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2011 International ITG Workshop on Smart Antennas最新文献

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UMICore — A mobile radio physical layer demonstrator 一个移动无线电物理层演示器
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741918
B. Eschbach, Annika Böttcher, P. Vary
{"title":"UMICore — A mobile radio physical layer demonstrator","authors":"B. Eschbach, Annika Böttcher, P. Vary","doi":"10.1109/WSA.2011.5741918","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741918","url":null,"abstract":"This article presents UMICore, a software tool for the demonstration and visualization of various physical layer concepts as well as various channel models. The capabilities of UMICore are illustrated using UMTS LTE as exemplary physical layer with different channel models.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114458523","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
Experimental validation of Interference Alignment techniques using a multiuser MIMO testbed 多用户MIMO测试平台干扰对准技术的实验验证
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741921
Oscar Gonzalez, D. Ramírez, I. Santamaría, J. García-Naya, L. Castedo
{"title":"Experimental validation of Interference Alignment techniques using a multiuser MIMO testbed","authors":"Oscar Gonzalez, D. Ramírez, I. Santamaría, J. García-Naya, L. Castedo","doi":"10.1109/WSA.2011.5741921","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741921","url":null,"abstract":"Hardware platforms and testbeds are an essential tool to evaluate, in realistic scenarios, the performance of wireless communications systems. In this work we present a multiuser Multiple-Input Multiple-Output (MIMO) testbed made up of 6 nodes, each one with 4 antennas, which allows us to evaluate Interference Alignment (IA) techniques in indoor scenarios. We specifically study the performance of IA for the 3-user interference channel in the 5GHz band. Our analysis identifies the main practical issues that potentially degrade the IA performance such as channel estimation errors or collinearity between the desired signal and interference subspaces.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123988213","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: 55
Comparison of generalized Tomlinson-Harashima precoding strategies for the broadcast channel 广播信道中广义Tomlinson-Harashima预编码策略的比较
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741911
Ümit Abay, R. Fischer
{"title":"Comparison of generalized Tomlinson-Harashima precoding strategies for the broadcast channel","authors":"Ümit Abay, R. Fischer","doi":"10.1109/WSA.2011.5741911","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741911","url":null,"abstract":"We study Tomlinson-Harashima precoding (THP) for the broadcast scenario, i.e., transmission from a central base station to a number of scattered, non-cooperating mobile stations. In the linear description of THP, given the data symbol, a suited signal representation is selected from an effective signal constellation. In this paper, we assess how to choose the effective signal constellation. It is shown that conventional THP is optimal with respect to minimizing transmit power under the constraint of preserving the minimum distance of the initial signal constellation, but suffers from an increased number of nearest neighbors. Especially when using 4QAM signaling (the worst case constellation in THP) an alternating periodic extension is attractive as it enables a tradeoff between an increased transmit power and the number of nearest neighbors.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124020604","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
Field trial results for CoMP downlink transmissions in cellular systems 蜂窝系统中CoMP下行传输的现场试验结果
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741943
Jörg Holfeld, E. Fischer, G. Fettweis
{"title":"Field trial results for CoMP downlink transmissions in cellular systems","authors":"Jörg Holfeld, E. Fischer, G. Fettweis","doi":"10.1109/WSA.2011.5741943","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741943","url":null,"abstract":"This paper presents measurement results for coordinated multi-point downlink transmissions as Long Term Evolution - Advanced concept from a cellular test bed in Dresden, Germany. At first, a description of the real-time prototyping system and its signal processing introduces the major modifications from the existing 3GPP-LTE standard. Then, the cellular propagation and measurement environment of the test bed is characterized. Various spatial setups are compared in conjunction with cooperative and non-cooperative base stations as well as cell-center and cell-edge scenarios. Finally, results concerning the geometry factor, time difference of arrivals and spectral efficiencies complete this field trial.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"46 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114122918","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
FDD overhead optimization for a multiuser two-way system with imperfect CSI 具有不完全CSI的多用户双向系统的FDD开销优化
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741923
I. Slim, M. Castañeda, A. Mezghani, J. Nossek
{"title":"FDD overhead optimization for a multiuser two-way system with imperfect CSI","authors":"I. Slim, M. Castañeda, A. Mezghani, J. Nossek","doi":"10.1109/WSA.2011.5741923","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741923","url":null,"abstract":"In this paper, we find the optimum lengths of TUL, TDL and B i.e. the uplink (UL) and downlink (DL) pilots and feedback bits respectively maximizing the sum of the lower bounds of the UL and the DL rates. With the aid of TUL symbols, the Base Station (BS) estimates the UL channel of each user. TDL symbols are means of estimating the downlink channel, which after being normalized and quantized with B bits, is made available at the BS. Estimated Channel State Information (CSI) and quantized Channel Direction Information (CDI), which may be received erroneously, are thus available at the BS for computing the receive and the transmit Zero-forcing (ZF) filters, respectively. The use of ZF enables the derivation of analytical DL and UL mean squared error (MSE) expressions that give a lower bound on the DL and UL rates, respectively, needed for our optimization.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128911078","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
Antenna geometry optimization for 2D direction-of-arrival estimation for radar imaging 雷达成像中二维到达方向估计天线几何优化
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741909
Oliver Lange, Bin Yang
