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2010 International ITG Workshop on Smart Antennas (WSA)最新文献

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Improving low-delay MIMO-OFDM channel estimation 改进低延迟MIMO-OFDM信道估计
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456436
P. Beinschob, U. Zölzer
{"title":"Improving low-delay MIMO-OFDM channel estimation","authors":"P. Beinschob, U. Zölzer","doi":"10.1109/WSA.2010.5456436","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456436","url":null,"abstract":"To overcome performance degradation in mobile multiple input multiple output (MIMO) orthogonal frequency-division multiplexing (OFDM) spatial multiplexing downlink systems an improved channel estimation algorithm is proposed. It yields channel estimates after every OFDM symbol reflecting time-variant channel behavior and provides data with approx. 4 bit/s/Hz for a 4×4 MIMO setup due to a decision directed scheme. Through the usage of short LDPC codes and employing a MIMO-OFDM symbol reconstruction method from the LDPC decoder output significant gains in estimation accuracy were realized in computer experiments even in high velocity scenarios. Simulation results based on 3GPP MIMO spatial channel model show the estimation accuracy for a range of velocities which are underlined by comparison of bit error rates with perfect channel state information and the channel estimation.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"7 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120818641","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
Maximizing LoS MIMO capacity using reconfigurable antenna arrays 使用可重构天线阵列最大化LoS MIMO容量
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456446
M. Matthaiou, A. Sayeed, J. Nossek
{"title":"Maximizing LoS MIMO capacity using reconfigurable antenna arrays","authors":"M. Matthaiou, A. Sayeed, J. Nossek","doi":"10.1109/WSA.2010.5456446","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456446","url":null,"abstract":"The presence of line-of-sight (LoS) components is usually regarded as a limiting factor for multiple-input multiple-output (MIMO) systems due to the lower multiplexing gains compared to the prevalent independent and identically (i.i.d.) Rayleigh fading model. In this paper, we present a versatile methodology for maximizing LoS-MIMO capacity at any operating signal-to-noise ratio (SNR) by capitalizing on some recent results in two areas: i) design of optimized LoS MIMO configurations and ii) MIMO capacity maximization with reconfigurable antenna arrays. Our theoretical and numerical results demonstrate that by simply adjusting the antenna spacing as a function of SNR, significant capacity gains are achievable. In the following, the implications of the model parameters on the system performance are also assessed.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123998131","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: 17
A non-coherent AF scheme for two-way wireless relay networks 一种双向无线中继网络的非相干自动对焦方案
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456384
Z. Utkovski, Yao Cheng, J. Lindner
{"title":"A non-coherent AF scheme for two-way wireless relay networks","authors":"Z. Utkovski, Yao Cheng, J. Lindner","doi":"10.1109/WSA.2010.5456384","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456384","url":null,"abstract":"Motivated from results for the point-to-point block MIMO channels without channel knowledge, we investigate possible communication schemes for the non-coherent two-way relaying channel. We propose one construction where the code is constructed from packings in Grassmann manifolds and evaluate the performance of the coding scheme.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124105824","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
Performance of a cluster-based MAC protocol in multiuser MIMO wireless LANs 多用户MIMO无线局域网中基于集群的MAC协议性能研究
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456434
Azadeh Ettefagh, M. Kuhn, C. Esli, A. Wittneben
{"title":"Performance of a cluster-based MAC protocol in multiuser MIMO wireless LANs","authors":"Azadeh Ettefagh, M. Kuhn, C. Esli, A. Wittneben","doi":"10.1109/WSA.2010.5456434","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456434","url":null,"abstract":"The IEEE 802.11n specifies MIMO techniques to enhance data rate in WLANs. However, using carrier sense multiple access with collision avoidance (CSMA/CA), it can support only point-to-point links. On the other hand, it is known that multiuser MIMO techniques significantly increase the spectral efficiency of a network. There are already some enhanced MIMO signal processing techniques available which enable concurrent multiuser transmissions by utilising multiuser interference cancellation techniques. Multiuser interference can also be