共查询到20条相似文献,搜索用时 15 毫秒
1.
针对高速接收机并行帧同步模糊状态多、假锁概率高的问题,提出了一种改进的帧同步处理方法.该方法通过截取信号中的一段数据进行回放来降低处理速度,减少了帧同步中的模糊状态.对改进方法的帧同步建立时间和性能进行了理论分析和计算.计算数据表明,新方法在硬件资源和帧同步时间变化不大的情况下使假同步概率减小为原来的1/PM,改善了接收机性能. 相似文献
2.
3.
Testing time and power consumption during the testing of SoCs are becoming increasingly important with an increasing volume of test data in intellectual property cores in SoCs. This paper presents a new algorithm to reduce the scan‐in power and test data volume using a modified scan latch reordering algorithm. We apply a scan latch reordering technique to minimize the column hamming distance in scan vectors. During scan latch reordering, the don't‐care inputs in the scan vectors are assigned for low power and high compression. Experimental results for ISCAS 89 benchmark circuits show that reduced test data and low power scan testing can be achieved in all cases. 相似文献
4.
5.
6.
对于重复率较高的任意类型大量数据的排序,文中提出了一种新算法。该算法具有快速排序算法的简洁性,又避开了递归算法,时间复杂度为O(n),空间复杂度为O(1)。理论分析和实验表明,该算法的性能明显优于其它排序算法,适合于数据量较大的场合。 相似文献
7.
在无线通信中,当采用多发送天线增加带宽效率时,空时编码可以提供分集增益和编码增益.本文介绍并比较了两种用于高速无线数据通信的空时编码空时格栅编码(STTC)和空时分组编码(STBC). 相似文献
8.
Alamouti code is the only known Orthogonal Space Time Block Code (OSTBC) with rate-1. All other known orthogonal codes have
rate less than unity. The orthogonal property of OSTBCs reduces the decoding complexity to a large extent. High data rate
Space Time Block Codes for arbitrary number of transmit antennas were recently proposed based on Division Algebras. But these
STBCs are not orthogonal. Therefore their decoding complexity is very high. In this paper we propose high data rate Alamouti
codes from field extensions for two transmit antennas. Our codes have better coding gain than the both high rate codes from
division algebra and the rate-1 Alamouti code.
Vishwanath R was born in Hyderabad, India in 1982. He did his B.E. in Electronics and Communications Engineering from Birla Institute
Of Technology, Ranchi, India in 2002 and Master of Technology in Communications Engineering in 2005 from Indian Institute
of Technology Delhi, India.. Currently he is pursuing PhD from Indian Institute of Technology Delhi, India. His research interests
include Routing in Optical Networks, Signal Processing, Wireless Communications and Image Processing. He is a member of the
IEEE.
Bhatnagar Manav R was born in Moradabad, India in 1976. He did his B.E. in Electronics in 1997 and Master of Technology in Communications Engineering
in 2005 from Indian Institute of Technology Delhi, India. He has worked as lecturer in Moradabad Institute of Technology,
Moradabad, India from 1998–2003. He is currently pursuing PhD from Indian Institute of Technology Delhi, India. His research
interests include Routing in Optical Networks, Signal Processing in Wireless Communications and Image Processing. He is a
member of the IEEE. 相似文献
9.
Timo Viero Kim Rounioja Teemu Sipilä Raimo Verkasalo Jarmo Takala Jorma Lilleberg 《Wireless Personal Communications》2007,43(2):281-293
In this paper, dual antenna receiver architectures are studied including RAKE, chip-level linear equalizer, and their combination.
The arithmetic complexity of single and dual antenna receiver methods is analyzed. Cost of such receivers when implemented
with customized hardware or software on application-specific instruction set processors (ASIP) is estimated. The study shows
that feasible dual antenna detection can be obtained with less than 70% additional costs. More flexible implementation supporting
several standards can be obtained with software but it requires higher power consumption due to additional memory. 相似文献
10.
Dumitriu V. Khan G.N. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2009,17(10):1433-1446
This paper presents a new approach to the design and analysis of NoC topologies which is based on the transaction-oriented communication methods of on-chip components. We propose two algorithms that attempt to meet the communication requirement of an on-chip application using a minimum number of network resources for the task, by generating application-specific topologies. In addition, to aid the design process of complex systems, the design method incorporates a form of predictive analysis which can estimate the degree of contention in a given system without performing detailed simulation. This predictive analysis method is used to determine the minimum frequency of operation for generated topologies, and is incorporated into the topology generation process. The proposed design method was tested using real-word applications, including an MPEG4 decoder and a multi-window display application. The generated topologies were found to offer similar or better performance when compared with regular topologies. However, the topologies generated by our method were more economical, using, on average, half the network resources of regular topologies. 相似文献
11.
