.E. and M.E. degrees in electrical engineering from Shanghai Jiao Tong University, Shanghai, China, in 1997
and 2000, respectively, and the Ph.D. degree in electrical and computer engineering from the University of Florida, Gainesville,
in 2005. He is currently a Senior Research Engineer at Motorola Labs, Arlington Heights, IL. His research interests include
resource management, medium access control, and quality of service (QoS) in wireless networks. He is a Member of Tau Beta
Pi and a student member of IEEE.
Yuguang Fang received a Ph.D degree in Systems and Control Engineering from Case Western Reserve University in January 1994, and a Ph.D
degree in Electrical Engineering from Boston University in May 1997.
From June 1997 to July 1998, he was a Visiting Assistant Professor in Department of Electrical Engineering at the University
of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor in the Department of Electrical and Computer
Engineering at New Jersey Institute of Technology. In May 2000, he joined the Department of Electrical and Computer Engineering
at University of Florida where he got the early promotion with tenure in August 2003 and has been an Associate Professor since
then. He has published over one hundred (100) papers in refereed professional journals and conferences. He received the National
Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research Young Investigator Award in 2002.
He is currently serving as an Editor for many journals including IEEE Transactions on Communications, IEEE Transactions on
Wireless Communications, IEEE Transactions on Mobile Computing, and ACM Wireless Networks. He is also actively participating
in conference organization such as the Program Vice-Chair for IEEE INFOCOM’2005, Program Co-Chair for the Global Internet
and Next Generation Networks Symposium in IEEE Globecom’2004 and the Program Vice Chair for 2000 IEEE Wireless Communications
and Networking Conference (WCNC’2000). 相似文献
8.
This paper studies packet transmission scheduling for real-time constant-bit-rate (CBR) traffic in IEEE 802.16-based wireless
mesh networks. We first formulate and solve the scheduling problem as a binary linear programming problem. The computational
complexity of the optimum scheduling solution may prevent it from being implemented in practice. We then propose a heuristic
scheme, namely bottleneck first scheduling scheme, where scheduling decisions at stations (base station or subscriber stations)
with higher traffic loads are done before those at stations with lower traffic loads. At each station, scheduling decisions
for CBR packets with more hops to their destinations are done first. Numerical results show that the proposed scheduling scheme
achieves the same capacity as the optimal one while obtaining satisfactory delay performance.
Dongmei Zhao received the Ph.D. degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario, Canada
in June 2002. Since July 2002 she has been with the Department of Electrical and Computer Engineering, McMaster University,
Hamilton, Ontario, Canada where she is an assistant professor. Dr. Zhao’s research interests include modeling and performance
analysis, quality-of-service provisioning, access control and admission control in wireless networks. Dr. Zhao is a member
of the IEEE and a registered Professional Engineer of Ontario.
Jun Zou received the B.S. and M. Eng. Degrees from Tianjin University, China in 1999 and 2002, respectively. He worked at Siemens
Communication Networks Ltd., Beijing from 2002 to 2004. Currently, he is a Ph.D. student at McMaster University, Canada. His
research interests include wireless networking, routing protocols, architecture of next generation networks, network security
and their applications in telecommunication industry. 相似文献
9.
Sensor nodes are densely deployed to accomplish various applications because of the inexpensive cost and small size. Depending
on different applications, the traffic in the wireless sensor networks may be mixed with time-sensitive packets and reliability-demanding
packets. Therefore, QoS routing is an important issue in wireless sensor networks. Our goal is to provide soft-QoS to different
packets as path information is not readily available in wireless networks. In this paper, we utilize the multiple paths between
the source and sink pairs for QoS provisioning. Unlike E2E QoS schemes, soft-QoS mapped into links on a path is provided based
on local link state information. By the estimation and approximation of path quality, traditional NP-complete QoS problem
can be transformed to a modest problem. The idea is to formulate the optimization problem as a probabilistic programming,
then based on some approximation technique, we convert it into a deterministic linear programming, which is much easier and
convenient to solve. More importantly, the resulting solution is also one to the original probabilistic programming. Simulation
results demonstrate the effectiveness of our approach.
This work was supported in part by the U.S. National Science Foundation under grant DBI-0529012, the National Science Foundation
Faculty Early Career Development Award under grant ANI-0093241 and the Office of Naval Research under Young Investigator Award
N000140210464.
Xiaoxia Huang received her BS and MS in the Electrical Engineering from Huazhong University of Science and Technology in 2000 and 2002,
respectively. She is completing her Ph.D. degree in the Department of Electrical and Computer Engineering at the University
of Florida. Her research interests include mobile computing, QoS and routing in wireless ad hoc networks and wireless sensor
networks.
Yuguang Fang received a Ph.D. degree in Systems Engineering from Case Western Reserve University in January 1994 and a Ph.D degree in
Electrical Engineering from Boston University in May 1997. He was an assistant professor in the Department of Electrical and
Computer Engineering at New Jersey Institute of Technology from July 1998 to May 2000. He then joined the Department of Electrical
and Computer Engineering at University of Florida in May 2000 as an assistant professor, got an early promotion to an associate
professor with tenure in August 2003 and to a full professor in August 2005. He holds a University of Florida Research Foundation
(UFRF) Professorship from 2006 to 2009. He has published over 200 papers in refereed professional journals and conferences.
