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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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Potential speedup using decimal floating-point hardware 使用十进制浮点硬件的潜在加速
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196949
M. A. Erle, M. Schulte, J. Linebarger
{"title":"Potential speedup using decimal floating-point hardware","authors":"M. A. Erle, M. Schulte, J. Linebarger","doi":"10.1109/ACSSC.2002.1196949","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196949","url":null,"abstract":"This paper addresses the potential speedup achieved by using decimal floating-point hardware, instead of software routines, on a high-performance superscalar architecture. Software routines were written to perform decimal addition, subtraction, multiplication, and division. Cycle counts were then measured for each instruction using the Simplescalar simulator. After this, new hardware algorithms were developed, existing hardware algorithms were analyzed, and cycle counts were estimated for the same set of instructions using specialized decimal floating-point hardware. This data was then used to show the potential speedup obtained for programs with different instruction mixes and a previously developed benchmark.","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":"133586965","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: 42
Differential unitary space-time modulation for a large number of receive antennas 针对大量接收天线的差分酉时调制
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197244
Jibing Wang, M. Fitz, K. Yao
{"title":"Differential unitary space-time modulation for a large number of receive antennas","authors":"Jibing Wang, M. Fitz, K. Yao","doi":"10.1109/ACSSC.2002.1197244","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197244","url":null,"abstract":"For high signal to noise ratios, the design criteria for differential unitary space-time (DUST) codes follow the rank-and-determinant criterion. In this paper, we show that when the number of receiver antennas is large, the Euclidean distance among codewords dominates the performance of DUST codes. Therefore, in the presence of a large number of receive antennas; DUST codes can be optimized by using the Euclidean-distance criterion. Simulation results are given to corroborate the theoretical analysis.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"27 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":"132008058","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
Performance of iterative CDMA receivers with channel estimation in multipath environments 多径环境下信道估计的迭代CDMA接收机性能
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197017
J. Wehinger, R. Muller, M. Loncar, C. Mecklenbrauker
{"title":"Performance of iterative CDMA receivers with channel estimation in multipath environments","authors":"J. Wehinger, R. Muller, M. Loncar, C. Mecklenbrauker","doi":"10.1109/ACSSC.2002.1197017","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197017","url":null,"abstract":"Most works published on iterative CDMA receivers assume perfect channel knowledge or very simple channel models like the flat-fading channel. We want to extend the scope to multipath propagation scenarios and suggest an iterative scheme with channel estimation in the uplink of a chip-synchronous CDMA system. Channel estimates rely on pilot symbols and a posteriori probabilities on code bits from a SISO decoder. The multiuser detector is implemented as a parallel interference canceler with post-MMSE filtering. We present simulation results of the performance in different multipath scenarios, including real channel sounder measurements.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"59 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":"132157049","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: 19
Bayesian approach to phase-difference-based phase unwrapping 基于相位差的相位展开的贝叶斯方法
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197007
G. Fornaro, A. Pauciullo, Eugenio Sansosti
{"title":"Bayesian approach to phase-difference-based phase unwrapping","authors":"G. Fornaro, A. Pauciullo, Eugenio Sansosti","doi":"10.1109/ACSSC.2002.1197007","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197007","url":null,"abstract":"We address the study of phase-difference-based phase unwrapping in a statistical framework. We derive the joint statistics of the measured phased differences on a 2D grid; for two cases, we measure a single or several (scaled) wrapped value(s) of the absolute phase. We then determine and study the structure of the unwrapped phase maximum likelihood estimator and compare it to existing 2D phase-difference-based, single-acquisition, phase unwrapping algorithms. Furthermore, we investigate the possibility of introducing a-priori information.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"24 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":"133192940","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: 14
Parameterisable floating-point operations on FPGA FPGA上可参数化的浮点运算
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196947
B. Lee, N. Burgess
{"title":"Parameterisable floating-point operations on FPGA","authors":"B. Lee, N. Burgess","doi":"10.1109/ACSSC.2002.1196947","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196947","url":null,"abstract":"The paper presents a group of IEEE 754-style floating-point units targeted at Xilinx VirtexII FPGA. Special features of the technology are taken advantage of to produce optimised components. Pipelined designs are given that show the latency of /spl sim/100 MHz single-precision components. Non-pipelined reference designs are included for future comparison purposes.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"92 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":"114421667","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: 93
Blind multiuser detection over highly-dispersive CDMA channels in presence of diversity reception 分集接收条件下高色散CDMA信道上的盲多用户检测
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197025
F. Bandiera, G. Ricci, M. Varanasi