12.
High Data Rate OFDM System with Simplified DAPSK Demodulation 总被引:2,自引:0,他引:2
LIU Kai-ming WANG Wen-bo LIU Yuan-an Center for Wireless Communications Beijing University of Posts Telecommunications Beijing P.R.China 《中国邮电高校学报(英文版)》2005,12(2)
1IntroductionIn future wireless communication systems beyond3G,high data rate more than 2 Mbps is desired. TheInterSymbol Interference (ISI) resulted fromthe fre-quency-selective fading channel will be a crucial problemwhich may degrade system performance severely.OFDMis an effective technique to combat this adversecharacteristic[1 ~3],and has beenadoptedfor manystan-dards , such as DAB, DTVB, Hiperlan/2 and IEEE802 .11 ,etc .Spectrally efficient modulation schemes have also ab-sorbe… 相似文献
13.
Mehdi Ansari Sadrabadi Amir K. Khandani Farshad Lahouti 《Wireless Communications, IEEE Transactions on》2006,5(12):3335-3338
In this work, we study a multiple-input multiple-output (MIMO) wireless system where the channel state information is partially available at the transmitter through a feedback link. Based on singular value decomposition, the MIMO channel is split into independent sub-channels. Effective feedback of the required spatial channel information entails efficient quantization/encoding of a unitary matrix. We propose two schemes for quantizing unitary matrices via Givens rotations and examine the performance for a scenario where the rates allocated to the sub-channels are selected according to their corresponding gains. Numerical results show that the proposed schemes offer a significant performance improvement as compared to that of MIMO systems without feedback, with a negligible increase in the complexity 相似文献
14.
介绍了CDMA2000中高速率的实现方法,对实现方法带来的好处和存在的问题进行了分析。最后对beyond3G的发展提出了自己的看法。 相似文献
15.
16.
17.
18.
地空高速数据链的关键技术 总被引:1,自引:0,他引:1
高速数据传输是地空数据链的发展趋势。当前器件的工作速度是高速应用的瓶颈,为了能在较低速度的器件上实现高速处理,必须根本性地改变算法结构,采用并行处理方式。并行结构会对解调器的时间同步和载波同步造成影响,需加以研究。为实现高速数据解调,提出了并行处理的解调器结构,研究了并行结构下的定时同步和载波同步方法,分析了克服符号间干扰的判决反馈均衡算法,探讨了抑制宽带信号中窄带干扰的自适应干扰对消方法。 相似文献
19.
20.
Mauro De Sanctis Simone Quaglieri Ernestina Cianca Marina Ruggieri 《Wireless Personal Communications》2005,34(1-2):189-209
This paper addresses the issue of energy efficiency for error control mechanisms over WPAN systems. An analytical formulation
has been developed to study the trade-off between link layer performance and energy consumption for two types of error control
schemes: pure ARQ and type II hybrid ARQ protocol. An MC-CDMA-based system is considered. First of all, the analysis has been
used to compare different error recovery schemes from the energy efficiency point of view. Moreover, it has been found that,
for any channel conditions, there exists an optimal value of the transmit power that maximizes the energy efficiency. The
paper also shows how this result can be used to design the power control of an energy efficient CDMA-based communication system.
Mauro De Sanctis received the “Laurea' degree in Telecommunications Engineering from the University of Roma “Tor Vergata' in 2002. He is
currently a Ph.D. Student and Assistant Professor in the Department of Electronics Engineering of the same University. He
is involved in the DAVID (DAta and Video Interactive Distribution) satellite mission of the ASI (Italian Space Agency); his
research is funded by the ASI. He is also involved in the MAGNET (My personal Adaptive Global NET) European FP6 integrated
project and in the SatNEx European network of excellence. He worked on Italian national research projects on satellite-terrestrial
systems integration such as SHINES (Satellite and HAP Integrated NEtworks and Services) and CABIS (CDMA for Broadband mobile
terrestrial-satellite Integrated Systems). On autumn 2004 he joined the CTIF (Center for TeleInFrastructure), a research center
focusing on modern telecommunications technologies located at the University of Aalborg (Denmark). His main areas of interest
are: integration of different satellite networks, stratospheric platforms and terrestrial networks in a multi-layered fashion,
internetworking and resource management in satellite systems and energy efficiency of WPAN systems.