He received the National Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research Young Investigator
Award in 2002. He has served on several editorial boards of technical journals including IEEE Transactions on Communications,
IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing and ACM Wireless Networks. He have also
been activitely participating in professional conference organizations such as serving as The Steering Committee Co-Chair
for QShine, the Technical Program Vice-Chair for IEEE INFOCOM’2005, Technical Program Symposium Co-Chair for IEEE Globecom’2004,
and a member of Technical Program Committee for IEEE INFOCOM (1998, 2000, 2003–2007). 相似文献
10.
An efficient radio resource allocation scheme is crucial for guaranteeing the quality of service (QoS) requirements and fully
utilizing the scarce radio resources in wireless mobile networks. Most of previous studies of radio resource allocation in
traditional wireless networks concentrates on network layer connection blocking probability QoS. In this paper, we show that
physical layer techniques and QoS have significant impacts on network layer QoS. We use a concept of cross-layer effective
bandwidth to measure the unified radio resource usage taking into account both physical layer linear minimum-mean square error
(LMMSE) receivers and varying statistical characteristics of the packet traffic in code devision multiple access (CDMA) networks.
We demonstrate the similarity between traditional circuit-switched networks and packet CDMA networks, which enables rich theories
developed in traditional wireless mobile networks to be used in packet CDMA networks. Moreover, since both physical layer
signal-to-interference ratio (SIR) QoS and network layer connection blocking probability QoS are considered simultaneously,
we can explore the tradeoff between physical layer QoS and network layer QoS in packet CDMA networks.
This work is supported by Natural Science and Engineering Research Council of Canada. Please address all correspondence to
Professor Vikram Krishnamurthy at the above address.
Fei Yu received the Ph.D. degree in electrical engineering from the University of British Columbia in 2003. From 2002 to 2004, he
was with Ericsson (in Lund, Sweden), where he worked on the research and development of dual mode UMTS/GPRS handsets. From
2005, he has been working in Silicon Valley at a start-up, where he conducts research and development in the areas of advanced
wireless communication technologies and new standards. After completing the PhD, he has been a research associate in the Department
of Electrical and Computer Engineering at the University of British Columbia. His research interests include cross-layer optimization,
QoS provisioning and security in wireless networks.
Vikram Krishnamurthy (S’90-M’91-SM’99-F’05) was born in 1966. He received his bachelor’s degree from the University of Auckland, New Zealand in
1988, and Ph.D. from the Australian National University, Canberra, in 1992. Since 2002, he has been a professor and Canada
Research Chair at the Department of Electrical Engineering, University of British Columbia, Vancouver, Canada. Prior to this
he was a chaired professor at the Department of Electrical and Electronic Engineering, University of Melbourne, Australia.
His research interests span several areas including ion channels and nanobiology, stochastic scheduling and control, statistical
signal processing and wireless telecommunications. Dr. Krishnamurthy has served as associate editor for IEEE Transactions on Signal Processing, IEEE Transactions Aerospace and Electronic Systems, IEEE Transactions Nanobioscience, IEEE Transactions Circuits and Systems II, Systems and Control Letters and European Journal of Applied Signal Processing. He was guest editor of a special issue of IEEE Transactions on NanoBioScience, March 2005 on bio-nanotubes. 相似文献
11.
Efficient QoS Provisioning for Adaptive Multimedia in Mobile Communication Networks by Reinforcement Learning 总被引:1,自引:0,他引:1
The scarcity and large fluctuations of link bandwidth in wireless networks have motivated the development of adaptive multimedia
services in mobile communication networks, where it is possible to increase or decrease the bandwidth of individual ongoing
flows. This paper studies the issues of quality of service (QoS) provisioning in such systems. In particular, call admission
control and bandwidth adaptation are formulated as a constrained Markov decision problem. The rapid growth in the number of
states and the difficulty in estimating state transition probabilities in practical systems make it very difficult to employ
classical methods to find the optimal policy. We present a novel approach that uses a form of discounted reward reinforcement
learning known as Q-learning to solve QoS provisioning for wireless adaptive multimedia. Q-learning does not require the explicit state transition model to solve the Markov decision problem; therefore more general
and realistic assumptions can be applied to the underlying system model for this approach than in previous schemes. Moreover,
the proposed scheme can efficiently handle the large state space and action set of the wireless adaptive multimedia QoS provisioning
problem. Handoff dropping probability and average allocated bandwidth are considered as QoS constraints in our model and can
be guaranteed simultaneously. Simulation results demonstrate the effectiveness of the proposed scheme in adaptive multimedia
mobile communication networks.
This work is based in part on a paper presented at BroadNet's 04, San Jose, CA, Oct. 2004.
Fei Yu received the M.S. degree in Computer Engineering from Beijing University of Posts and Telecommunications, P.R. China, in
1998, and the Ph.D. degree in Electrical Engineering from the University of British Columbia (UBC), Canada, in 2003. From
1998 to 1999, Dr. Yu was a system engineer at China Telecom, P.R. China, working on the planning, design and performance analysis
of national SS7 and GSM networks. From 2002 to 2004, He was a research and development engineer at Ericsson Mobile Platforms,
Sweden, where he worked on dual-mode UMTS/GPRS handsets. He is currently a postdoctoral research fellow at UBC. His research
interests are quality of service, cross-layer design and mobility management in wireless networks.