cancelled in a distributed manner. To enhance IEEE 802.11n systems such that multiple users can transmit simultaneously, we propose a novel cluster-based CSMA/CA (CB-CSMA/CA) protocol. According to this protocol, nodes in a network are grouped in clusters such that the nodes which belong to the same cluster can transmit or receive simultaneously. In this paper, we explain the basics of the protocol and investigate throughput performance of the CB-CSMA/CA. We apply the CB-CSMA/CA to a multiuser zero-forcing relaying network, where several amplify-and-forward relays assist the communication between multiple source and destination pairs and perform distributed channel orthogonalisation. This cooperative network can be considered as a future application for next generation WLANs. As it is shown, the CB-CSMA/CA provides a significant throughput gain over point-to-point systems.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417938","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
Iterative Sequential GSVD (I-S-GSVD) based prewhitening for multidimensional HOSVD based subspace estimation without knowledge of the noise covariance information 基于迭代序列GSVD (I-S-GSVD)的预白化方法在不知道噪声协方差信息的情况下进行多维HOSVD子空间估计
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456459
J. Costa, F. Roemer, M. Haardt
{"title":"Iterative Sequential GSVD (I-S-GSVD) based prewhitening for multidimensional HOSVD based subspace estimation without knowledge of the noise covariance information","authors":"J. Costa, F. Roemer, M. Haardt","doi":"10.1109/WSA.2010.5456459","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456459","url":null,"abstract":"Recently, the Sequential GSVD (S-GSVD) based prewhitening scheme has been proposed to improve R-dimensional subspace-based parameter estimation schemes in the presence of colored noise or interference with Kronecker structure. To apply the S-GSVD, second order statistics of the noise should be estimated, e.g., via samples captured in the absence of the desired signal components. In this contribution, we propose the Iterative Sequential Generalized Singular Value Decomposition (I-S-GSVD) based prewhitening scheme for multidimensional HOSVD based subspace estimation when information about the noise statistics is not available. Even without the availability of samples in the absence of the desired signals components, it is possible to obtain the prewhitening correlation factors and the signal parameters in an iterative way using a deterministic algorithm in combination with the S-GSVD. This combination constitutes our proposed I-S-GSVD. Finally, the I-S-GSVD inherits the computational efficiency from the S-GSVD compared to matrix based prewhitening schemes.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116243051","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
Spherical harmonics based optimal minimum sidelobe beamforming for spherical sensor arrays 基于球面谐波的球形传感器阵列最优最小旁瓣波束形成
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456430
Haohai Sun, Shefeng Yan, U. P. Svensson, Haohai Sun
{"title":"Spherical harmonics based optimal minimum sidelobe beamforming for spherical sensor arrays","authors":"Haohai Sun, Shefeng Yan, U. P. Svensson, Haohai Sun","doi":"10.1109/WSA.2010.5456430","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456430","url":null,"abstract":"We propose an optimal minimum sidelobe modal beamforming approach based on the spherical harmonics decomposition for spherical sensor arrays, which provide the ability of three-dimensional broad-band beampattern synthesis. The spherical harmonics domain array processing problem is expressed with a matrix formulation. The weight vector design problem is written as a multiply constrained problem, so that the resulting beamformer can provide a suitable trade-off among mutually conflicting beamforming objectives, such as the lowest sidelobe level, beamwidth, multi-null steering, robustness and so on. The multiply constrained problem is formulated as a convex form of second-order cone programming which is computationally tractable. The main advantage of this method over classical element-space array processing approaches is that the frequency dependent components can be pre-decoupled and removed from angular dependent spherical harmonics, so the same beampattern could be used over a frequency range with a single set of array weights, and the complexity of broad-band beamforming optimization algorithms can be reduced.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128403304","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
A per-stream coded bit loading algorithm for MIMO BIC-OFDM systems 一种用于MIMO BIC-OFDM系统的逐流编码位加载算法
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456445
Cheolkyu Shin, Hyuncheol Park, Joonhyuk Kang, Eunhye Nam