{"title":"Antenna geometry optimization for 2D direction-of-arrival estimation for radar imaging","authors":"Oliver Lange, Bin Yang","doi":"10.1109/WSA.2011.5741909","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741909","url":null,"abstract":"This paper focuses on the optimization of the 2D geometry of sensor arrays for 2D direction-of-arrival (DOA) estimation. Such arrays can be used for radar imaging purposes. Due to the optimization, the number of array channels can be kept quite small, which reduces hardware costs, while highly accurate DOA estimation accuracy can be achieved. Therefore, we derive a very simple expression of the 2D Cramér-Rao bound (CRB). By minimizing the geometry dependent part of the CRB, we can reduce the fine error variance of DOA estimation. In addition, we define a modified beampattern for the single source case, which is valid for all physically possible DOA's. By varying its side lobe level, the probability of DOA outliers can be controlled. Furthermore, external conditions such as the range of possible DOA's and the DOA region of interest are also included in the optimization process to adjust the array to external requirements. By this means, optimum (single source) 2D DOA estimation performance can be achieved for a specific problem. As optimization algorithm, we use an evolution strategy. To show the improvement in DOA estimation accuracy of the optimized arrays, simulation results are presented and compared to standard 1D and 2D array geometries. For empirical validation, we have developed a 77 GHz prototype radar sensor with 16 RX channels. The optimized 2D array geometry is realized with microstrip patches. To estimate the distance and the relative velocity of targets, we apply frequency modulated continuous wave signal processing. In order to show the functionality of this radar imaging sensor, we present some measurement results.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130613265","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: 18
Gradient-based rate balancing for MIMO broadcast channels with linear precoding 基于梯度的线性预编码MIMO广播信道速率均衡
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741942
C. Hellings, M. Joham, W. Utschick
{"title":"Gradient-based rate balancing for MIMO broadcast channels with linear precoding","authors":"C. Hellings, M. Joham, W. Utschick","doi":"10.1109/WSA.2011.5741942","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741942","url":null,"abstract":"The rate balancing problem is considered in the multiple-input single-output (MIMO) broadcast channel with linear transceivers. After introducing relative per-stream rate targets as auxiliary variables, the optimization is performed by a gradient projection algorithm. In addition, the transmit and receive filters are updated and the mean square error matrices are diagonalized in each iteration. Although the algorithm can only find local optima of the considered non-convex optimization problem, numerical simulations show that it achieves good performance while it has a lower complexity than a comparable existing algorithm.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"19 16","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132747548","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: 11
Improving calibration of array antennas via Microwave Imaging 利用微波成像技术改进阵列天线的校准
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741948
T. Dallmann, Dirk Czepluch, D. Heberling
{"title":"Improving calibration of array antennas via Microwave Imaging","authors":"T. Dallmann, Dirk Czepluch, D. Heberling","doi":"10.1109/WSA.2011.5741948","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741948","url":null,"abstract":"Complex array signal processing algorithms like Multiple Signal Classification often require a precise knowledge of the radiation characteristics of the array antenna in use. Calibration of group antennas by determination of antenna array radiation patterns is therefore a fundamental task for improving the performance of these algorithms. From a practical point of view this requirement is challenging, since the environment surrounding the antenna may alter over time or may even be completely unknown. This environment can have a severe influence on the group antenna radiation patterns. The approach proposed in this paper uses a Microwave Imaging technique to reconstruct position and shape of scatterers surrounding the array antenna. This information can further be used to calculate the field scattered by these objects as well as the total radiation pattern of group antenna and environment. The proposed algorithm only requires S-parameters of the antenna array measured in presence of the scatterers. The theoretical concept of this method is presented in this paper. Results obtained by numerical simulation show that this algorithm provides better radiation pattern estimates than other commonly known calibration methods.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115308914","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
Beamspace direction finding based on the conjugate gradient algorithm 基于共轭梯度算法的波束空间测向
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741913
Jens Steinwandt, R. D. Lamare, M. Haardt
{"title":"Beamspace direction finding based on the conjugate gradient algorithm","authors":"Jens Steinwandt, R. D. Lamare, M. Haardt","doi":"10.1109/WSA.2011.5741913","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741913","url":null,"abstract":"Motivated by the performance of the direction finding algorithm based on the conjugate gradient (CG) method and the advantages of operating in beamspace, we develop a new beamspace direction finding algorithm, which we refer to as the beamspace conjugate gradient (BS CG) method. The recently developed Krylov subspace-based CG direction finding algorithm utilizes a non-eigenvector basis and yields a superior resolution performance for closely-spaced sources under severe conditions. However, its computational complexity is similar to the eigenvector-based methods. In order to save computational resources, we perform a beamspace transformation, which additionally leads to significant improvements in terms of the resolution capability and the estimation accuracy. A comprehensive complexity analysis and simulation results demonstrate the excellent performance of the proposed method and show its lower computational complexity.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125975195","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
Impact of transmit impairments on multiuser MIMO non-linear transceivers 传输损伤对多用户MIMO非线性收发器的影响
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741944
José P. González-Coma, P. M. Castro, L. Castedo
{"title":"Impact of transmit impairments on multiuser MIMO non-linear transceivers","authors":"José P. González-Coma, P. M. Castro, L. Castedo","doi":"10.1109/WSA.2011.5741944","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741944","url":null,"abstract":"This paper analyzes the impact of residual transmit impairments on the performance of multiuser Multiple-Input Multiple-Output (MIMO) systems. We focus on the uplink with Decision Feedback (DF) non-linear receivers and the downlink with Tomlinson-Harashima non-linear precoders. We show that transmit noise severely affects the performance of both non-linear transmission schemes, specially for the downlink with THP. Nevertheless, this degradation can be significantly alleviated when including the transmit noise into the transceiver design.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131531905","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: 8
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