共查询到20条相似文献,搜索用时 0 毫秒
1.
Wonzoo Chung Cheolwoo You 《Broadcasting, IEEE Transactions on》2007,53(3):693-696
In this paper, we propose a blind adaptive equalization scheme for time-varying channels, which combines a blind algorithm based on high order statistics (HOS) and decision-directed (DD) LMS algorithm. In contrast to the ldquostop-and-gordquo algorithm , where DD-LMS adaptation is stopped for unreliable decisions, the proposed algorithm applies a blind algorithm based on HOS for the unreliable decisions. Furthermore, the region of reliable decisions is updated corresponding to the estimated signal quality. Hence, the proposed ldquorun-and-gordquo algorithm inherits MMSE performance of DD-LMS and the (re)acquisition ability of the blind algorithm. Especially, for decision feedback equalizers (DFEs) the proposed algorithm provides robust blind initialization and reacquisition ability under time varying multipath environments. 相似文献
2.
《Reliability, IEEE Transactions on》2008,57(3):529-531
3.
《Engineering Management, IEEE Transactions on》2008,55(4):579-589
4.
《Reliability, IEEE Transactions on》2008,57(1):171-173
A fundamental logical problem in the Bayesian inference of a series system's failure probability is described, a practical means for its mitigation is discussed, and its application to space launch vehicles is illustrated. The problem is the ldquoBayesian Anomaly,rdquo the difference in the system's failure probability per operation inferred from prior estimates, and test or operational experience applied at a lower-level of the system; and from the convolution of the same priors, and of the same experience applied at the system level (or any level above the first). In particular, unlike in a classical inference, the mean estimates differ critically. Although it is not possible to entirely resolve the problem, a practical procedure for mitigating it, establishing consistency among the mean and variance estimates at the two levels, is delineated. 相似文献
5.
《IEEE transactions on circuits and systems. I, Regular papers》2009,56(2):294-306
6.
It has been pointed out that the numerical simulation results presented in the above paper are not consistent with reality. The reason for this inconsistency has analytically been clarified in this note. 相似文献
7.
Wei Chen Zheng-Fu Han Tao Zhang Hao Wen Zhen-Qiang Yin Fang-Xing Xu Qing-Lin Wu Yun Liu Yang Zhang Xiao-Fan Mo You-Zhen Gui Guo Wei Guang-Can Guo 《Photonics Technology Letters, IEEE》2009,21(9):575-577
Quantum key distribution (QKD) networks have recently attracted growing attention. The topology of the local QKD network is the basis of the next-generation global secure communication network. In this letter, we report a realization of a wavelength-routing star type QKD network which can span a metropolis using a commercial backbone optical fiber network without trusted relays. The longest and the shortest fiber lengths between two geographically separated nodes are 42.6 and 32 km, respectively, and the maximum average quantum bit-error rate is below 8%. A novel analysis model with experimental validation is also proposed to evaluate the user's performance in this network under the condition of maximum multiuser crosstalk. 相似文献
8.
《Lightwave Technology, Journal of》2009,27(20):4390-4393
9.
Jong-Seok Kim Hyeong-Ok Lee Sung Won Kim 《Reliability, IEEE Transactions on》2009,58(3):496-500
A. Ghafoor presented node-disjoint paths of even networks using Figs. 4, 5, 6,and 7 (Ghafoor, IEEE Trans. Reliability, vol. 38, no. 1, pp. 5-15). However, the paper contains errors which cause confusion. We show that the node-disjoint paths, and Theorem 4 (Ghafoor, IEEE Trans. Reliability, vol. 38, no. 1, pp. 5-15), are not correct. We propose advanced node-disjoint paths, and prove that the fault diameter of even networks is d+1. This is optimal. 相似文献
10.
11.
In a previously published paper [1], equations are presented that predict the beam-quality factor of beams from multimode fibers. We demonstrate that the simplification made in these equations to generate several of the figures is incorrect and that these formulas cannot be generally simplified for beams that are coherent superpositions of modes. 相似文献
12.
13.
