Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)最新文献_第9页

Optimum decision feedback multiuser equalization with successive decoding achieves the total capacity of the Gaussian multiple-access channel 采用逐次译码的最优决策反馈多用户均衡实现了高斯多址信道的总容量

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679134

M. Varanasi, T. Guess

{"title":"Optimum decision feedback multiuser equalization with successive decoding achieves the total capacity of the Gaussian multiple-access channel","authors":"M. Varanasi, T. Guess","doi":"10.1109/ACSSC.1997.679134","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.679134","url":null,"abstract":"The complex Gaussian multiple-access channel (GMAC) Y_=AX_+N_ is considered. The transmitters send information independently with a power constraint so that X_ has a product distribution with E[|X/sub k/|/sup 2/]/spl les/P/sub k/. It is known that multiuser codes exist that will achieve any rate-tuple in the capacity region of the GMAC provided that an optimum joint decoder is used. However, little progress has been made in multiuser coding, and moreover, optimum joint decoding would be too complex. We restrict the decoder to be of a successive decoding type with equalization. Such a decoder is parameterized by feedforward and feedback equalization vectors. The optimum successive decoder (OSD) is obtained by maximizing the mutual information for each user over those vectors. The key result of this paper is that the OSD achieves the total capacity of the GMAC at any vertex of the capacity region. With the OSD, each transmitter can use a single-user code independently of the other users. The complexity of equalization is also only linear in the number of users. For the conventional GMAC, Y=/spl Sigma//sub i=1//sup M/ X/sub i/+N, where A is a row vector with unit elements, the OSD is degenerate and involves no equalization. It reduces to the well-known successive decoder for that channel as described by Wynter (1974) and Cover (1975). Furthermore, for the particular case of the uncoded channel, the OSD reduces to a new decision feedback multiuser detector. This detector is optimum in the sense that it maximizes signal-to-interference ratio for each user.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116337997","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: 367

A structured approach for designing low power adders 设计低功耗加法器的结构化方法

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680546

A. Shams, Magdy A. Bayoumi

引用次数: 68

Robust image compression for transmission over time-varying channels 鲁棒图像压缩传输时变信道

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679051

S. Regunathan, K. Rose

{"title":"Robust image compression for transmission over time-varying channels","authors":"S. Regunathan, K. Rose","doi":"10.1109/ACSSC.1997.679051","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.679051","url":null,"abstract":"We propose a rate-distortion (RD) approach to the optimization of image coding for transmission over time-varying channels. The information available about the channel error rate, is used to adapt the joint source-channel coding (JSCC) scheme. We focus on structured JSCC schemes to obtain realizations with feasible complexity. The image is hierarchically quantized, followed by unequal channel error protection matched to the importance of the bits. We allow the use of variable length codes in the source coder which provides adaptation to image statistics and higher compression performance. At the same time, we maintain error resilience by sending the synchronization information error free (through heavy protection). We show that efficient rate-distortion performance can be achieved by optimizing the overall system for the target rate and channel conditions. We present simulation results obtained on coding images for time-varying channels, which show that RD optimized JSCC schemes substantially outperforms conventional fixed length JSCC and can gain more than 6 dB in PSNR of the reconstructed frames.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114991169","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

Parameter estimation and data analysis for stable distributions 稳定分布的参数估计和数据分析

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680366

J. P. Nolan

引用次数: 12

Bayesian estimation of filtered point processes using Markov chain Monte Carlo methods 用马尔科夫链蒙特卡罗方法滤波点过程的贝叶斯估计

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679075

C. Andrieu, A. Doucet, P. Duvaut

引用次数: 6

Blind optimal MMSE receiver for asynchronous CDMA in the presence of multipath 多径存在下异步CDMA盲最优MMSE接收机

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680427

I. Ghauri, D. Slock

引用次数: 4

Signal processing in non-Gaussian noise using mixture distributions and the EM algorithm 基于混合分布和EM算法的非高斯噪声信号处理

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680365

R. Kozick, R. Blum, B. Sadler

引用次数: 20

New edge detection algorithms based on adaptive estimation filters 基于自适应估计滤波器的边缘检测新算法

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679191

M.C. Woodhall, C. Lindquist

引用次数: 9

Coefficient rate and significance maps in transform coding 变换编码中的系数率和显著性图

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679128

W. Yang, J. Gibson

引用次数: 11

Partially blind antenna diversity equalization of a jammed fading channel 干扰衰落信道的部分盲天线分集均衡

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679176

V. Radionov, S. Mayrargue

引用次数: 0