Simone Quaglieri received the “Laurea' degree cum laude in Telecommunications Engineering from the University of Roma “Tor Vergata', Italy,
in 2004. His thesis, concerning the study of an analytic model for the Raman amplifier in optical systems with high bit rate,
has been developed in the same University. During 2002 he worked as stagiaire on the design and development of optical submarine
systems at the Elettra company (Telecom Italia group, Italy). He is joining the IRIS (Innovative Radio Integrated Systems)
group at the University of Roma “Tor Vergata' as Research Engineer, where he is working on MC-CDMA based technology in the
frame of the MAGNET (My Adaptive Global NETwork) European project. He is also working on error recovery mechanisms over satellite
systems, and his research is funded by the EC in the frame of the SatNEx (Satellite Network of Excellence) European project.
Ernestina Cianca graduated cum laude in Electronics Engineering in 1997 at the University of L'Aquila. She was with Italtel/Siemens (L'Aquila)
from 1997 to 1998. She got her Ph.D. degree from the University of Rome Tor Vergata (URTV). The thesis work was on power management
in CDMA-based satellite systems. She has been employed by the University of Aalborg, Denmark, in the Wireless Networking Groups
(WING), as Research engineer (2000–2001) and as Assistant Professor (2001–2003). In particular, from Sept. 2002 she has been
Technical Manager of Aalborg University for the IST-STRIKE project. She is currently Assistant Professor in Telecommunications
at the URTV (Dpt. of Electronics Engineering), teaching DSP, Information and Coding. Her research mainly concerns wireless
access technologies (CDMA and MIMO-OFDM-based systems), in particular, Radio Resource Management at PHY/MAC layer, ARQ/HARQ,
TCP-IP issues over wireless links, integration of terrestrial and satellite systems. She has been the vice-coordinator of
the following national research programs: CABIS, on CDMA integrated mobile systems (2000-2002) and SHINES, on satellite-HAP
integrated networks for multimedia applications co-financed by MIUR (2002–2004). She is currently working on various European
Projects: EU FP6 IP MAGNET (My personal Adaptive Global NET); EU ASIA LINK EAGER-NetWIC (Euro-Asian Network for Strengthening
Graduate Education and Research in Wireless Communications); EU Network of excellence NEXWAY. She is author of about 40 papers,
on international journals/transactions and proceedings of international conferences.
Marina Ruggieri graduated in Electronics Engineering in 1984 at the University of Roma. She was: with FACE-ITT and GTC-ITT (Roanoke, VA)
in the High Frequency Division (1985–1986); Research and Teaching Assistant at the University of Roma Tor Vergata (URTV) (1986–1991);
Associate Professor in Telecommunications at the University of L'Aquila (1991–1994). Since November 2000 she is Full Professor
in Telecommunications at the URTV (Dpt. of Electronics Engineering), teaching DSP, Information and Coding. In 1999 she has
been appointed member of the Board of Governors of the IEEE AES Society (2000–2002) and re-elected for the period 2003–2005.
Her research mainly concerns space communications and navigation systems (in particular satellites) as well as mobile and
multimedia networks. She is the Principal Investigator of: satellite scientific communications missions (DAVID, WAVE) of ASI;
national research programs (CABIS) on CDMA integrated mobile systems (2000–2002) and on satellite-HAP integrated networks
for multimedia applications (SHINES), co-financed by MIUR (2002–2004). She co-ordinates the URTV Unit in various European
Projects: EU FP6 IP MAGNET (My personal Adaptive Global NET); EU ASIA LINK EAGER-NetWIC (Euro-Asian Network for Strengthening
Graduate Education and Research in Wireless Communications); EU Network of excellence NEXWAY; GALILEO JU 1st Call – July 2003:
VERT (VEhicular Remote Tolling); and in the ASI program on V-band payloads (TRANSPONDERS). She is member of the Editorial
Board of Wireless Personal Communications – an International Journal (Kluwer). She was awarded the 1990 Piero Fanti International
Prize and she had a nomination for the Harry M. Mimmo Award in 1996 and the Cristoforo Colombo Award in 2002. She is author
of about 170 papers, on international journals/transactions and proceedings of international conferences, book chapters and
books. 相似文献