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A performance-complexity analysis of four suboptimal SDMA algorithms 四种次优SDMA算法的性能复杂度分析
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475563
T. Maciel, A. Klein
{"title":"A performance-complexity analysis of four suboptimal SDMA algorithms","authors":"T. Maciel, A. Klein","doi":"10.1109/WSA.2008.4475563","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475563","url":null,"abstract":"Space division multiple access (SDMA) is a promising solution to improve the spectral efficiency of future mobile radio systems. However, finding the group of mobile stations (MSs) that maximizes the system capacity using SDMA is a complex combinatorial problem, which can only be assuredly solved through an exhaustive search (ES). Because an ES is usually too complex, several suboptimal SDMA algorithms have been proposed. SDMA algorithms mainly differ on the grouping metrics they employ to quantify the spatial compatibility among MSs and on the grouping algorithm used to build the SDMA groups while avoiding ESs. In this work, the performance-complexity trade-off of four SDMA algorithms is investigated in terms of the average system capacity they achieve and on the number of operations they require. Expressions for the computational complexity of the algorithms are presented and it is shown that the algorithms proposed by the authors by Maciel and Klein (2007) attain almost the same average system capacity with comparable or lower complexity than other algorithms considered for benchmarking.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126238981","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
2D nonuniform array design for imaging applications 成像应用的二维非均匀阵列设计
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475556
M. Moebus, A. Zoubir
{"title":"2D nonuniform array design for imaging applications","authors":"M. Moebus, A. Zoubir","doi":"10.1109/WSA.2008.4475556","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475556","url":null,"abstract":"We address the problem of non-uniform, planar array design with an emphasis on imaging applications. Based on the theory of minimum redundancy arrays, we propose an iterative algorithm that is capable to design highly thinned arrays with a low side-lobe level while retaining the half-power-beam- width of an uniform rectangular array. The computational complexity of the proposed method is substantially lower than for existing methods. The algorithm is applied to real data to demonstrate the effectiveness of the method.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127658349","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
System-level performance evaluation of winner system 赢家系统级绩效评价
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475565
Krystian Safjan, J. Oszmianski, A. Bohdanowicz, Martin Döttling
{"title":"System-level performance evaluation of winner system","authors":"Krystian Safjan, J. Oszmianski, A. Bohdanowicz, Martin Döttling","doi":"10.1109/WSA.2008.4475565","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475565","url":null,"abstract":"This paper investigates the performance of Beyond 3G system following the requirements defined in WINNER (phase I and II) Project and concentrates on two major topics. The first one is a novel frequency domain mutual-information based adaptive coding and modulation (MI-ACM), the second one is the impact of traffic modeling and scheduling on delay and spectral efficiency of such systems. Different MIMO schemes, including Alamouti and PARC utilizing Grid of Beams and SDMA, are examined on the system-level in terms of spectral efficiency and packet delays.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114287920","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
Least-Squares based channel estimation for MIMO relays 基于最小二乘的MIMO中继信道估计
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475542
Panagiota Lioliou, M. Viberg
{"title":"Least-Squares based channel estimation for MIMO relays","authors":"Panagiota Lioliou, M. Viberg","doi":"10.1109/WSA.2008.4475542","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475542","url":null,"abstract":"A least-squares based channel estimation algorithm is proposed for relay-assisted wireless multiple-input multiple-output (MIMO) channels. The method consists of a sequence of LS-problems with the purpose to arrive to a computationally efficient solution. The performance of the proposed algorithm is evaluated as a function of the input signal-to-noise ratio (SNR) for randomly generated Rayleigh flat fading channels. Finally, we study the effect of the channel estimation error on the performance of a MIMO zero-forcing receiver in order to verify the presented analysis.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114374163","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: 74
Per-antenna power constrained rate optimization for multiuser MIMO systems 多用户MIMO系统的单天线功率约束速率优化
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475569
Shuying Shi, M. Schubert, H. Boche
{"title":"Per-antenna power constrained rate optimization for multiuser MIMO systems","authors":"Shuying Shi, M. Schubert, H. Boche","doi":"10.1109/WSA.2008.4475569","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475569","url":null,"abstract":"This paper investigates the problem of linear transceiver design for rate optimization in multiuser Gaussian multi-input-multi-output (MiMO) systems. We focus on a scenario with per-antenna power constraint, which is of importance for a realistic implementation. Two design criteria are considered: (1) maximizing the weighted sum rate subject to per-antenna power constraints; (2) maximizing the minimum user rate subject to per-antenna power constraints. Non-convexity and the complicated mathematical structure of the problems make it difficult to derive efficient, globally optimal algorithms. Even the power allocation problem for sum-rate optimization leads to a problem formulation involving ratios of posynomials, which is generally an intrinsically intractable NP hard problem. The problems studied here are even more complicated, since we consider a joint optimization over powers, transmit filters and receive filters. For these problems, we derive iterative algorithms and prove the monotonic convergence of the algorithms. Additionally, we show that the results can be extended to other variations of the problems and the problems with other kinds of power constraints.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114465227","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: 49
