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2012 International Symposium on Wireless Communication Systems (ISWCS)最新文献

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Energy detection spectrum sensing of M-ary QAM systems over AWGN channels AWGN信道上M-ary QAM系统的能量检测频谱感知
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328339
Daniel Sant'Anna Chaves, A. Barreto
{"title":"Energy detection spectrum sensing of M-ary QAM systems over AWGN channels","authors":"Daniel Sant'Anna Chaves, A. Barreto","doi":"10.1109/ISWCS.2012.6328339","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328339","url":null,"abstract":"This article addresses energy detection for spectrum sensing of M-ary quadrature amplitude modulation (QAM) systems. Analytical expressions are developed for the average probability of detection in these systems. The analytical results are validated by numerical simulations and comparisons with different approximated approaches found in the literature are made. We see that the approximations usually found in existing literature are good for a large number of sensing samples or for very low SNR levels, but, otherwise, the use of a particular modulation scheme may have an impact on sensing performance.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130343325","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: 4
Interference alignment with imperfect channel state information at the transmitter 发射机不完全信道状态信息的干扰对准
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328430
Samer Bazzi, G. Dietl, W. Utschick
{"title":"Interference alignment with imperfect channel state information at the transmitter","authors":"Samer Bazzi, G. Dietl, W. Utschick","doi":"10.1109/ISWCS.2012.6328430","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328430","url":null,"abstract":"A novel interference alignment (IA) algorithm is presented. IA solutions can be obtained in closed-form for special cases only. In general, iterative algorithms need to be used. Most of these algorithms are based on a joint design of precoders at the transmitter side and receive filters at the receiver side, while the proposed method achieves IA with a precoder design only. A design based on precoders simplifies the problem structure and allows receive filters to be designed independently of the IA conditions. In case the channel state information at the transmitter side (CSIT) is not perfectly known, IA cannot be completely achieved and the calculated precoders will result in degradation of achievable rates. An adapted receive filter design can help counteract the rate degradation and improve achievable rates as compared to a non-adapted receive filter design. The proposed solution is a good trade-off between required CSIT and achievable rates, as compared to state-of-the-art methods.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114714050","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
Performance analysis of power control for device-to-device communication in cellular MIMO systems 蜂窝MIMO系统中设备对设备通信的功率控制性能分析
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328385
M.G. Rego, T. Maciel, Henrique de H. M. Barros, F. Cavalcanti, Gábor Fodor
{"title":"Performance analysis of power control for device-to-device communication in cellular MIMO systems","authors":"M.G. Rego, T. Maciel, Henrique de H. M. Barros, F. Cavalcanti, Gábor Fodor","doi":"10.1109/ISWCS.2012.6328385","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328385","url":null,"abstract":"The Device-to-Device (D2D) communication can increase data rates and resource utilization in cellular networks. However, the direct application of the D2D communication can cause harmful interference to the cellular network. Therein, power control algorithms become essential tools to keep interference controlled and to ensure improved system performance. In this paper, we study two power control strategies for D2D communication within Multiple Input Multiple Output (MIMO) cellular networks. In the first strategy, each user achieves a certain target Signal to Interference-plus-Noise Ratio (SINR) while minimizing the total transmit power. In the second one, the target SINR varies with user's transmit power. Simulation results show that system capacity can be improved only if D2D communication and power control are appropriately combined.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115466101","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: 27
Robust precoding with general power constraints considering unbounded channel uncertainty 考虑无界信道不确定性的一般功率约束鲁棒预编码
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328350
R. Fritzsche, G. Fettweis
{"title":"Robust precoding with general power constraints considering unbounded channel uncertainty","authors":"R. Fritzsche, G. Fettweis","doi":"10.1109/ISWCS.2012.6328350","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328350","url":null,"abstract":"In this contribution we deal with a cooperative cellular downlink scenario, where collaborating base stations jointly serve multiple users in a multiple-input multiple-output fashion. Linear spatial signal processing filters are applied at transmitter and receiver. The filters are designed in order to optimize four different mean square error related objective functions, considering general power constraints, i.e., transmit power constraints per arbitrary group of antennas. This optimization is based on channel state information, which is only imperfectly known in practical setups. In this contribution, we present a filter design for the stated optimization problems, taking statistical knowledge of unbounded channel uncertainty into account.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122955248","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: 10
Interference channel sum rate optimization on the Grassmann manifold 格拉斯曼流形上干扰信道和速率优化
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328432
M. Rezaee, M. Guillaud
{"title":"Interference channel sum rate optimization on the Grassmann manifold","authors":"M. Rezaee, M. Guillaud","doi":"10.1109/ISWCS.2012.6328432","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328432","url":null,"abstract":"The problem of truncated unitary precoder design for the Multiple-Input Multiple-Output Interference Channel (MIMO-IC) is investigated. A simple gradient ascent method is utilized over the Grassmann manifold to maximize the sum rate achieved over the MIMO-IC. Since such optimization methods are not guaranteed to converge to the global solution, we also introduce an implementation of simulated annealing for the problem at hand and compare the performance of the two methods. The results show that the gradient on the Grassmann manifold provides gains over existing methods such as max-SINR, in particular when asymmetric channels are considered and the achieved performance is comparable to that achieved by more complex methods not restricted to unitary constraints. Furthermore it performs close to the simulated annealing method at low SNR regime.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129426675","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
Reduced rank spatial filter for interference cancellation 减少秩空间滤波器干扰消除
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328366
L. Féty, Rabah Maoudj, M. Terré, L. Martinod, P. Mege
