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

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Joint power adaptation, scheduling and routing framework for wireless ad-hoc networks 无线自组织网络的联合功率自适应、调度和路由框架
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506235
Gyouhwan Kim, A. Rajeswaran, R. Negi
{"title":"Joint power adaptation, scheduling and routing framework for wireless ad-hoc networks","authors":"Gyouhwan Kim, A. Rajeswaran, R. Negi","doi":"10.1109/SPAWC.2005.1506235","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506235","url":null,"abstract":"In wireless ad-hoc networks, there exists strong interdependency between protocol layers, due to the shared wireless medium. Hence we cast the power adaptation (physical layer), scheduling (link layer) and routing (network layer) problems into a joint optimization framework. We analyze this hard non-convex optimization problem, and obtain a dual form consisting of a series of sub-problems. The sub-problem demonstrates the functionalities of the protocol layers and their interaction. We show that the routing problem may be solved by a shortest path algorithm. In the case of ultra wide band (UWB) networks, the power adaptation & scheduling problem is simplified and may be solved. Thus, an algorithmic solution to the joint problem, in the UWB case, is developed. Comparison of results with the previous information theoretic capacity results on UWB networks, demonstrates the importance of this cross-layer optimization framework.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"14 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":"116771032","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: 7
A multicarrier-CDMA receiver with full interference suppression and carrier frequency offset recovery 具有完全干扰抑制和载波频偏恢复的多载波cdma接收机
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506062
B. Smida, S. Affes, K. Jamaoui, P. Mermelstein
{"title":"A multicarrier-CDMA receiver with full interference suppression and carrier frequency offset recovery","authors":"B. Smida, S. Affes, K. Jamaoui, P. Mermelstein","doi":"10.1109/SPAWC.2005.1506062","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506062","url":null,"abstract":"A low-complexity multicarrier-CDMA space-time receiver with full interference suppression capabilities is developed and analyzed for high-rate transmissions over next-generation CDMA systems. First, we derive a complete model of the interference which takes into account MAI, ISI, and ICI. Based on this model, we introduce a new multicarrier interference subspace rejection (MC-ISR) receiver and analyze its performance in an unknown time-varying Rayleigh channel with multipath, carrier offset and cross-correlation between subcarrier channels. We also propose a realistic implementation of this receiver which includes an efficient strategy for carrier offset recovery in a multicarrier and multiuser detection scheme. Simulation results confirm the net advantage of the full interference suppression capabilities of MC-ISR.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"13 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":"114771677","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: 5
Robust real-time channel prediction based on inaccurate instantaneous measurements: an approach 基于不准确瞬时测量的鲁棒实时信道预测:一种方法
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506081
J. Klaue, A. Aguiar
{"title":"Robust real-time channel prediction based on inaccurate instantaneous measurements: an approach","authors":"J. Klaue, A. Aguiar","doi":"10.1109/SPAWC.2005.1506081","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506081","url":null,"abstract":"The goal of this work is to show the feasibility of real-time signal strength prediction on the base of instantaneous channel measurements. In real-world systems, like currently available commercial WLAN equipment, the instantaneous signal levels can only be measured with little accuracy. They are affected by a lot of noise from different sources, the measurement hardware is often not calibrated and the sampling interval is coarse and varying. Channel prediction should therefore be able to deal with noisy and non-equidistant data. Furthermore, the algorithms should be relatively simple, since no complex hardware can be afforded for simple WLAN, Bluetooth or sensor systems. In this paper we introduce a prediction algorithm based on a simple artificial neural network. The algorithm is tested on signal strength values measured with a standard 802.11b WLAN card in various environment conditions. The prediction results are compared with a state-of-the-art channel prediction algorithm. We show that a simple artificial neural network can be used as a robust and comparatively accurate predictor.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"40 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":"125233445","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: 5
UWB mixed-signal transform-domain receiver front-end architectures 超宽带混合信号变换域接收机前端结构
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506305
S. Hoyos, B. Sadler
{"title":"UWB mixed-signal transform-domain receiver front-end architectures","authors":"S. Hoyos, B. Sadler","doi":"10.1109/SPAWC.2005.1506305","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506305","url":null,"abstract":"This paper provides the fundamental structures of a family of mixed-signal receivers constructed from the coefficients obtained from analog to digital conversion (ADC) of signal expansions of the received continuous-time signal. The receiver structures presented here are motivated from the increasing demand of high sampling rates required in broadband communication systems. To this end, this family of receivers efficiently parallelizes the ADC structure through the signal projection of the received signal onto a set of basis functions. We show that the sampling rate requirements are relaxed as the number of basis functions is increased, which introduces a trade-off between complexity and sampling rate. An example with a multiband ultra-wideband orthogonal frequency division multiplexing receiver is presented, which shows practical degrees of the trade-off between complexity and sampling rate reduction. Additionally, although the paper focuses in the design of linear digital receivers (matched filter, RAKE, MMSE, etc), an example with a nonlinear receiver based on transmitted-reference signaling is also provided.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"6 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":"124323042","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
An energy efficient source coding and modulation scheme for wireless sensor networks 一种节能的无线传感器网络源编码和调制方案
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506232
J. Kim, J. Andrews
{"title":"An energy efficient source coding and modulation scheme for wireless sensor networks","authors":"J. Kim, J. Andrews","doi":"10.1109/SPAWC.2005.1506232","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506232","url":null,"abstract":"A direct sequence code division multiple access (DS-CDMA) system combined with modified minimum energy (MME) coding is proposed and analyzed. The MME coding improves energy savings and error performance of minimum energy (ME) coding by partitioning a codeword into several subframes and using indicator bits. The results show that the proposed system clearly outperforms DS-CDMA systems with or without ME coding in terms of energy consumption and bit error rate. This indicates that combining MME coding and DS-CDMA is an attractive choice for wireless sensor networks.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"12 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":"121507531","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: 21
