发布求助
文献互助 智能选刊 最新文献

Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers最新文献

筛选
英文 中文
PCMA: parametric constant modulus algorithm for demodulating co-channel FM signals 参数恒模算法解调同信道调频信号
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540594
A. Rao, R. Kumaresan
{"title":"PCMA: parametric constant modulus algorithm for demodulating co-channel FM signals","authors":"A. Rao, R. Kumaresan","doi":"10.1109/ACSSC.1995.540594","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540594","url":null,"abstract":"We propose a new approach called parametric constant modulus algorithm (PCMA) for demodulating two co-channel signals, each of which are frequency modulated. The algorithm is of interest in cellular communications and military/intelligence applications. Our method is based on minimizing a constant-modulus error (CME) criterion. It as different from the well-known constant modulus algorithm (CMA). Firstly, the CMA is traditionally employed for channel equalization problems. Secondly, the CMA minimizes the CME over the parameters of a transversal filter. On the other hand, our procedure extends the CMA concept to the co-channel signal separation problem: it uses a parametric model for the underlying signals and minimizes the CME over the parameters of the signal model, hence the name parametric CMA (PCMA).","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115906087","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 channel estimation-based adaptive equaliser for time-variant communications channels 基于信道估计的时变通信信道自适应均衡器
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540562
T. Shimamura, S. Semnani, C. Cowan
{"title":"A channel estimation-based adaptive equaliser for time-variant communications channels","authors":"T. Shimamura, S. Semnani, C. Cowan","doi":"10.1109/ACSSC.1995.540562","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540562","url":null,"abstract":"For the purpose of tackling the problem of equalisation in a time variant environment, a novel approach is developed which uses two finite impulse response filters; one is a channel estimator and the other is an equalisation filter. The gradient algorithm with degree 1 least-square fading memory prediction is adopted for the channel estimator. Using the results produced by the channel estimator, the coefficients of the equalisation filter are indirectly updated. Computer simulation results show that the channel estimation based adaptive equaliser provides significant improvement in the case of a second order Markov communication channel model.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123899918","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
Combatting co-channel interferers in a TDMA system using interference estimates from adjacent frames 利用相邻帧的干扰估计来对抗TDMA系统中的同信道干扰
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540573
E. Lindskog
{"title":"Combatting co-channel interferers in a TDMA system using interference estimates from adjacent frames","authors":"E. Lindskog","doi":"10.1109/ACSSC.1995.540573","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540573","url":null,"abstract":"Suppression of co-channel interferers in a TDMA cellular phone system by the use of an antenna array is studied. Especially the problem of suppressing co-channel interferers that appear outside the training sequence is addressed. It is observed that if a cochannel interferer is present during the data sequence but not during the training sequence of a frame, then it will be present during the training sequence of an adjacent frame. The interferer plus noise spectrum of adjacent frames is utilized in order to suppress such co-channel interferers. The effect on the performance is illustrated with an example scenario for the GSM system.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114579948","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
Minimum/maximum phase decomposition of signals inspired by the auditory periphery 听觉外围激发信号的最小/最大相位分解
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540897
R. Kumaresan, A. Rao
{"title":"Minimum/maximum phase decomposition of signals inspired by the auditory periphery","authors":"R. Kumaresan, A. Rao","doi":"10.1109/ACSSC.1995.540897","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540897","url":null,"abstract":"We propose a signal decomposition approach based on our interpretation of the functioning of the auditory periphery. Analogous to previously proposed auditory models, a parallel-bank of M filters forms the front-end of our model. However, each filter output is further decomposed into a minimum-phase (MinP) and a maximum-phase (MaxP) component. These components are analytic signals with special envelope-phase relationships. Once the filter output is decomposed into MinP/MaxP components we compute the instantaneous frequencies of these components. Finally, we sift through the instantaneous frequencies of all the MinP components and retain only those filter outputs that are entirely MaxP. It appears that a handful of instantaneous frequency tracks of MaxP components are sufficient to represent vowel sounds.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"86 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120824807","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
Closed-loop power control performance in a cellular CDMA system 蜂窝CDMA系统的闭环功率控制性能
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540572
A. Chockalingam, L. Milstein
{"title":"Closed-loop power control performance in a cellular CDMA system","authors":"A. Chockalingam, L. Milstein","doi":"10.1109/ACSSC.1995.540572","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540572","url":null,"abstract":"In order to both counteract the near-far problem and maintain a constant average performance to all users in a cellular CDMA system, adaptive power control is essential. In situations where the round trip delay between the mobile and the base station is smaller than the correlation time of the channel (e.g., terrestrial systems, and systems using base stations onboard low altitude UAVs in tactical environments), power control schemes using feedback from the base station can be effective to compensate for the multipath fading. In this paper, we present the performance of such a closed loop power control (CLPC) scheme applied to a cellular CDMA system. The effect of various loop parameters, including power control update rate, loop delay due to propagation and processing, and vehicle speed, on the average bit error performance of the system are estimated through simulation. The capacity improvement due to effective power control in a single cell as well as a multi-cell CDMA system operating over both frequency non-selective and frequency selective fading channels are estimated.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128406679","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