Vincent W.S. Wong (S'94-M'00) received the B.Sc. (with distinction) degree from the University of Manitoba, Winnipeg, MB, Canada, in 1994,
the M.A.Sc. degree from the University of Waterloo, Waterloo, ON, Canada, in 1996, and the Ph.D. degree from the University
of British Columbia (UBC), Vancouver, BC, Canada, in 2000, all in electrical engineering. From 2000 to 2001, he was a Systems
Engineer at PMC-Sierra, Inc., Burnaby, BC. Since 2002, he has been with the Department of Electrical and Computer Engineering,
UBC, where he is currently an Assistant Professor. His research interests are in wireless communications and networking. Dr.
Wong received the Natural Science and Engineering Research Council (NSERC) postgraduate scholarship and the Fessenden Postgraduate
Scholarship from Communications Research Centre, Industry Canada, during his graduate studies.
Victor C.M. Leung received the B.A.Sc. (Hons.) degree in electrical engineering from the University of British Columbia (U.B.C.) in 1977, and
was awarded the APEBC Gold Medal as the head of the graduating class in the Faculty of Applied Science. He attended graduate
school at U.B.C. on a Natural Sciences and Engineering Research Council Postgraduate Scholarship and obtained the Ph.D. degree
in electrical engineering in 1981.
From 1981 to 1987, Dr. Leung was a Senior Member of Technical Staff at Microtel Pacific Research Ltd. (later renamed MPR Teltech
Ltd.), specializing in the planning, design and analysis of satellite communication systems. He also held a part-time position
as Visiting Assistant Professor at Simon Fraser University in 1986 and 1987. In 1988, he was a Lecturer in the Department
of Electronics at the Chinese University of Hong Kong. He joined the Department of Electrical Engineering at U.B.C. in 1989,
where he is a Professor, Associate Head of Graduate Affairs, holder of the TELUS Mobility Industrial Research Chair in Advanced
Telecommunications Engineering, and a member of the Institute for Computing, Information and Cognitive Systems. His research
interests are in the areas of architectural and protocol design and performance analysis for computer and telecommunication
networks, with applications in satellite, mobile, personal communications and high speed networks.
Dr. Leung is a Fellow of IEEE and a voting member of ACM. He is an editor of the IEEE Transactions on Wireless Communications,
and an associate editor of the IEEE Transactions on Vehicular Technology. He has served on the technical program committees
of numerous conferences, and is serving as the Technical Program Vice-Chair of IEEE WCNC 2005. 相似文献
12.
In this paper we study connection admission control (CAC) in IEEE 802.11-based ESS mesh networks. An analytical model is developed
for studying the effects of CAC on mesh network capacity. A distributed CAC scheme is proposed, which incorporates load balancing
when selecting a mesh path for new connections. Our results show that connection level performance, including both average
number of connections and connection blocking probability, can be greatly improved using the proposed mechanism compared to
other admission control schemes.
Dongmei Zhao received the Ph.D. degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario, Canada
in June 2002. Since July 2002 she has been with the Department of Electrical and Computer Engineering, McMaster University,
Hamilton, Ontario, Canada where she is an assistant professor. Dr. Zhao’s research interests include modeling and performance
analysis, quality-of-service provisioning, access control and admission control in wireless networks. Dr. Zhao is a member
of the IEEE.
Jun Zou received his B. Eng. and M. Eng. Degrees from Tianjin University, China in 1999 and 2002, respectively. He worked at Siemens
Communication Networks Ltd., Beijing from 2002 to 2004. Currently, he is a PhD. student at McMaster University, Canada. His
research interests include wireless networking, routing protocols, architecture of next generation networks and network security.
Terence D. Todd received the B.A.Sc., M.A.Sc. and Ph.D. degrees in Electrical Engineering from the University of Waterloo, Waterloo, Ontario,
Canada. While at Waterloo Dr. Todd spent 3 years as a Research Associate with the Computer Communications Networks Group (CCNG).
He is currently a Professor of Electrical and Computer Engineering at McMaster University in Hamilton, Ontario, Canada. At
McMaster he has been the Principal Investigator on a number of projects in the optical networks and wireless networking areas.
Professor Todd spent 1991 on research leave in the Distributed Systems Research Department at AT&T Bell Laboratories in Murray
Hill, NJ. He also spent January-December 1998 on research leave at The Olivetti and Oracle Research Laboratory in Cambridge,
England. While at ORL he worked on the piconet project which was an early embedded wireless network testbed. Dr. Todd’s research
interests include metropolitan/local area networks, wireless communications and the performance analysis of computer communication
networks and systems. Dr. Todd is a past Editor of the IEEE/ACM Transactions on Networking and currently holds the NSERC/RIM/CITO
Chair on Pico-Cellular Wireless Internet Access Networks
Dr. Todd is a Professional Engineer in the province of Ontario and a member of the IEEE. 相似文献
13.
This paper presents a new low-voltage fully differential CMOS current-mode preamplifier for GBps data communications. The
number of transistors between the power and ground rails is only two so that the minimum supply voltage is one threshold voltage
plus one pinch-off voltage. The preamplifier is a balanced two-stage configuration such that the effect of bias-dependent
mismatches is minimized. A new inductive series-peaking technique is introduced to increase the bandwidth by utilizing the
resonance characteristics of LC networks. In addition, a new negative differential current feedback technique is proposed
to boost the bandwidth and to reduce the value of peaking inductors. The preamplifier has been implemented in TSMC 0.18 μm,
1.8 V, 6-metal mixed-mode CMOS technology and analyzed using Spectre from Cadence Design Systems with BSIM3v3 device models.