On the second-order statistics of the instantaneous mutual information of time-varying fading channels 时变衰落信道瞬时互信息的二阶统计量
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506056
Shuangquan Wang, Ali Abdi
{"title":"On the second-order statistics of the instantaneous mutual information of time-varying fading channels","authors":"Shuangquan Wang, Ali Abdi","doi":"10.1109/SPAWC.2005.1506056","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506056","url":null,"abstract":"In this paper, the instantaneous mutual information random process is defined and its second-order statistics such as the autocorrelation and autocovariance functions, level crossing rate, and average outage duration are studied in Rayleigh fading channels with non-isotropic scattering. Closed-form expressions and simple approximate results are derived for the statistics of the instantaneous mutual information random process, and their accuracies are verified via Monte Carlo simulations.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"143 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":"121759702","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
Linear precoding versus linear multiuser detection in the downlink of TDD-CDMA systems TDD-CDMA系统下行链路的线性预编码与线性多用户检测
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506267
B. Berenguer, X. Wang, D. Reynolds, A. Høst-Madsen
{"title":"Linear precoding versus linear multiuser detection in the downlink of TDD-CDMA systems","authors":"B. Berenguer, X. Wang, D. Reynolds, A. Høst-Madsen","doi":"10.1109/SPAWC.2005.1506267","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506267","url":null,"abstract":"In this paper, we compare two classes of linear interference suppression techniques for downlink TDD-CDMA systems, namely, linear multiuser detection methods (receiver processing) and linear precoding methods (transmitter processing). For the linear precoding schemes, we assume that the channel state information (CSI) is available only at the transmitter but not at the receiver. We propose several precoding techniques and the corresponding power control algorithms. The performance metric used in the comparisons is the total power required at the transmitter to achieve certain QoS at the receiver. Our results reveal that in general multiuser detection and precoding offer similar performance; but in certain scenarios, precoding can bring a substantial performance improvement. These results motivate the use of precoding techniques to reduce the complexity of the mobile terminals (only a matched-filter to the own spreading sequence is required without CSI).","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"74 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":"124787540","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
Robust power allocation techniques for MIMO systems under modulus channel knowledge at the transmitter 发射机信道知识模量下MIMO系统的鲁棒功率分配技术
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506228
M. Payaró, Xavier Mestre, A. Pérez-Neira, M. Lagunas
{"title":"Robust power allocation techniques for MIMO systems under modulus channel knowledge at the transmitter","authors":"M. Payaró, Xavier Mestre, A. Pérez-Neira, M. Lagunas","doi":"10.1109/SPAWC.2005.1506228","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506228","url":null,"abstract":"In this paper, we study a family of robust power allocation techniques for multi-input multi-output communication systems with incomplete channel state information at the transmitter side. Precisely, we focus our attention to the case where the transmitter has access only to the modulus of the channel coefficients. We present the robust techniques under two main approaches: the Bayesian (or stochastic) point of view, and the maximin (or worst-case) criterion. The formulation developed in this paper holds for flat fading channels, and also for frequency selective channels; in this latter case, through a multicarrier perspective.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"13 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":"114630407","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: 7
Parallel particle filters for tracking in wireless sensor networks 用于无线传感器网络跟踪的平行粒子滤波器
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506277
G. Ing, Mark J. Coates
{"title":"Parallel particle filters for tracking in wireless sensor networks","authors":"G. Ing, Mark J. Coates","doi":"10.1109/SPAWC.2005.1506277","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506277","url":null,"abstract":"An important application of wireless sensor networks is the tracking of objects moving through a monitored area. In some circumstances, a particle filter can perform substantially better than other tracking algorithms. A simple implementation is to transmit measurement data gathered at distributed sensors to a fusion centre and apply a single particle filter. The filter estimates the current position and predicts future locations so that appropriate sensors can be activated. This centralized approach can be energy-expensive and prone to failure: uncompressed data must be transmitted across multiple hops and there is a concentration of data transmission around the fusion site, which constitutes a single point of failure. This paper addresses these issues by proposing a distributed particle filter implementation in which parallel filters run at multiple nodes. These shared filters are used to quantize vectors of measurements. Simulations indicate that the scheme significantly reduces the energy expenditure of communication.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"1 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":"130836150","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: 39
Performance analysis of semi-blind channel estimation using superimposed training 基于叠加训练的半盲信道估计性能分析
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505866
X. Meng, Jitendra Tugnait
{"title":"Performance analysis of semi-blind channel estimation using superimposed training","authors":"X. Meng, Jitendra Tugnait","doi":"10.1109/SPAWC.2005.1505866","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505866","url":null,"abstract":"Channel estimation for single-input multiple-output (SIMO) time-invariant channels is considered using superimposed training. A periodic (non-random) training sequence is arithmetically added (superimposed) at a low power to the information sequence at the transmitter before modulation and transmission. Recently in Meng and Tugnait (2004), an iterative scheme for joint channel estimation and data detection was presented and illustrated via simulation examples, without any analytical performance analysis. In this paper we present a performance analysis of this iterative channel estimation method. An illustrative simulation example is also provided.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"28 23 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":"132800619","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
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