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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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Performance limits on beamforming with finite rate feedback for multiple antenna systems 多天线系统有限速率反馈波束形成的性能限制
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-20 DOI: 10.1109/ACSSC.2002.1197239
K. K. Mukkavilli, A. Sabharwal, B. Aazhang, E. Erkip
{"title":"Performance limits on beamforming with finite rate feedback for multiple antenna systems","authors":"K. K. Mukkavilli, A. Sabharwal, B. Aazhang, E. Erkip","doi":"10.1109/ACSSC.2002.1197239","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197239","url":null,"abstract":"In this work, we address the problem of evaluating the outage performance of beamformers designed for multiple transmit and single receive antenna systems when quantized channel state information is available at the transmitter. We present a tight universal lower bound for the outage probability of an arbitrary beamformer codebook consisting of a finite number of beamforming vectors. We also characterized the loss in outage performance due to the quantized nature of the channel information available at the transmitter. In particular, we show that the outage probability of beamforming based on quantized channel information approaches the performance of perfect information beamforming as (t-1)2/sup -B/(t-1)/, where B is the number of bits used to quantize the vector channel and t is the number of transmit antennas.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128455493","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: 17
Lattice filter implementation with ETSI math operations on the TMS320C62xx 格子滤波器在TMS320C62xx上用ETSI数学运算实现
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196953
A. Buvaneswari, M. Haner
{"title":"Lattice filter implementation with ETSI math operations on the TMS320C62xx","authors":"A. Buvaneswari, M. Haner","doi":"10.1109/ACSSC.2002.1196953","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196953","url":null,"abstract":"The specific lattice filter implementations considered here are the short-term analysis and synthesis filter realizations in the GSM Full Rate (06.10) specifications. With the ETSI math operations like multiply with round (mult-r) to be performed, and with TMS320C62xx's instruction set not consisting of any mult-r or even round operation, the C-compiler generated code fails to achieve the best performance. With techniques like unrolling the loop, intelligent scheduling of the math operations in the pipeline etc., and hand coding in assembly, we show how to achieve a performance better than that of a processor with operations like mult-r in its instruction set.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"11 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":"115312251","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
Joint routing and scheduling metrics for ad hoc wireless networks 自组织无线网络的联合路由和调度度量
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196964
Tolga Girici, A. Ephremides
{"title":"Joint routing and scheduling metrics for ad hoc wireless networks","authors":"Tolga Girici, A. Ephremides","doi":"10.1109/ACSSC.2002.1196964","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196964","url":null,"abstract":"We address the problems of routing and scheduling in resource-limited ad hoc wireless networks supporting connectionless traffic. Motivated by the novel challenges and trade-offs introduced by ad hoc wireless networks, we propose link metric-based distributed routing and scheduling algorithms. We consider limited transceiver, energy and unlimited bandwidth conditions and our performance criteria are average consumed energy, delay, network lifetime and communication overhead caused by the scheduling algorithm. We evaluate the performance of the metrics by detailed simulations.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"11 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":"114669400","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: 25
Clustering methods for accurate DNA base-calling 精确DNA碱基召唤的聚类方法
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197197
E. Manolakos
{"title":"Clustering methods for accurate DNA base-calling","authors":"E. Manolakos","doi":"10.1109/ACSSC.2002.1197197","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197197","url":null,"abstract":"Routinely extending the useful read-lengths of DNA chromatograms beyond 1 kps by employing intelligent base-calling algorithms will be extremely useful to genomics research because in many cases the entire coding region of a gene could fit into a single long read. By segmenting the chromatograms into base-call \"events\" to be labeled in terms of the number of bases they represent, base-calling as a pattern classification problem is formulated. An overview of two unsupervised clustering methods that could be used for its solution is presented.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"15 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":"114675472","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
CDMA sparse channel estimation using a GSIC/AM algorithm for radiolocation 基于GSIC/AM算法的CDMA稀疏信道估计
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197024
Sunwoo Kim, T. Pals, R. Iltis, Hua Lee
{"title":"CDMA sparse channel estimation using a GSIC/AM algorithm for radiolocation","authors":"Sunwoo Kim, T. Pals, R. Iltis, Hua Lee","doi":"10.1109/ACSSC.2002.1197024","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197024","url":null,"abstract":"This paper considers channel parameter estimation in a sparse channel environment for radiolocation. The generalized successive interference cancellation (GSIC) algorithm is used to eliminate the multiple access interference (MAI). To adapt GSIC to sparse channels the alternating maximization (AM) algorithm is considered and the continuous time delay of each path is estimated. The time-of-arrival (TOA) of the first arrival ray is treated as the line-of-sight component. The TOAs from multiple reference nodes to a master node are then used to compute master node position.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"32 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":"116922843","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
Variable rate space-time block codes in MPSK systems MPSK系统中的可变速率空时分组码
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196958
Il Kim, V. Tarokh