Efficient link measurement model for system level simulations of Alamouti encoded MIMO HSDPA transmissions Alamouti编码MIMO HSDPA传输系统级仿真的有效链路测量模型
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475581
M. Wrulich, M. Rupp
{"title":"Efficient link measurement model for system level simulations of Alamouti encoded MIMO HSDPA transmissions","authors":"M. Wrulich, M. Rupp","doi":"10.1109/WSA.2008.4475581","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475581","url":null,"abstract":"System-level investigations are crucial to determine the performance of transmission strategies on network level. In this paper we derive a novel link measurement model for the evaluation of Alamouti encoded transmissions. Our model allows for the precalculation of so-called fading parameters which are real valued scalars, thus effectively reducing the computational complexity in system level simulations. Finally, we present fading simulations based on our model and discuss the basic performance characteristics of the transmission scheme.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124987046","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: 15
Energy conserving model for the channel power-gain in wireless multi-user downlink scenarios 无线多用户下行信道功率增益的节能模型
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475546
M. Ivrlac, J. Nossek
{"title":"Energy conserving model for the channel power-gain in wireless multi-user downlink scenarios","authors":"M. Ivrlac, J. Nossek","doi":"10.1109/WSA.2008.4475546","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475546","url":null,"abstract":"Established models for the prediction of channel power gain in radio communication systems have got a slight drawback which grows into a real problem in a theoretical large system analysis of downlink scenarios, where the number of user terminals is allowed to grow unboundedly. The problem is that the model predictions of channel power gain do not take into account the existence of additional receivers. As the number of terminals grows unboundedly, the sum of the predicted receive powers increases unboundedly, and eventually becomes larger than the total transmit power. In a passive propagation medium - like air - such model errors conflict with the principle of conservation of energy, when applied to asymptotic large system analysis. We propose a simple generic modification which - while applicable to any of the existent channel power gain models - corrects this model error and is intended as a first step towards the provision of a channel power gain model that allows for a meaningful large system analysis. We present a fully worked out example which, besides providing interesting insight, is also intended to demonstrate that mathematical tractability is not seriously affected by the proposed modification.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132426347","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
Adaptive MIMO-OFDM using OSTBC with imperfect CQI feedback 带有不完全CQI反馈的OSTBC自适应MIMO-OFDM
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475541
A. Kühne, A. Klein
{"title":"Adaptive MIMO-OFDM using OSTBC with imperfect CQI feedback","authors":"A. Kühne, A. Klein","doi":"10.1109/WSA.2008.4475541","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475541","url":null,"abstract":"In this paper, closed form expressions are derived for the average data rate and uncoded bit error rate of a multi-user multiple input multiple output (MIMO) orthogonal frequency division multiple access (OFDMA) system, where two transmission modes are considered, both transmitting the data of the scheduled user using orthogonal space-time block coding (OSTBC) at the transmitter and maximum ratio combining (MRC) at the receiver to exploit spatial diversity. Applying the adaptive transmission mode, an adaptive subcarrier allocation and modulation is performed based on channel quality information (CQI) fed back digitised over a feedback channel to the transmitter. As CQI the resulting instantaneous signal-to-noise ratio (SNR) at the output of the maximum ratio combiner of the different subcarriers is applied to exploit multi-user diversity. The CQI available at the transmitter side is assumed to be imperfect due to time delay, estimation and feedback errors. Applying the non-adaptive transmission mode, no instantaneous CQI is required. A transmission scheme exploiting frequency diversity in addition to the spatial diversity using OSTBC and MRC is employed. The data rates are compared in order to identify the optimal transmission mode depending on the grade of CQI imperfectness, where a given target bit error rate has to be fullfilled.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121770255","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: 9
Mutual information based rate adaptation for MIMO-OFDM systems with finite signal alphabets 基于互信息的有限字母MIMO-OFDM系统速率自适应
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-02-01 DOI: 10.1109/WSA.2008.4475538
C. Bockelmann, D. Wübben, K. Kammeyer
{"title":"Mutual information based rate adaptation for MIMO-OFDM systems with finite signal alphabets","authors":"C. Bockelmann, D. Wübben, K. Kammeyer","doi":"10.1109/WSA.2008.4475538","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475538","url":null,"abstract":"We consider a single user MIMO-OFDM system where spatial multiplexing is applied and formulate rate allocation algorithms to adapt the used modulation alphabet on a per subcarrier basis. As a means to consider the system behavior including the channel code regarding bit or frame error rate (BER, FER) versus normalized average mutual information (NAMI) of an OFDM symbol for several M-QAM alphabets is investigated. To this end an approximation to the mutual information of MIMO systems with M-QAM signal alphabets is derived and compared to channel decomposition approaches to find a complexity/accuracy trade-off. Based on the mutual information results two algorithms using this channel knowledge are introduced. On the one hand, the error rates can be optimized assuming a fixed rate requirement and on the other hand the achieved transmission rate can be optimized under a BER/FER constraint. In both cases a NAMI threshold derived from the simulated system behavior for a specific channel code is used to adapt the allocated modulation alphabets via a greedy algorithm to achieve the target NAMI within an error margin.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121134926","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: 14
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