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

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Quantitative ambiguity analysis for matched-field source localization 匹配场源定位的定量模糊分析
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197223
Wen Xu, A. Baggeroer, H. Schmidt
{"title":"Quantitative ambiguity analysis for matched-field source localization","authors":"Wen Xu, A. Baggeroer, H. Schmidt","doi":"10.1109/ACSSC.2002.1197223","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197223","url":null,"abstract":"Matched-field methods find source location by matching the measured signal field. The resulted ambiguity output is often characterized by a multimodal structure. At high signal-to-noise ratio (SNR), the peak at the true source position is a global maximum and can be located accurately; below some threshold SNR, the true peak is easily obscured by other ambiguous peaks, leading to an increased localization error. To analyze this threshold performance behaviour, a quantitative approach for error analysis is developed in the context of the maximum likelihood estimate (MLE) and generalized to include environmental uncertainty.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"46 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":"129634816","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: 12
Adaptive filtering using a highly oversampled weighted overlap-add filterbank in an ultra low-power system 超低功耗系统中使用高度过采样加权叠加滤波器组的自适应滤波
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197290
R. Brennan, R. Abutalebi, H. Sheikhzadeh
{"title":"Adaptive filtering using a highly oversampled weighted overlap-add filterbank in an ultra low-power system","authors":"R. Brennan, R. Abutalebi, H. Sheikhzadeh","doi":"10.1109/ACSSC.2002.1197290","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197290","url":null,"abstract":"Filterbank analysis and synthesis strategies prove advantageous in many signal processing areas operating as a divide and conquer strategy tackling difficult problems into an equivalent series of much simpler problems. For example, large convolutional systems encountered in applications such as echo cancellation and feedback cancellation may require a large number of filter taps. Using the filterbank technique, it may equivalently be implemented as a parallel combination of much shorter subband filters. When properly designed, the filterbank subband signals are minimally overlapping in frequency yielding signals that are approximately orthogonal to each other. Lately, digital filterbank techniques, with great precision, have enabled many strategies to be implemented that were difficult or impractical with analog structures. Accordingly, much theory has been developed including the so-called perfect reconstruction filterbank. An oversampled DFT filterbank using WOLA (weighted overlap-add) processing provides an extremely efficient and elegant solution. This paper describes this filterbank within dedicated ASIC and algorithmic procedures for casting many algorithms into a multi-rate framework.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"1 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":"130143712","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: 3
Joint MMSE versus V-BLAST and antenna selection 联合MMSE与V-BLAST和天线选择
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197233
D. Gore, A. Gorokhov, A. Paulraj
{"title":"Joint MMSE versus V-BLAST and antenna selection","authors":"D. Gore, A. Gorokhov, A. Paulraj","doi":"10.1109/ACSSC.2002.1197233","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197233","url":null,"abstract":"In this paper, we discuss the performance of MIMO spatial multiplexing (MIMO-SM) systems. The first part compares the performance of the ordered successive cancellation (OSIC) receiver, with independent encoding per antenna at the transmitter, with the MMSE receiver joint encoding at the transmitter. We show that the latter system has better performance in terms of outage throughput at low and moderate SNR. In the second half, receive antenna sub-set selection is discussed for MIMO-SM systems. In particular, we develop fast, near optimal algorithms that achieved most of the selection gains. We also present extensive Monte Carlo simulations illustrating the performance benefits of sub-set selection.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"35 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":"126821331","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: 36
Joint pitch and voicing estimation for multiband excitation and sinusoidal speech coders 多频带激励和正弦语音编码器的联合基音和语音估计
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197178
Wenhui Jia, W. Chan
{"title":"Joint pitch and voicing estimation for multiband excitation and sinusoidal speech coders","authors":"Wenhui Jia, W. Chan","doi":"10.1109/ACSSC.2002.1197178","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197178","url":null,"abstract":"In conventional multi-band excitation (MBE) speech encoding, pitch is estimated first from the speech signal. Using the estimated pitch, voicing decisions are made for pitch-spaced spectral bands. As the method invariably includes unvoiced components in the speech signal to estimate the pitch, the accuracy of the estimated pitch and voicing decisions are degraded. A novel pitch and voicing estimation scheme is presented, wherein the spectrum of the speech signal is segmented into voiced and unvoiced regions without knowledge of the pitch. Pitch is then estimated only from the voice regions. Experimental results show that the new scheme improves the accuracy of the estimated pitch and voicing decisions, and offers better speech quality.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"27 2 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":"123214386","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: 1
On equivariant adaptation in blind deconvolution 盲反卷积中的等变自适应
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197282
S. Douglas
{"title":"On equivariant adaptation in blind deconvolution","authors":"S. Douglas","doi":"10.1109/ACSSC.2002.1197282","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197282","url":null,"abstract":"In blind source separation, equivariance has been shown to be a useful property for designing simple and efficient iterative algorithms for the task. In this paper, we explore iterative equivariant algorithms for block-based blind deconvolution, in which the deconvolved symbol sequence is found by successively filtering the estimated symbol sequence. A procedure based on maximum likelihood estimation of the source symbol sequence is given, and its performance is studied through simulations. In addition, we show that in the absence of truncation effects, the well-known Shalvi-Weinstein blind deconvolution algorithm is an iterative equivariant blind deconvolution procedure.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"10 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":"128105904","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: 2