{"title":"Variable rate space-time block codes in MPSK systems","authors":"Il Kim, V. Tarokh","doi":"10.1109/ACSSC.2002.1196958","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196958","url":null,"abstract":"We consider a multiple antenna system when combined array processing with spacetime coding is used. We present variable rate space-time block codes for two, three, and four transmit antennas and optimize the transmit power so that the average BER is minimized. Numerical results show that this optimum power allocation scheme provides significant gain over the equal power allocation scheme. We then classify all the variable rate space-time block codes having the same code rates and identify the unique code that achieves the lowest BER. We explicitly compute the performance of the variable rate codes over a Rayleigh fading channel. The proposed variable rate space-time block codes are useful for unequal error protection in multiple transmit antenna systems.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"89 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":"117178159","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
Adaptive power control for CDMA systems using linear quadratic Gaussian control 基于线性二次高斯控制的CDMA系统自适应功率控制
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197154
S. Perreau, M. Anderson, L. White
{"title":"Adaptive power control for CDMA systems using linear quadratic Gaussian control","authors":"S. Perreau, M. Anderson, L. White","doi":"10.1109/ACSSC.2002.1197154","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197154","url":null,"abstract":"In this paper, we present a robust decentralized method for jointly performing channel estimation and closed loop power control for the reverse link of CDMA networks. Our method is based on linear quadratic control system theory and Kalman filtering and does not require any training symbols for channel or signal to interference ratio (SIR) estimation. The main interest of this new scheme is that it improves the performance of current SIR based power control techniques while avoiding the problem of power escalation, which is often observed in current systems. In this paper, we also provide an analysis on the robustness of this method towards errors on the control command and imperfect call admission control.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"98 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":"117196555","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
Underwater acoustic MIMO channel capacity 水声MIMO信道容量
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197002
M. Zatman, Brian H. Tracey
{"title":"Underwater acoustic MIMO channel capacity","authors":"M. Zatman, Brian H. Tracey","doi":"10.1109/ACSSC.2002.1197002","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197002","url":null,"abstract":"The underwater acoustic channel is rich in multipath scattering, making it a promising environment for the application of MIMO communications. However, for typical underwater communications channels, there are difficulties associated with the large fractional bandwidths, significant Doppler dispersion and latencies measured in seconds. We use simulated and experimental data to estimate the channel capacity for typical shallow water MIMO channels, and motivate particular beamforming algorithms which cope with the difficult acoustic environment.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"24 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120837285","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: 15
Site-specific passive sonar performance prediction 现场特定被动声呐性能预测
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197217
N. Owsley
{"title":"Site-specific passive sonar performance prediction","authors":"N. Owsley","doi":"10.1109/ACSSC.2002.1197217","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197217","url":null,"abstract":"A measurement-based plan and methodology are discussed for predicting a passive sonar performance dB-budget at a specific candidate site for which only single omnidirectional hydrophone data is available. Analysis of 24/7 calibrated hydrophone data supports detailed performance forecasting for a costly, large scale acoustic observatory. The candidate site selected for consideration is in a bottom-limited littoral contiguous to a commercial port with a very high level of surface ship traffic. The acoustic data allows the statistical characterization of horizontal coherence distance, acoustic ambient noise floor and peak absolute acoustic sound pressure for so-called high level events (HLEs) due to the passage of surface ships. Histogram analysis of the absolute level of HLEs is used in conjunction with conventional (time delay-and-sum) beamforming (CBF) sidelobe levels to predict optimum-adaptive beamforming (ABF) array gain improvement (AGI). For the specific site considered, time intervals of AGI for ABF relative to CBF greater than 20 dB are predicted.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"7 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":"125838620","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
An enhanced multiband excitation speech coder at 2,400 b/s 2400 b/s的增强型多频带激励语音编码器
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197179
K. Teague
{"title":"An enhanced multiband excitation speech coder at 2,400 b/s","authors":"K. Teague","doi":"10.1109/ACSSC.2002.1197179","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197179","url":null,"abstract":"The design and implementation of a 2400 b/s enhanced multiband excitation (EMBE) speech coder is described. The coder uses a variation of the multiband excitation (MBE) model originally proposed by Griffin and Lim to produce natural sounding and intelligible speech. A pitch-adaptive variable band structure is used for representing voicing decisions, with perceptually weighted spectral smoothing of harmonic amplitudes, and efficient vector quantization of speech spectrum using a four-way split vector quantizer to achieve high quality speech at 2,400 b/s. Objective performance results, in the form of DAM and DRT scores, are presented for quiet and office environments, indicating this coder is well suited for applications requiring low rate communications quality speech.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"267 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":"123258809","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
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