For an optical front-end with a 0.3 pF photodiode capacitance, simulation results demonstrate that the preamplifier has bandwidth
of 3.5 GHz and provides a transimpedance gain of 66 dBΩ. The total chip area is approximately 1 mm2 and the DC power consumption is about 85 mW.
Bendong Sun received the B.Eng. degree in electrical engineering from Shanghai Jiaotong University, Shanghai, China, in1992, and the
MASc degree in electrical and computer engineering from Ryerson University, Toronto, Ontario, Canada, in 2003. He is currently
working towards the Ph.D. degree in electrical and computer engineering at University of Waterloo, Waterloo, Ontario, Canada.
During 1992 through 1998 he was a Design Engineer at China Electronics Engineering Design Institute, Beijing, China. From
1998 to 2000 he worked for Bently Nevada Corporation, a GE Power Systems business, as a System Engineer. Since 2001, he has
been a Research Assistant with the System-on-Chip Laboratory at Ryerson University. His research interests include design
of analog and mixed-signal integrated circuits for high-speed data communications.
Fei Yuan received the B.Eng. degree in electrical engineering from Shandong University, Jinan, China in 1985, the MASc degree in chemical
engineering and PhD degree in electrical engineering from University of Waterloo, Waterloo, Ontario, Canada in 1995 and 1999,
respectively.
During 1985–1989, he was a Lecturer in the Department of Electrical Engineering, Changzhou Institute of Technology, Jiangsu,
China. In 1989 he was a Visiting Professor at Humber College of Applied Arts and Technology, Toronto, Canada. During 1989–1994,
he worked for Paton Controls Limited, Sarnia, Ontario, Canada as a Controls Engineer. Since July 1999 he has been with the
Department of Electrical and Computer Engineering, Ryerson University, Toronto, Ontario, Canada, where he is currently an
Associate Professor and the Associate Chair for Undergraduate Studies and Faculty Affairs. He is the co-author of the book
“Computer Methods for Analysis of Mixed-Mode Switching Circuits” (Kluwer Academic Publishers, 2004, with Ajoy Opal). Dr. Yuan
received an “Excellence of Teaching" award from Changzhou Institute of Technology in 1988, a post-graduate scholarship from
Natural Science and Engineering Research Council (NSERC) of Canada during 1997–1998. He is a senior member of IEEE and a registered
professional engineer in the province of Ontario, Canada.
Ajoy Opal (S'86-M'88) received the B. Tech degree from Indian Institute of Technology, New Delhi, India in 1981, and the MASc and PhD
degrees from University of Waterloo, Waterloo, Ontario, Canada in 1984 and 1987, respectively. During 1989–92 he worked for
Bell-Northern Research in the area of analog circuit simulation. He joined the Department of Electrical and Computer Engineering,
University of Waterloo in 1992 and currently a Full Professor. Dr. Opal works in the area of simulation of analog and mixed
digital-analog circuits, such as, switched capacitor, switched current, oversampled sigma-delta modulators. Other interests
include circuit theory and filter design. 相似文献
14.
The convergence of heterogeneous wireless access technologies has been envisioned to characterize the next generation wireless
networks. In such converged systems, the seamless and efficient handoff between different access technologies (vertical handoff)
is essential and remains a challenging problem. The heterogeneous co-existence of access technologies with largely different
characteristics results in handoff asymmetry that differs from the traditional intra-network handoff (horizontal handoff)
problem. In the case where one network is preferred, the vertical handoff decision should be carefully executed, based on
the wireless channel state, network layer characteristics, as well as application requirements. In this paper, we study the
performance of vertical handoff using the integration of 3G cellular and wireless local area networks as an example. In particular,
we investigate the effect of an application-based signal strength threshold on an adaptive preferred-network lifetime-based
handoff strategy, in terms of the signalling load, available bandwidth, and packet delay for an inter-network roaming mobile.
We present an analytical framework to evaluate the converged system performance, which is validated by computer simulation.
We show how the proposed analytical model can be used to provide design guidelines for the optimization of vertical handoff
in the next generation integrated wireless networks.
This article is the extended version of a paper presented in IFIP Networking 2005
Ahmed H. Zahran is a Ph.D. candidate at the Department of Electrical and Computer Engineering, University of Toronto. He received both his
M.Sc. and B.Sc. in Electrical Engineering from Electronics and Electrical Communication Department in the Faculty of Engineering,
Cairo University in 2002 and 2000 respectively, where he was holding teaching and research positions. Since September 2003,
he has been working as a research assistant in the Department of Electrical and Computer Engineering, University of Toronto
under the supervision of Professor Ben Liang. His research interest is wireless communication and networking with an emphasis
on the design and analysis of networking protocols and algorithms.
Ben Liang received honors simultaneous B.Sc. (valedictorian) and M.Sc. degrees in Electrical Engineering from Polytechnic University
in Brooklyn, New York, in 1997 and the PhD degree in Electrical Engineering with Computer Science minor from Cornell University
in Ithaca, New York, in 2001. In the 2001–2002 academic year, he was a visiting lecturer and post-doctoral research associate
at Cornell University. He joined the Department of Electrical and Computer Engineering at the University of Toronto as an
Assistant Professor in 2002. His current research interests are in the areas of mobile networking and wireless multimedia
systems. He is a member of Tau Beta Pi, IEEE, and ACM and serves on the organization and technical program committees of a
number of major conferences each year.