Modified FxLMS algorithms with improved convergence performance 改进的FxLMS算法，提高了收敛性能
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540900
M. Rupp, A. H. Sayed
{"title":"Modified FxLMS algorithms with improved convergence performance","authors":"M. Rupp, A. H. Sayed","doi":"10.1109/ACSSC.1995.540900","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540900","url":null,"abstract":"This paper proposes two modifications of the FxLMS algorithm with improved convergence behaviour albeit at the same computational cost of 2M operations per time step as the original FxLMS update. The paper further introduces a generalized FxLMS recursion and establishes that the various recursions are in fact of filtered-error form. An optimal choice of the step-size parameter in order to guarantee faster convergence, and conditions for robustness, are also derived. Several simulation results are included to illustrate the discussions.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128442277","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: 33
On fractionally-spaced equalizer design for digital microwave radio channels 数字微波无线电信道分数间隔均衡器设计
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540558
C. R. Johnson, H. Lee, J. LeBlanc, T. Endres, R. Casas, E. Tai, Z. Reznic, W. Meyer
{"title":"On fractionally-spaced equalizer design for digital microwave radio channels","authors":"C. R. Johnson, H. Lee, J. LeBlanc, T. Endres, R. Casas, E. Tai, Z. Reznic, W. Meyer","doi":"10.1109/ACSSC.1995.540558","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540558","url":null,"abstract":"Advances in blind identification of fractionally-spaced models for digital communication channels and blind fractionally-spaced equalizer adaptation rely on the assumption that the time span chosen for the fractionally-spaced equalizer exceeds that of the channel. This paper considers time-domain design formulas minimizing the mean-squared symbol recovery error achieved by a finite-length FIR fractionally-spaced equalizer with a time span shorter than the channel impulse response time span for white zero-mean QAM sources in the presence of white zero-mean channel noise. For minimum mean-squared error designs the symbol error rates achievable are plotted versus the ratio of the source variance to the channel noise variance (with the channel model power normalized to achieve a received signal of unit variance) for different fractionally-spaced equalizer lengths on 64-QAM for several T/2-spaced channel models derived from experimental data. Our intent is to fuel the ongoing debate about fractionally-spaced equalizer length selection.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127082961","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
A table-lookup scheme for residue-to-binary conversion 残数到二进制转换的表查找方案
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540543
C.C. Lamb, L. DeBrunner
{"title":"A table-lookup scheme for residue-to-binary conversion","authors":"C.C. Lamb, L. DeBrunner","doi":"10.1109/ACSSC.1995.540543","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540543","url":null,"abstract":"Residue number system (RNS) implementations can provide speedup for addition, subtraction, and multiplication. However, conversion from RNS to binary is a significant bottleneck. We present an efficient scheme to convert residue numbers to binary numbers using table-lookup. The overall goal is to minimize the hardware needed for implementation while maximizing the speed of the conversion. Our design decreases the table size by a factor of 2 and reduces the number of required lookups compared to an existing design.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127175167","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
Blind adaptation of decision feedback equalizers based on the constant modulus algorithm 基于常模算法的决策反馈均衡器盲自适应
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540640
R. Casas, Z. Ding, R. Kennedy, C. R. Johnson, R. Malamut
{"title":"Blind adaptation of decision feedback equalizers based on the constant modulus algorithm","authors":"R. Casas, Z. Ding, R. Kennedy, C. R. Johnson, R. Malamut","doi":"10.1109/ACSSC.1995.540640","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540640","url":null,"abstract":"The constant modulus algorithm (CMA) is a simple and effective blind equalization algorithm that is generally implemented on feedforward linear adaptive equalizers. In this paper, we study the use of CMA on a decision feedback equalizer (CMA-DFE) for blind channel equalization. We analyze the convergence behavior of this highly nonlinear adaptive system. We also find a class of channels for which the decision directed DFE algorithm (DD-DFE) will not converge to the global optimum when initialized at the origin. For some of these channels, the CMA-DFE does not suffer the same ill-convergence.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122378427","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: 16
DSP synthesis with heterogeneous functional units using the MARS-II system 利用MARS-II系统进行异构功能单元的DSP合成
Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Pub Date : 1995-10-30 DOI: 10.1109/ACSSC.1995.540523
Yun-Nan Chang, Ching-Yi Wang, K. Parhi
{"title":"DSP synthesis with heterogeneous functional units using the MARS-II system","authors":"Yun-Nan Chang, Ching-Yi Wang, K. Parhi","doi":"10.1109/ACSSC.1995.540523","DOIUrl":"https://doi.org/10.1109/ACSSC.1995.540523","url":null,"abstract":"This paper presents a new heuristic, concurrent, iterative loop based scheduling and allocation algorithm for high-level synthesis of digital signal processing (DSP) architectures using heterogeneous functional units. In a heterogeneous architecture, functional units could be either bit-serial or digit-serial or bit-parallel. This paper assumes a library of heterogeneous implementation style based functional units to be available. The proposed heuristic synthesis approach generates optimal and near-optimal area solutions. Although optimum synthesis of such architectures were proposed using an integer linear programming (ILP) model our method can produce similar solutions in one to two orders of magnitude less time, at the expense of sacrificing the cost optimality. This new approach has been incorporated into the Minnesota Architecture Synthesis (MARS-II) system.","PeriodicalId":171264,"journal":{"name":"Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130553636","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信