《Professional Communication, IEEE Transactions on》2008,51(2):169-182
Modern communication technology has greatly increased the number of options we can choose among in a variety of evolutionarily important domains, from housing to food to mates. But is this greater choice beneficial? To find out, we ran two experimental studies to examine the effects of increasing option set-size on anticipated and experienced choice perceptions in the modern context of online mate choice. While participants expected greater enjoyment, increased satisfaction, and less regret when choosing from larger (versus smaller) sets of prospective partners (at least up to a point; Study 1), participants presented with a supposedly ideal number of options experienced no improvement in affect and showed more memory confusions regarding their choice than did those participants presented with fewer options (Study 2). Participants correctly anticipated that greater choice would yield increasing costs, but they overestimated the point at which this would occur. We offer an evolutionary-cognitive framework within which to understand this misperception, discuss factors that may make it difficult for decision-makers to correct for it, and suggest ways in which dating websites could be designed to help users choose from large option sets. 相似文献
14.
《IEEE transactions on image processing》2009,18(8):1897-1898
15.
《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2009,17(4):587-592
16.
Dumitrescu M. Toikkanen L. Laakso A. Tukiainen A. Rimpilainen V. Pessa M. 《Photonics Technology Letters, IEEE》2007,19(22):1819-1821
Compositional and strain limitations are often restricting the emission wavelength from quantum-well (QW) lasers. The letter presents simulation and experimental results on the effects of including thin higher bandgap layers into GalnP QWs emitting in the short red wavelength range. These were considered "spiked" single QWs since the thin higher bandgap layers used in our studies varied in composition and led to carrier wavefunctions that are like perturbed single QW wavefunctions rather than wavefunctions of coupled QWs. The edge-emitting lasers having up to four-monolayer AlGalnP "spikes" in the QWs had an emission blueshift of up to 25 nm, whereas the degradation of other laser characteristics was in line with the degradation observed when similar emission blueshift was generated by conventional QW modification. 相似文献
17.
《Solid-State Circuits, IEEE Journal of》2008,43(6):1491-1491
A recent paper on soliton oscillators gave a parsimonious account of earlier work and omitted a critical reference. 相似文献
18.
Liming Xiu 《Circuits and Systems II: Express Briefs, IEEE Transactions on》2007,54(12):1067-1071
The spirit of system-on-chip (SoC) approach is to integrate more and more system functions into one single chip. Consequently, the on-chip clock requirement could be very complicated due to the various functions the chip has to support. To fulfill those clock needs, it is not uncommon for more than several phase-locked loop (PLLs) to be used within one such large chip. Designing these on-chip PLLs is a very challenging task in term of cost and performance. To solve this problem for a HDTV SoC of over 50 millions transistors, a ldquoflying-adderrdquo architecture based PLL (FAPLL) is constructed. This generic FAPLL is instantiated multiple times in this SoC for different functions, resulting in significant chip cost reduction. 相似文献
19.
This paper presents results of an analysis of the sequential test (ST) procedures described in MIL-HDBK-781A, and IEC 61124, intended for checking the mean Time Between Failures (TBF) value under an exponential distribution of the TBF. The methodological basis of the calculations consists in discretization of the ST process through subdivision of the time axis in small segments. By this means, the process is converted into a binomial for which an algorithm, and a fast computer program have been developed; and most important of all, a tool is provided for searching for the optimal truncation. The influence of truncation by time on the Expected Test Time (ETT) characteristics was studied; and an improved truncation method, minimizing this influence, was developed. The distributions of the test times were determined. The type A plan characteristics in IEC 61124:2006 have substantial inconsistencies in the probabilities of types I & II errors (up to a factor of 2), and in the ETT (up to 17%). We checked these results by using the binomial-recursive method, and by simulation. The Type C plans, reproduced from GOST R27.402:2005, are consistent; but there is scope (and need) for substantial improvement of the search algorithm for the optimal parameters. 相似文献
20.
《Circuits and Systems II: Express Briefs, IEEE Transactions on》2009,56(5):344-348