Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.最新文献_第7页

On the power efficiency of sensory and ad-hoc wireless networks 传感和自组织无线网络的功率效率

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197035

B. Hassim, A. Dana

引用次数: 6

A modified hidden weight optimization algorithm for feedforward neural networks 一种改进的前馈神经网络隐权优化算法

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196941

Changhua Yu, M. Manry

引用次数: 16

Adaptive transmission for Infostations: a MC-CDMA implementation 信息站的自适应传输:MC-CDMA实现

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196976

C. Ibars, M. Tan, Y. Bar-Ness

引用次数: 0

An ASIC implementation of adaptive arithmetic coding 自适应算术编码的ASIC实现

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196950

G. Acunto, M. Sans, A. Burg, W. Fichtner

引用次数: 0

Spatial diversity vs. array gain in cellular communication systems 蜂窝通信系统中的空间分集与阵列增益

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197248

B. Friedlander, S. Scherzer

引用次数: 3

Space-time equalization and interference cancellation for MIMO OFDM MIMO OFDM的时空均衡与干扰消除

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197063

M. B. Breinholt, M. Zoltowski, T. Thomas

{"title":"Space-time equalization and interference cancellation for MIMO OFDM","authors":"M. B. Breinholt, M. Zoltowski, T. Thomas","doi":"10.1109/ACSSC.2002.1197063","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197063","url":null,"abstract":"The paper develops equalization techniques that facilitate aggressive frequency reuse in cellular OFDM systems. The initial focus is on the case of a single strong interfering base at the mobile. The interfering base is asynchronous in that its cyclic prefix is not time-aligned with the desired base's cyclic prefix. Various methods for combating the asynchronous, interfering base are developed, based on channel shortening ideas. The most promising method works to align the cyclic prefixes while holding all channel lengths equal to the cyclic prefix length or less. For the case of two receive antennas at the mobile, two sets of space-time filters are designed so that the respective channels at either output for either base are time-aligned with length no greater than the cyclic prefix length. As a result, standard frequency-domain equalization/interference suppression techniques (e.g., MMSE combining) can be applied to the outputs of the space-time filters on a per frequency bin basis to obtain symbol estimates for the desired base. Simulations are presented comparing the BER performance of the candidate techniques.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133644098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Weighted bit-set encodings for redundant digit sets: theory and applications 冗余数字集加权位集编码:理论与应用

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197053

G. Jaberipur, B. Parhami, Mohammad Ghodsi

{"title":"Weighted bit-set encodings for redundant digit sets: theory and applications","authors":"G. Jaberipur, B. Parhami, Mohammad Ghodsi","doi":"10.1109/ACSSC.2002.1197053","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197053","url":null,"abstract":"This paper aims to fill the gap between theoretical studies of redundant number representation dealing with digit-level algorithms, without considering circuit-level details or impact of digit-set encodings, and implementation-oriented studies that typically focus on one particular digit-set encoding. We recognize that radices of practical interest are powers of two, giving each high-radix digit a weight that is a power of two. Furthermore, digit sets are typically encoded in such a way that each bit of the encoded form has a power-of-2 weight within the corresponding position. These observations lead us to define the class of weighted bit-set (WBS) encodings for redundant number systems and study the general properties of this class of representations. While by no means completely general, the class of WBS encodings includes virtually every implementation of redundant arithmetic that we have encountered, including those based on hybrid redundancy. We derive general conditions for a WBS encoding to be viable or efficient and describe how arithmetic operations can be performed on redundant numbers of this type using standard arithmetic components such as full/half-adders and multiplexers.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134624615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Stability and maximum stable throughput of blind retransmission diversity multiple access 盲重传分集多址的稳定性和最大稳定吞吐量

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196966

G. Dimić, N. Sidiropoulos, L. Tassiulas

引用次数: 0

Mean and variance CFAR performance via fiber integration 通过光纤集成的CFAR性能均值和方差

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197279

S.T. Smith

{"title":"Mean and variance CFAR performance via fiber integration","authors":"S.T. Smith","doi":"10.1109/ACSSC.2002.1197279","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197279","url":null,"abstract":"A closed-form analysis of the performance of two-parameter (mean and variance) CFAR normalizers is described. Typically, CFAR normalizers remove the background mean, then display and/or detect using a fixed threshold. If the background variance is varying and unknown, as is oftentimes the case across frequency or beamformer bins, a different threshold must be set for each bin independently, and human operators must view displays with large dynamic ranges. To avoid these problems, the variance may also be normalized. However, in contrast to the case of mean-level normalizers, the output distributions of mean and variance normalizers was previously unknown due to the complicated dependence of their outputs on the mutually dependent sample mean and variance. This paper describes the approach of fiber integration to obtain the distributions of these normalizers. This approach is very general, and can be used to obtain the output statistics of a very wide class of CFAR normalizers and input statistics. An analysis is presented for the case of chi-squared background statistics input to three different two-parameter normalizers: the so-called deflection ratio (z - /spl mu/)//spl sigma/, the log deflection ratio (log z - /spl mu//sub log/)//spl sigma//sub log/, and a new power domain method, called the log-gamma CFAR normalizer, -log/spl Gamma/(v,vz//spl mu/)//spl mu///spl Gamma/(v), where z is the input data, /spl mu/ and /spl sigma//sup 2/ are the sample estimates of the background mean and variance, and v = /spl mu//sup 2///spl sigma//sup 2/. Compared to mean level CFAR, it is shown that the deflection ratios has the least amount of CFAR loss (typically less than 1 dB) of these three, the log-gamma method has slightly more (typically 1 to 2 dB), and that the log-deflection ratio has by far the greatest (typically 4 dB or more).","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133143028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Beamspace array processing for moving sources 移动源的波束空间阵列处理

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197302

Yuanwei Jin, B. Friedlander

引用次数: 1