{"title":"Blind multiuser detection over highly-dispersive CDMA channels in presence of diversity reception","authors":"F. Bandiera, G. Ricci, M. Varanasi","doi":"10.1109/ACSSC.2002.1197025","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197025","url":null,"abstract":"This paper addresses blind multiuser detection in a direct-sequence code-division multiple-access (DS/CDMA) network in presence of both multiple-access interference (MAI) and intersymbol interference (ISI). In particular, it considers a DS/CDMA system where K out of N users are transmitting: the N admissible spreading codes are known and so is the code of the user to be demodulated. The number of interferers, the corresponding signatures, and the channel impulse response of each active user are unknown. The spreading codes of the K - 1 interferers are determined via a procedure exploiting the knowledge of the set of the N admissible transmitted codes and of the code of the user of interest. The procedure can be applied to both synchronous and asynchronous systems which employ diversity reception techniques. The performance assessment of a blind decorrelating detector, implemented by resorting to the above-proposed identification procedure, shows that it outperforms a plain subspace-based blind decorrelator for small sizes of the estimation sample.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"159 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":"114529280","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
Range extension and short range performance enhancement in TDMA digital cellular TDMA数字蜂窝的距离扩展和短距离性能增强
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197242
B. Wei, J. Gibson
{"title":"Range extension and short range performance enhancement in TDMA digital cellular","authors":"B. Wei, J. Gibson","doi":"10.1109/ACSSC.2002.1197242","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197242","url":null,"abstract":"A new system enhancement method is proposed for the EIA/TIA-136 system offering both channel operational range extension and improved performance within the current operational range. The research presented investigates the application of the narrowband adaptive multi-rate (NB-AMR) speech codec and the wideband AMR (WB-AMR) codec, both originally designed for the 200 kHz GSM channel, in the TDMA (TIA/EIA-136) 30 kHz system. In particular, we investigate adaptively allocating bits between NB/WB speech coding and error control within the limited channel bandwidth. Four modes out of seventeen have been carefully chosen for the new TDMA/AMR system. Switching between codec rates as channel conditions change produces range extension below a C/I of 15 dB while also improving performance in the existing operational range above 15 dB. Time slot formats are unchanged so that the method is completely compatible with existing 136 systems.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"68 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":"117354741","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
Space-time block codes for eight transmit antennas 八个发射天线的时空分组代码
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197001
Y. Ahmed, R. Buehrer, J. Reed
{"title":"Space-time block codes for eight transmit antennas","authors":"Y. Ahmed, R. Buehrer, J. Reed","doi":"10.1109/ACSSC.2002.1197001","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197001","url":null,"abstract":"In this paper we present full-rate complex nonorthogonal codes for eight transmit antennas and compare their performance to orthogonal designs that provide the same spectral efficiency. The proposed codes have a structure that allows simplified maximum likelihood decoding at the receiver. The decoding scheme is further simplified for rectangular constellations where the real and imaginary parts can be decoded separately. Finally it is shown that the performance of the nonorthogonal codes can be improved significantly by employing a constellation rotation scheme (Sharma et al. (2002)) and this improvement can be attributed to the change in the rank distribution of the code.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"50 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":"123629556","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
Design considerations for efficient reversible variable length codes 高效可逆变长码的设计考虑
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1197188
K. Lakovic, J. Villasenor
{"title":"Design considerations for efficient reversible variable length codes","authors":"K. Lakovic, J. Villasenor","doi":"10.1109/ACSSC.2002.1197188","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1197188","url":null,"abstract":"This paper considers the properties reversible variable length codes (RVLCs) that are relevant for construction of highly efficient codes. We establish the dependency between the codeword section process and the efficiency-limiting parameters in the Huffman-code-based RVLC construction algorithm. Using this result, we propose an RVLC construction algorithm with a new codeword selection mechanism. The proposed algorithm yields RVLCs of higher efficiency relative to the other algorithms.","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":"116844201","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
Diagonally weighted orthogonal space-time block codes 对角加权正交空时分组码
Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI: 10.1109/ACSSC.2002.1196963
G. Ganesan, P. Stoica, E. Larsson
{"title":"Diagonally weighted orthogonal space-time block codes","authors":"G. Ganesan, P. Stoica, E. Larsson","doi":"10.1109/ACSSC.2002.1196963","DOIUrl":"https://doi.org/10.1109/ACSSC.2002.1196963","url":null,"abstract":"This paper shows how the performance of orthogonal space-time block codes can be improved by using a diagonal weighting matrix at the transmitter. The optimal diagonal weighting matrix which minimizes the bit-error-rate is derived. Since the optimal weights depend on the channel, a feedback from the transmitter to the receiver is necessary. However this feedback can be achieved using only log/sub 2/(n/sub t/) bits where n/sub t/ is the number of transmit antennas. Simulations show that for a system with two transmit antennas and one receive antenna, an improvement of 1.5 dB can be achieved with a feedback of only one bit. The effect of errors in the feedback is also analyzed, and an error tolerant weighting scheme is introduced to reduce the adverse effects of feedback errors.","PeriodicalId":284950,"journal":{"name":"Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.","volume":"249 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":"120882381","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: 44
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