IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.最新文献_第4页

Cutoff-rate in coded synchronous and asynchronous multiple-access 编码同步和异步多址的截止率

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506217

J. Bonet, G. Vázquez

{"title":"Cutoff-rate in coded synchronous and asynchronous multiple-access","authors":"J. Bonet, G. Vázquez","doi":"10.1109/SPAWC.2005.1506217","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506217","url":null,"abstract":"This paper deals with the actual impact of the multiple-access interference (MAI) in the multi-user detection problem for coded-modulations, with applications to the multiple-access scheduling and the optimal multi-user detection problem. The paper analyzes the effect of the cross-correlation between the users signatures and the MAI when optimal maximum likelihood (ML) multi-user detection schemes are used in coded-modulations. The paper shows that the presence of MAI is not critical for most operating conditions, resulting in a relaxation of the conventional (almost) orthogonal signature designs commonly adopted when single or multi-user linear detectors are considered. The analysis is based on the identification of the cutoff-rate associated to the synchronous and the asynchronous multiple access of DS-CDMA schemes. The study of the asynchronous access is of particular interest in the sense that it allows the extension of the analysis for the most relevant case in which the cutoff-rate is computed for frequency selective channels. These results are of interest and applicable for almost stationary or slowly time-varying operating conditions.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131127394","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

Design of MAC protocols with less collision fast resolution for wireless local area networks 无线局域网中少碰撞快速分辨率的MAC协议设计

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505860

Ye Yan, Dongsun Park

引用次数: 2

Towards reducing the gap between PMEPR of multicarrier and single carrier signals 朝着缩小多载波PMEPR与单载波信号差距的方向发展

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506051

M. Sharif, B. Hassibi

{"title":"Towards reducing the gap between PMEPR of multicarrier and single carrier signals","authors":"M. Sharif, B. Hassibi","doi":"10.1109/SPAWC.2005.1506051","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506051","url":null,"abstract":"It has recently been shown that by altering the sign of each subcarrier in a multicarrier system significant reduction in the peak to mean envelope power (PMEPR) can be obtained. In fact, the PMEPR can even be made a constant independent of the number of subcarriers n. However, finding the best sign requires a search over 2/sup n/ possible signs which is computationally prohibitive. In this paper, we first propose a greedy algorithm to choose the signs based on p-norm minimization and we prove that it can achieve a PMEPR of order log n. We further decrease the PMEPR by enlarging the search space considered by the greedy algorithm. By ignoring peaks with probability less than 10/sup -3/, simulation results show that the PMEPR of a multicarrier system with 128 subcarriers each one modulated by 64QAM constellations is reduced to 3.4. This implies that at the cost of one bit of information per subcarrier (i.e., not sending information over the sign of each subcarrier) and modest computational complexity in the transmitter, the PMEPR can be reduced from 12.5 to 3.4 which is within 1.6 dB of the PMEPR of a single carrier system with 64QAM modulation.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133428383","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

Diversity vs. adaptivity in multiple antenna systems 多天线系统中的多样性与自适应

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506068

R. Bohnke, V. Kuhn, K. Kammeyer

引用次数: 4

The use of orthonormal bases in equalization structures 标准正交基在均衡结构中的应用

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506055

Ricardo R Araujo, Glrurd Favier, Joao C. M. Mota, Charles C. Cavalcante

引用次数: 1

Power-efficient analog forwarding transmission in an inhomogeneous Gaussian sensor network 非均匀高斯传感器网络中节能模拟转发传输

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505884

J.-J. Xiao, Z. Luo, Shuguang Cui, A. Goldsmith

{"title":"Power-efficient analog forwarding transmission in an inhomogeneous Gaussian sensor network","authors":"J.-J. Xiao, Z. Luo, Shuguang Cui, A. Goldsmith","doi":"10.1109/SPAWC.2005.1505884","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505884","url":null,"abstract":"In a wireless sensor network (WSN), sensor power is usually limited and must be carefully managed for each intended application. In this paper, we consider the optimal power scheduling for the joint estimation of a Gaussian source by an inhomogeneous Gaussian sensor network. The goal is to minimize the total power consumption while satisfying a certain mean squared distortion constraint. We assume that sensors transmit their observations in an analog fashion: each sensor simply amplifies and forwards its noise-corrupted analog observation through an additive white Gaussian noise (AWGN) channel to the fusion center (FC), while the latter combines the received sensor messages to generate the final estimate. Such analog forwarding strategy can be shown to be optimal in the single sensor case by Shannon's separation principle. For the multiple sensor case, we derive the optimal power scheduling using convex optimization and show that it admits a simple distributed implementation. Simulations show that the proposed power scheduling improves the mean squared error (MSE) performance by a large margin when compared to that achieved by the uniform power scheduling.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124272880","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: 31

Asymptotic detection performance of type-based multiple access in sensor networks 传感器网络中基于类型多址的渐近检测性能

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506293

G. Mergen, V. Naware, L. Tong

{"title":"Asymptotic detection performance of type-based multiple access in sensor networks","authors":"G. Mergen, V. Naware, L. Tong","doi":"10.1109/SPAWC.2005.1506293","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506293","url":null,"abstract":"The problem of communicating sensor readings over a multiaccess channel for detecting a target is considered. A natural way of communication in target detection is to let sensors simultaneously transmit one of two predetermined frequency tones indicating whether the target is detected or not. Recently, this scheme has been generalized to consider non-binary sensor observations by letting sensors simultaneously transmit orthogonal waveforms depending on the value of their observations-type-based multiple access (TBMA). TBMA was shown to be asymptotically optimal in terms of detection-error probability under the idealistic assumptions that the sensor channel gains are identical, and the sensor data are conditionally independent and identically distributed (i.i.d.). In this paper, TBMA is analyzed in a more general framework by considering non-i.i.d. data and non-identical channel gains. An asymptotically optimal detector is proposed and its error-exponents for detection probabilities are characterized using tools from large deviations theory. Numerical simulations are used to demonstrate that the error exponents provide reasonably accurate estimates of the performance of TBMA.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134540314","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

Applications of a linear precoder to multilevel turbo space-time coding 线性预编码器在多电平涡轮空时编码中的应用

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506288

Hungjun Chen, Alexander Huimovich, Javier Garcia-Fr ias

引用次数: 0

Robust multiuser detection in flat fading non-Gaussian channels 平坦衰落非高斯信道的鲁棒多用户检测

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505916

H. Kulatunga, V. Kadirkamanathan

引用次数: 2

Capacity analysis of MMSE pilot-aided transmission for doubly selective channels 双选择信道中MMSE导频辅助传输的容量分析

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506250

A. P. Kannu, Philip Schniter

引用次数: 20