{"title":"Reduced rank spatial filter for interference cancellation","authors":"L. Féty, Rabah Maoudj, M. Terré, L. Martinod, P. Mege","doi":"10.1109/ISWCS.2012.6328366","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328366","url":null,"abstract":"In radio mobile communication, antenna array structure at the reception is used to perform interference cancellation and equalization. We introduce a reception structure where a spatial filter is split between a set of coefficients applied to received signals and a set of coefficients applied to reference signal (pilots symbols). Instead of trying to find this set of filter coefficients, the approach is based, for rank reduction reasons, on the projection of these coefficients on a discrete Fourier basis. In order to avoid a trivial solution, two constraints on filter coefficients are proposed, related algorithms are developed and simulation results are compared. This paper can be viewed as a follow up of a previous work on a similar topic [1].","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130644556","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: 6
An epidemic game between contents in a wireless network 无线网络中内容之间的流行游戏
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328536
E. Altman
{"title":"An epidemic game between contents in a wireless network","authors":"E. Altman","doi":"10.1109/ISWCS.2012.6328536","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328536","url":null,"abstract":"Consider a town with N competing sources of content where each one wishes to disseminate its own content and thus to make its content available to as many destination users as possible. A content here may stand for information about some cultural event or the list of hotels in town or the weather report. The dissemination to the potential destination is done through a fleet of M mobile relays. The rate of dissemination of content of a given source to its potential destinations depends on how many relays have a copy of the content. We therefore focus on the problem of competition over the access to relays. Each source has to trade between the access costs and and the availability of his content in the relays. As access cost we consider here the transmission power used by the source. The power used determines the coverage of the transmission and thus the probability of reaching some relay. We model the competition using stochastic game approaches and then obtain the structure of the equilibrium strategies.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131298842","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
A semi-reliable energy-efficient retransmission mechanism based on the sensing relevancies of source nodes for wireless image sensor networks 基于源节点感知相关性的无线图像传感器网络半可靠节能重传机制
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328419
D. G. Costa, L. A. Guedes, F. Vasques, P. Portugal, Odilson T. Valle
{"title":"A semi-reliable energy-efficient retransmission mechanism based on the sensing relevancies of source nodes for wireless image sensor networks","authors":"D. G. Costa, L. A. Guedes, F. Vasques, P. Portugal, Odilson T. Valle","doi":"10.1109/ISWCS.2012.6328419","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328419","url":null,"abstract":"Whenever reliable transmissions are assured by retransmission mechanisms, higher packet error incur in additional energy consumption due to packet retransmissions, even though many monitoring applications can tolerate some loss in the quality of the received images. In fact, visual information retrieved from source nodes may have different relevancies for the applications, according to the desired monitoring tasks and the current sensors' poses and fields of view. We propose a semi-reliable energy-efficient hop-by-hop retransmission mechanism, where the reliability level of each packet is function of the relevance of the source nodes associated with DWT subbands. Doing so, some of the corrupted packets will not be retransmitted, saving energy of intermediate nodes with low impact to the visual monitoring quality.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131373698","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
Dynamic service selection games in heterogeneous small cell networks with multiple providers 具有多个提供商的异构小蜂窝网络中的动态服务选择博弈
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328534
L. Rose, E. Belmega, W. Saad, M. Debbah
{"title":"Dynamic service selection games in heterogeneous small cell networks with multiple providers","authors":"L. Rose, E. Belmega, W. Saad, M. Debbah","doi":"10.1109/ISWCS.2012.6328534","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328534","url":null,"abstract":"The strategic deployment of small cells, overlaid on existing wireless infrastructure is foreseen as a key technologies enabling wireless operators to offer a plethora of innovative technologies to their customers. This, in turn, introduces novel technical challenges arising from the selfish behavior of the customers who ultimately seek to select their preferred wireless service while optimizing the quality-price trade-off of this choice. Consequently, wireless providers have to select the optimal pricing policies which maximize their revenues while anticipating the customers' behavior. In this paper, we provide a game-theoretic model suitable for modeling and analyzing the complex interactions between providers and customers in heterogeneous wireless networks. The proposed game is based on a hybrid model that combines a Stackelberg formulation in which the service provider acts as a leader and the customers, acting as followers, engage in a non-cooperative Wardrop game. For the customers' game, we show the existence and give the analytic expression of the Wardrop equilibria irrespective of the number of providers, services offered and quality of services functions. Then, we propose and study different best response based dynamics at the customers' level. We show that these dynamics converge to the equilibrium if only a portion of the customers are allowed to change strategy at each instant. For characterizing the equilibrium of the Stackelberg game, we propose a novel distributed algorithm that can be adopted by the providers and customers in a practical network. Numerical results show that providers are able to reasonably predict the customers' behavior by evaluating the outcome of the so called Krasnoselskij algorithm, and, subsequently optimize their price.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128740217","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
Adaptive algorithm and parameter optimization for distributed beamforming in OFDM systems OFDM系统中分布式波束形成的自适应算法及参数优化
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328404
Jari Tissari, Tero Hurnanen, J. Poikonen
{"title":"Adaptive algorithm and parameter optimization for distributed beamforming in OFDM systems","authors":"Jari Tissari, Tero Hurnanen, J. Poikonen","doi":"10.1109/ISWCS.2012.6328404","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328404","url":null,"abstract":"In this paper, we propose and analyse an adaptive algorithm for distributed beamforming in OFDM systems over time and frequency selective channel conditions. We discuss how the key parameters related to convergence speed of the algorithm can be optimized to suit networks with different degrees of transmitter mobility. We show that the proposed adaptive algorithm is beneficial when used in mobile conditions; this is demonstrated by simulation studies using a realistic geometry-based channel model with various transmitter mobilities.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127296077","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
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