Aladdin Saleh earned his Ph.D. degree in Electrical Engineering from London University, England. Since March 1998, Dr. Saleh has been working
in the Wireless Technology Department of Bell Canada, the largest service provider of wireless, wire-line, and Internet in
Canada. He worked as a senior application architect in the wireless data group working on several projects among them the
wireless application protocol (WAP) and the location-based services. Later, he led the work on several key projects in the
broadband wireless network access planning group including planning of the IEEE 802.16/ Wimax, the IEEE 802.11/ WiFi, and
the integration of these technologies with the 3G cellular network including Mobile IP (MIP) deployment. Dr. Saleh also holds
the position of Adjunct Full Professor at the Department of Electrical and Computer Engineering of Waterloo University, Canada
since January 2004. He is currently conducting several joint research projects with the University of Waterloo and the University
of Toronto on IEEE 802.16-Wimax, MIMO technology, interworking of IEEE 802.11 WLAN and 3G cellular networks, and next generation
wireless networks. Prior to joining Bell Canada, Dr. Saleh worked as a faculty member at different universities and was Dean
and Chairman of Department for several years. Dr. Saleh is a Fellow of IEE and a Senior Member of IEEE. 相似文献
15.
Francisco M. Delicado Pedro Cuenca Luis Orozco-Barbosa Antonio Garrido 《Wireless Personal Communications》2005,34(1-2):67-90
Recent advances on wireless technology are enabling the design and deployment of multiservice wireless networks. In order
to be able to meet the QoS requirements of the various applications, it is essential to deploy QoS provisioning mechanisms.
In this paper, we present a QoS framework to support various types of services in a wireless networking environment. Under
this QoS framework, we propose various resource request mechanisms. We carry out a comparative study of the proposed schemes.
Our simulation results show the effectiveness of the mechanisms when supporting different services, such as video, voice,
best-effort and background traffic.
Francisco M. Delicado This author received his M.Sc. degree in Physics (Electronics and Computer Science) from the University Complutense of Madrid,
Madrid, Spain in 1995. He is currently a Ph.D. degree student in the Department of Computer Engineering at the University
of Castilla-La Mancha. His research interests include high-performance networks, specially wireless LAN, QoS over WLAN, video
compression, video transmission and error-resilient protocol architectures.
Pedro Cuenca This author received his M.Sc. degree in Physics (Electronics and Computer Science, award extraordinary) from the University
of Valencia in 1994. He got his Ph.D. degree in Computer Engineering in 1999 from the Polytechnic University of Valencia,
Spain. In 1995 he joined the Department de Computer Engineering at the University of Castilla-La Mancha. He is currently an
Associate Professor of Communications and Computer Networks. He has also been a visiting researcher at The Nottingham Trent
University, Nottingham (England) and at the Multimedia Communications Research Laboratory, University of Ottawa (Canada).
His research topics are centered in the area of high-performance networks, wireless LAN, video compression, QoS video transmission
and error-resilient protocol architectures. He has served in the organization of International Conferences as Session Chair.
He has been reviewer for several Journals and for several International Conferences. He is a member of the IFIP 6.8 Working
Group and a member of the IEEE.
Luis Orozco-Barbosa This author received the B.Sc. degree in electrical and computer engineering from Universidad Autonoma Metropolitana, Mexico,
in 1979, the Diplome d'Etudes Approfondies from ENSIMAG, France, in 1984 and the Doctorat de l'Universite from Universite
Pierre et Marie Curie, France, in 1987, both in computer science. From 1991 to 2002, he was a Faculty Member of Computer Engineering
at the School of Information Technology and Engineering (SITE), University of Ottawa, Canada. In 2002, he joined the Department
of Computer Engineering at Universidad de Castilla La Mancha (SPAIN) where he is currently Director of the Albacete Research
Institute of Informatics. He has published over 180 papers in international Journals and Conferences on computer networks
and performance evaluation. His current research interests include Internet protocols, video communications, wireless networks,
traffic modeling and performance evaluation. He is a member of the IEEE.
Antonio Garrido This author received the degree in physics (electronics and computer science) and the Ph.D. degrees from the University of
Granada, Spain, in 1986 and University of Valencia, Spain, in 1991, respectively. In 1986, he joined the Department of Computer
Engineering at the University of Castilla-La Mancha, where he is currently a Full Professor of Computer Architecture and Technology
and Dean of the EscuelaPolitecnica Superior de Albacete (School of Computer Engineering). His research interests include high-performance
networks, telemedicine, video compression, and video transmission. He has published over 40 papers in international journals
conferences on performance evaluation of parallel computer and communications systems and compression and transmission in
high-speed networks. He has led several research projects in telemedicine, computer networks and advanced computer system
architectures. 相似文献
16.
An important objective of next-generation wireless networks is to provide quality of service (QoS) guarantees. This requires
a simple and efficient wireless channel model that can easily translate into connection-level QoS measures such as data rate,
delay and delay-violation probability. To achieve this, in Wu and Negi (IEEE Trans. on Wireless Communications 2(4) (2003)
630–643), we developed a link-layer channel model termed effective capacity, for the setting of a single hop, constant-bit-rate arrivals, fluid traffic, and wireless channels with negligible propagation
delay. In this paper, we apply the effective capacity technique to deriving QoS measures for more general situations, namely,
(1) networks with multiple wireless links, (2) variable-bit-rate sources, (3) packetized traffic, and (4) wireless channels
with non-negligible propagation delay.