{"title":"A per-stream coded bit loading algorithm for MIMO BIC-OFDM systems","authors":"Cheolkyu Shin, Hyuncheol Park, Joonhyuk Kang, Eunhye Nam","doi":"10.1109/WSA.2010.5456445","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456445","url":null,"abstract":"This paper deals with bit-loading techniques for a multiple-input multiple-output bit-interleaved coded orthogonal frequency division multiplexing (MIMO BIC-OFDM) system. The per-stream coded bit loading algorithm is proposed based on a spatial domain power adaptation. For each spatial stream, a different power constraint is assigned using an initial power allocation (IPA) combined with the residual power diversion (RPD). Simulation results verify that the proposed bit loading scheme yields significant capacity gain compared to the existing bit loading algorithms. We also discuss a channel decomposition technique to reduce the feedback overhead.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125655692","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
An LTE-femtocell dynamic system level simulator LTE-femtocell动态系统电平模拟器
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456381
M. Simsek, Tarik Akbudak, Bo Zhao, A. Czylwik
{"title":"An LTE-femtocell dynamic system level simulator","authors":"M. Simsek, Tarik Akbudak, Bo Zhao, A. Czylwik","doi":"10.1109/WSA.2010.5456381","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456381","url":null,"abstract":"A dynamic system level simulator for LTE networks was developed for investigating the interference behaviour of femtocells placed within macrocells. We simulate a multi-cell, multi-user and multi-carrier system in the downlink for Single-Input, Single-Output (SISO) and Multiple-Input, Multiple-Output (MIMO) antenna configurations.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129509314","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: 58
Mitigation of intercell interference without base station cooperation 在没有基站合作的情况下减少小区间干扰
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456379
H. Brunner, J. Nossek
{"title":"Mitigation of intercell interference without base station cooperation","authors":"H. Brunner, J. Nossek","doi":"10.1109/WSA.2010.5456379","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456379","url":null,"abstract":"We consider the downlink of a cellular system based on the spatial channel model of the 3GPP MIMO urban macro cell with multiple antenna base stations and single antenna mobile devices. We analyze the impact of path-loss and intercell interference and classify mobile devices according to their location in a cell. We discuss non-cooperative approaches for maximizing the network sum-rate and propose an algorithm that combines altruistic avoidance of intercell interference and egoistic sum-rate maximization. The sum-rate reached with this algorithm is still limited by intercell interference but outperforms existing non-cooperative methods without introducing a large overhead.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116508212","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
Enhanced sensing error probability estimation for iterative data fusion in the low SNR regime 低信噪比下迭代数据融合的增强感知误差概率估计
2010 International ITG Workshop on Smart Antennas (WSA) Pub Date : 2010-04-29 DOI: 10.1109/WSA.2010.5456439
I. Olabarrieta, J. Ser
{"title":"Enhanced sensing error probability estimation for iterative data fusion in the low SNR regime","authors":"I. Olabarrieta, J. Ser","doi":"10.1109/WSA.2010.5456439","DOIUrl":"https://doi.org/10.1109/WSA.2010.5456439","url":null,"abstract":"In this paper we consider a network of distributed sensors which simultaneously measure a physical parameter of interest, subject to a certain probability of sensing error. The sensed information at each of such nodes is channel-encoded and forwarded to a central receiver through parallel independent AWGN channels. In this scenario, several recent contributions have shown that the end-to-end Bit Error Rate (BER) performance can be dramatically improved if the decoders associated to each received signal and the data fusion stage exchange soft information in an iterative Turbo-like fashion. In order to achieve optimum performance, the probability of sensing error must be known (or estimated) at the receiver. In this work we describe a novel method for estimating such sensing error probability by properly weighting likelihoods output from the Soft-Input Soft-Output decoders (SISO), which is shown to outperform other estimation methods based in hard-decision comparisons, specially in the low SNR regime.","PeriodicalId":311394,"journal":{"name":"2010 International ITG Workshop on Smart Antennas (WSA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130546009","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
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