Symbol timing estimation in ultra wideband communications 超宽带通信中的符号时序估计
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197115
Z. Tian, Liuqing Yang, G. Giannakis
{"title":"Symbol timing estimation in ultra wideband communications","authors":"Z. Tian, Liuqing Yang, G. Giannakis","doi":"10.1109/ACSSC.2002.1197115","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197115","url":null,"abstract":"This paper takes on a cyclostationary approach to recover timing of ultra-wideband (UWB) transmissions over rich multipath environments. It is demonstrated that timing dependent cyclic statistics exist without resorting to oversampling, due to the symbol repetition pattern inherent to UWB modulation. Based on the received signal's second-order cyclic statistics, non-data-aided time offset estimation algorithms are developed. Timing acquisition relies only on frame rate samples, while low-complexity tracking utilizes pulse rate samples. Both acquisition and tracking schemes are tolerant to UWB channel fading, and additive stationary (possibly colored) noise.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"170 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":"121616788","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: 55
An algebraic integer based encoding scheme for implementing Daubechies discrete wavelet transforms 一种基于代数整数的离散小波变换编码方案
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197320
K. Wahid, V. Dimitrov, G. Jullien, Wael Badawy
{"title":"An algebraic integer based encoding scheme for implementing Daubechies discrete wavelet transforms","authors":"K. Wahid, V. Dimitrov, G. Jullien, Wael Badawy","doi":"10.1109/ACSSC.2002.1197320","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197320","url":null,"abstract":"A novel approach for implementing a discrete wavelet transform (DWT), based on algebraic integer encoding of Daubechies wavelet coefficients is proposed. These encoding techniques eliminate the requirement to approximate the matrix element; rather they use algebraic 'placeholders' for them. Using these mapping techniques, we were able to obtain error-free calculations up to the final reconstruction step, where we can choose an appropriate approximate substitution precision based on hardware/accuracy trade-offs. This paper also demonstrate the new encoding technique offers better performance compared to classical fixed-point binary designs and that it is well suited for high-speed VLSI implementation.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"41 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":"130204678","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: 22
Reducing interference in stochastic time-frequency analysis without losing information 减少随机时频分析中的干扰而不丢失信息
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197041
P. Schreier, L. Scharf
{"title":"Reducing interference in stochastic time-frequency analysis without losing information","authors":"P. Schreier, L. Scharf","doi":"10.1109/ACSSC.2002.1197041","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197041","url":null,"abstract":"The analytic signal is commonly used in stochastic time-frequency analysis in Cohen's class to reduce interference terms. However, we show that the usual time-frequency representation (TFR) based on the analytic signal gives only an incomplete signal description. This is because the analytic signal constructed from a non-stationary real signal is in general improper, which means that it has non-zero complementary correlation. We show how to augment the standard TFR by a complementary TFR to obtain a complete second-order characterization of the signal while still reducing interference terms compared to the TFR of the real signal.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"18 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":"131533330","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
A constrained joint optimization approach to dynamic sensor configuration 动态传感器结构的约束关节优化方法
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196969
D. Sinno, D. Kreithen
{"title":"A constrained joint optimization approach to dynamic sensor configuration","authors":"D. Sinno, D. Kreithen","doi":"10.1109/ACSSC.2002.1196969","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196969","url":null,"abstract":"Through intelligent integration of sensing and processing functions, the sensing technology of the future is evolving towards networks of configurable sensors acting in concert. Realizing the potential of collaborative real-time configurable sensor systems presents a number of challenges, including the need to address the massive global optimization problem resulting from incorporating a large array of control parameters. The paper proposes a systematic approach to addressing complex global optimization problems by constraining the problem to a set of key control parameters and recasting a mission-oriented goal into a tractable joint optimization formulation. Using idealized but realistic physical models, a systematic methodology to approach complex multi-dimensional joint optimization problems is used to compute system performance bounds for dynamic sensor configurations.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"4 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":"131231481","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: 6
Joint equalization and interference suppression in OFDM systems OFDM系统中的联合均衡与干扰抑制
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197091
D. Darsena, G. Gelli, L. Paura, F. Verde
{"title":"Joint equalization and interference suppression in OFDM systems","authors":"D. Darsena, G. Gelli, L. Paura, F. Verde","doi":"10.1109/ACSSC.2002.1197091","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197091","url":null,"abstract":"We consider the problem of joint equalization and narrowband interference (NBI) suppression in orthogonal frequency-division multiplexing (OFDM) systems. Since the conventional zero-forcing (ZF) receiver does not assure satisfactory interference suppression capabilities in severe interference environments, we investigate the potential of the minimum mean-square-error (MMSE) receiver, evaluating in particular the advantage that can be achieved by exploiting the redundancy contained in the cyclic prefix of the OFDM signal.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"46 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":"131248715","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: 4
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