Dapeng Wu received B.E. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1990, M.E. in
Electrical Engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1997, and Ph.D. in Electrical
and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003. From July 1997 to December 1999, he conducted
graduate research at Polytechnic University, Brooklyn, New York. During the summers of 1998, 1999 and 2000, he conducted research
at Fujitsu Laboratories of America, Sunnyvale, California, on architectures and traffic management algorithms in the Internet
and wireless networks for multimedia applications.
Since August 2003, he has been with Electrical and Computer Engineering Department at University of Florida, Gainesville,
FL, as an Assistant Professor. His research interests are in the areas of networking, communications, multimedia, signal processing,
and information and network security. He received the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best
Paper Award for Year 2001.
Currently, he is an Associate Editor for the IEEE Transactions on Vehicular Technology and Associate Editor for International
Journal of Ad Hoc and Ubiquitous Computing. He served as Program Chair for IEEE/ACM First International Workshop on Broadband
Wireless Services and Applications (BroadWISE 2004); and as TPC member of over 20 conferences such as IEEE INFOCOM'05, IEEE
ICC'05, IEEE WCNC'05, and IEEE Globecom'04. He is Vice Chair of Mobile and wireless multimedia Interest Group (MobIG), Technical
Committee on Multimedia Communications, IEEE Communications Society. He is a member of the Award Committee, Technical Committee
on Multimedia Communications, IEEE Communications Society. He is also Director of Communications, IEEE Gainesville Section.
Rohit Negi received the B.Tech. degree in Electrical Engineering from the Indian Institute of Technology, Bombay, India in 1995. He
received the M.S. and Ph.D. degrees from Stanford University, CA, USA, in 1996 and 2000 respectively, both in Electrical Engineering.
He has received the President of India Gold medal in 1995.
Since 2000, he has been with the Electrical and Computer Engineering department at Carnegie Mellon University, Pittsburgh,
PA, USA, where he is an Assistant Professor. His research interests include signal processing, coding for communications systems,
information theory, networking, cross-layer optimization and sensor networks. 相似文献
17.
This paper extends the timing test model in [5] to be more realistic by including the effects of the test fixtures between
a device under test and a tester. The paper enables analyzing the trade-offs that arise between the predicted yield and the
required overall test environment timing accuracy (OTETA) which involves the tester overall timing accuracy (OTA) and the
test fixtures' impacts. We specifically focus on the application of the extended model to predict the test yield of standard
high-speed interconnects, such as PCI Express, Parallel/Serial RapidIO, and HyperTransport. The extended model reveals that
achieving an actual yield of 80% with a test escape of 300 DPM (Defects Per Million) requires an equivalent OTETA that is
about half the acceptable absolute limit of the tested parameter.
Baosheng Wang received his B.S. degree from Beijing University of Aeronautics and Astronautics (BUAA), Beijing, P.R. China, in 1997 and
M.S. degree from Precision Instrument & Mechanical Engineering from the Tsinghua University, Beijing, P. R. China in 2000.
In 2005, he received his Ph.D. degree in Electrical Engineering from the University of British Columbia (UBC), Vancouver,
BC, Canada.
During his Master study, he was doing MEMS, Micro Sensors and Digital Signal processing. From 2000 to 2001, he worked in Beijing
Gaohong Telecommunications Company as a hardware engineer in ATM technology. Currently, he is a Design-for-Test (DFT) engineer
at ATI Technologies Inc., Markham, Ontario, Canada.
He publishes widely at international conferences and journals. His primary research interests are time-driven or timing-oriented
testing methodologies for System on-a-Chip (SoC). These fields include test time reduction for SRAMs, accelerated reliability
test for non-volatile memories, yield analysis for SoC timing tests, SoC path delay timing characterization and embedded timing
measurements.
Andy Kuo is currently a Ph.D student of System on a Chip (SoC) Research Lab at the Department of Electrical and Computer Engineering,
University of British Columbia. He received his M.A.Sc. and B.A.Sc in electrical and computer engineering from University
of British Columbia and University of Toronto in 2004 and 2002 respectively. His research interests include high-speed signal
integrity issues, jitter measurement, serial communications.
Touraj Farahmand received the B.Sc. degree in Electrical Engineering from Esfahan University of Technology, Esfahan, Iran in 1989 and the
M.Sc. in Control Engineering from Sharif university of Technology, Tehran, Iran in 1992. After graduation, he joined the Electrical
and Computer Research center of Esfahan University of Technology where he was involved in the DSP algorithm development and
design and implementation of the control and automation systems. Since October 2001, he has been working in the area of high-speed
signal timing measurement at SoC (System-on-a-Chip) lab of UBC (University of British Columbia) as a research engineer. His
research interests are signal processing, jitter measurement, serial communication and control.
André Ivanov is Professor in the Department of Electrical and Computer Engineering, at the University of British Columbia. Prior to joining
UBC in 1989, he received his B.Eng. (Hon.), M. Eng., and Ph.D. degrees in Electrical Engineering from McGill University. In
1995–96, he spent a sabbatical leave at PMC-Sierra, Vancouver, BC. He has held invited Professor positions at the University
of Montpellier II, the University of Bordeaux I, and Edith Cowan University, in Perth, Australia.
His primary research interests lie in the area of integrated circuit testing, design for testability and built-in self-test,
for digital, analog and mixed-signal circuits, and systems on a chip (SoCs). He has published widely in these areas and holds
several patents in IC design and test. Besides testing, Ivanov has interests in the design and design methodologies of large
and complex integrated circuits and SoCs.
Dr. Ivanov has served and continues to serve on numerous national and international steering, program, and/or organization
committees in various capacities. Recently, he was the Program Chair of the 2002 VLSI Test Symposium (VTS'02) and the General
Chair for VTS'03 and VTS'04. In 2001, Ivanov co-founded Vector 12, a semiconductor IP company. He has published over 100 papers
in conference and journals and holds 4 US patents. Ivanov serves on the Editorial Board of the IEEE Design and Test Magazine,
and Kluwer's Journal of Electronic Testing: Theory and Applications. Ivanov is currently the Chair of the IEEE Computer Society's
Test Technology Technical Council (TTTC). He is a Golden Core Member of the IEEE Computer Society, a Senior Member of the
IEEE, a Fellow of the British Columbia Advanced Systems Institute and a Professional Engineer of British Columbia.
Yong Cho received the B.S. degree from Kyung Pook National Unviersity, Korea, in 1981 and the M.S. degree from in electrical and computer
engineering from the University of South Carolina, Columbia, S.C., in 1988 and the Ph.D. degree in electrical engineering
and applied physics from Case Western Reserve University, Cleveland, OH, in 1992.
He is currently a Professor with the Department of Electronics Engineering, Konkuk University, Seoul, Korea. His recent research
interests include SoC Design and Verification, H/W and S/W co-design, and embedded programming on SoC.
Sassan Tabatabaei received his PHD in Electrical Engineering from the University of British Columbia, Vancouver, Canada in 2000. Since then,
he has held several senior technical positions at Vector12 Corp, Guide Technology, and Virage Logic.
His professional and research interests include mixed-signal design and test, and signal integrity and jitter test methodologies
for high-speed circuits and multi-Gbps serial interfaces. He has published several papers and holds a US patent in the area
of timing and jitter measurement. Currently, he holds the position of the director for embedded test at Virage Logic Corporation. 相似文献
18.
The major problem of fault diagnosis with a fault dictionary is the enormous amount of data. The technique used to manage
this data can have a significant effect on the outcome of the fault diagnosis procedure. If information is removed from a
fault dictionary in order to reduce the size of the dictionary, its ability to diagnose stuck-at faults and unmodeled faults
may be severely debased. Therefore, we focus on methods for producing a dictionary that is both small and lossless-compacted.
We propose an efficient dictionary for maximum diagnosis, which is called SD-Dictionary. This dictionary consists of a static
sub-dictionary and a dynamic sub-dictionary in order to make a smaller dictionary while maintaining the critical information
needed for the diagnostic ability. Experimental results on ISCAS’ 85, ISCAS’ 89 and ITC’ 99 benchmark circuits show that the
size of the proposed dictionary is substantially reduced, while the dictionary retains most or all of the diagnostic capability
of the full dictionary.
This work was supported by the “System IC 2010” project of Korea Ministry of Science and Technology and Ministry of Commerce,
Industry and Energy.
Editor: Y. Takamatsu
Sunghoon Chun received the B.S. degrees in Electrical and Electronic Engineering from Yonsei University, Seoul, Korea, in 2002. He was
a Reseach Engineer with ASIC Research Center in Yonsei University. He researched for test methodologies for SoC. He received
the M.S. degrees in Electrical and Electronic Engineering from Yonsei University in 2005. He is currently working toward Ph.D.
degree in Electrical and Electronic Engineering at Yonsei University. His area of interests includes SoC testing, delay testing,
fault diagnosis, functional testing for processor based system and test methodologies for signal integrity faults.
Sangwook Kim received the B.S., and M.S. degrees in Electrical and Electronic Engineering from Yonsei University, Seoul, Korea, in 1999,
and 2001, respectively. He researched for Digital Signal Processor design and fault diagnosis of VLSI. He is a Research Engineer
with SoC Design Group of System IC Division in LG Electronics, Inc. He is currently interested in SoC design for HDTV and
design verification.
Hong-Sik Kim was born in Seoul, Korea, on April 4, 1973. He received the B.S., M.S. and Ph.D. degrees in Electrical and Electronic Engineering
from Yonsei University, Seoul, Korea, in 1977, 1999, and 2004, respectively. He was a Post-Doctorial Fellow with the Institute
of Virginia Technology. He is currently working on System LSI Group in the Samsung Electronics. His current research interest
includes design-for-testability, built-in self tests and fault diagnosis.
Sungho Kang received the B.S. degree from Seoul National University, Seoul, Korea, and the M.S. and Ph.D. degrees in electrical and computer
engineering from The University of Texas at Austin. He was a Post-Doctorial Fellow with the University of Texas at Austin,
a Research Scientist with the Schlumberger Laboratory for Computer Science, Schlumberger Inc., and a Senior Staff Engineer
with the Semiconductor Systems Design Technology, Motorola Inc. Since 1994, he has been an Associate Professor with the Department
of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea. His current research interests include VLSI design,
VLSI CAD and VLSI testing and design for testability. 相似文献
19.
There are two essential ingredients in order for any telecommunications system to be able to provide Quality-of-Service (QoS)
guarantees: connection admission control (CAC) and service differentiation. In wireless local area networks (WLANs), it is
essential to carry out these functions at the MAC level. The original version of IEEE 802.11 medium access control (MAC) protocol
for WLANs does not include either function. The IEEE 802.11e draft standard includes new features to facilitate and promote
the provision of QoS guarantees, but no specific mechanisms are defined in the protocol to avoid over saturating the medium
(via CAC) or to decide how to assign the available resources (via service differentiation through scheduling). This paper
introduces specific mechanisms for both admission control and service differentiation into the IEEE 802.11 MAC protocol. The
main contributions of this work are a novel CAC algorithm for leaky-bucket constrained traffic streams, an original frame
scheduling mechanism referred to as DM-SCFQ, and a simulation study of the performance of a WLAN including these features.
This work has been partly funded by the Mexican Science and Technology Council (CONACYT) through grant 38833-A.
José R. Gallardo received the B.Sc. degree in Physics and Mathematics from the National Polytechnic Institute in Mexico City, the M.Sc. degree
in Electrical Engineering from CICESE Research and Graduate Education Center in Ensenada, Mexico, and the D.Sc. degree in
Electrical Engineering from the George Washington University, Washington, DC. From 1997 to 2000 he worked as a Research Associate
at the Advanced Communications Engineering Centre of the University of Western Ontario, London, Ontario, Canada. From May
to December 2000, he worked as a Postdoctoral Fellow at the Broadband Wireless and Internetworking Research Laboratory of
the University of Ottawa. Since December 2000, Dr. Gallardo has been with the Electronics and Telecommunications Department
of CICESE Research Center, where he is a full professor. His main areas of interest are traffic modeling, traffic control,
as well as simulation and performance evaluation of broadband communications networks, with recent emphasis on wireless local
area networks (WLANs) and wireless sensor networks (WSNs).
Paúl Medina received the B.Eng. degree from the Sonora Institute of Technology, Obregon, Mexico, and the M.Sc. degree from CICESE Research
and Graduate Education Center, Ensenada, Mexico, both in Electrical Engineering. From July to September 2005, he worked as
a Research Associate at the Broadband Wireless and Internetworking Research Laboratory of the University of Ottawa, Canada.
Mr. Medina is currently with CENI2T, Ensenada, Mexico, working as a lead engineer in projects related to routing and access control in wireless sensor networks,
as well as IP telephony over wireless LANs.
Weihua Zhuang received the B.Eng. and M.Eng. degrees from Dalian Maritime University, Liaoning, China, and the Ph.D. degree from the University
of New Brunswick, Canada, all in electrical engineering. Since October 1993, she has been with the Department of Electrical
and Computer Engineering, University of Waterloo, ON, Canada, where she is a full professor. She is a co-author of the textbook
Wireless Communications and Networking (Prentice Hall, 2003). Dr. Zhuang received the Outstanding Performance Award in 2005 from the University of Waterloo, and
the Premier’s Research Excellence Award in 2001 from the Ontario Government. She is an Editor/Associate Editor of IEEE Transactions on Wireless Communications, IEEE Transactions on Vehicular Technology, EURASIP Journal on Wireless Communications
and Networking, and International
Journal
of
Sensor
Networks. Her current research interests include multimedia wireless communications, wireless networks, and radio positioning. 相似文献
20.
Cooperative-diversity slotted ALOHA 总被引:1,自引:0,他引:1
We propose a cooperative-diversity technique for ad hoc networks based on the decode-and-forward relaying strategy. We develop
a MAC protocol based on slotted ALOHA that allows neighbors of a transmitter to act as relays and forward a packet toward
its final destination when the transmission to the intended recipient fails. The proposed technique provides additional robustness
against fading, packet collisions and radio mobility. Network simulations confirm that under heavy traffic conditions, in
which every radio always has packets to send, the proposed cooperative-diversity slotted-ALOHA protocol can provide a higher
one-hop and end-to-end throughput than the standard slotted-ALOHA protocol can. A similar advantage in end-to-end delay can
be obtained when the traffic is light. As a result, the proposed cooperative-diversity ALOHA protocol can be used to improve
these measures of Quality of Service (QoS) in ad hoc wireless networks.
John M. Shea (S’92–M’99) received the B.S. (with highest honors) in Computer Engineering from Clemson University in 1993 and the M.S.
and Ph.D. degrees in electrical engineering from Clemson University in 1995 and 1998, respectively.
Dr. Shea is currently an Associate Professor of electrical and computer engineering at the University of Florida. Prior to
that, he was an Assistant Professor at the University of Florida from July 1999 to August 2005 and a post-doctoral research
fellow at Clemson University from January 1999 to August 1999. He was a research assistant in the Wireless Communications
Program at Clemson University from 1993 to 1998. He is currently engaged in research on wireless communications with emphasis
on error-control coding, cross-layer protocol design, cooperative diversity techniques, and hybrid ARQ.
Dr. Shea was selected as a Finalist for the 2004 Eta Kappa Nu Outstanding Young Electrical Engineer Award. He received the
Ellersick Award from the IEEE Communications Society in 1996. Dr. Shea was a National Science Foundation Fellow from 1994
to 1998. He is an Associate Editor for the IEEE Transactions on Vehicular Technology.
Tan F. Wong received the B.Sc. degree (1st class honors) in electronic engineering from the Chinese University of Hong Kong in 1991,
and the M.S.E.E. and Ph.D. degrees in electrical engineering from Purdue University in 1992 and 1997, respectively. He was
a research engineer working on the high speed wireless networks project in the Department of Electronics at Macquarie University,
Sydney, Australia. He also served as a post-doctoral research associate in the School of Electrical and Computer Engineering
at Purdue University. Since August 1998 he has been with the University of Florida, where he is currently an associate professor
of electrical and computer engineering. He serves as Editor for Wideband and Multiple Access Wireless Systems for the IEEE
Transactions on Communications and as the Editor for the IEEE Transactions on Vehicular Technology. 相似文献