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2008 International ITG Workshop on Smart Antennas最新文献

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Robust downlink beamforming using positive semi-definite covariance constraints 使用正半定协方差约束的鲁棒下行波束形成
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475534
V. Sharma, I. Wajid, A. Gershman, Haihua Chen, S. Lambotharan
{"title":"Robust downlink beamforming using positive semi-definite covariance constraints","authors":"V. Sharma, I. Wajid, A. Gershman, Haihua Chen, S. Lambotharan","doi":"10.1109/WSA.2008.4475534","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475534","url":null,"abstract":"We study the problem of multiuser downlink beamforming under the assumption that only an erroneous channel state information (CSI) is available at the transmitter. The optimization criterion is to minimize the total transmit power subject to the constraints that the user worst-case signal-to-interference-plus-noise ratios (SINRs) are above a pre-defined quality of service (QoS) threshold. In contrast to the earlier approaches to this problem, we take into account positive semi-definiteness of the mismatched channel covariance matrices. Two approaches to solve the resulting robust downlink beamforming problem are proposed using semidefinite programming (SDP). Simulation results validate the robustness of the proposed techniques.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"12 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":"122442178","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
Distributed precoder optimization for interfering MISO channels 干扰MISO信道的分布式预编码器优化
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475571
D. Schmidt, Andreas Gründinger, W. Utschick, M. Honig
{"title":"Distributed precoder optimization for interfering MISO channels","authors":"D. Schmidt, Andreas Gründinger, W. Utschick, M. Honig","doi":"10.1109/WSA.2008.4475571","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475571","url":null,"abstract":"In this paper, we examine the problem of two multiple-input-single-output (MISO) links that interfere with each other. We discuss some straightforward strategies for the users to optimize their rates and show how a certain degree of cooperation between the users can lead to an improvement of both individual links. We propose an algorithm that is based on the users exchanging 'interference prices' and is realizable in a distributed manner. The algorithm converges towards a locally sum-rate optimal solution and exhibits nearly identical performance as a non-distributed gradient ascent algorithm, outperforming the straightforward strategies over the complete range of noise powers.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"42 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":"121387110","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
A dielectric lens antenna for digital beamforming and superresolution DOA estimation in 77 GHz automotive radar 一种用于77 GHz汽车雷达数字波束形成和超分辨DOA估计的介质透镜天线
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475557
P. Wenig, R. Weigel, Martin Schneider
{"title":"A dielectric lens antenna for digital beamforming and superresolution DOA estimation in 77 GHz automotive radar","authors":"P. Wenig, R. Weigel, Martin Schneider","doi":"10.1109/WSA.2008.4475557","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475557","url":null,"abstract":"This paper introduces a novel dielectric lens antenna configuration for automotive radar applications. A cylindric lens fed by a uniform linear array (ULA) accomplishes elevation beam shaping and simultaneously allows for the application of digital beamforming (DBF) and superresolution DOA estimation methods in azimuth. Pattern perturbations due to lens edge effects are systematically analyzed. Finally guidelines for an optimum antenna setup with minimum sensor size are derived. The results show excellent elevation beam shaping performance. High resolution direction of arrival (DOA) estimation is important for future automotive safety systems. The concept has the potential for the application in a low cost automotive radar sensor that is expected to fulfill high DOA estimation requirements.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"66 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":"126239608","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
Maximum likelihood detection for quantized MIMO systems 量化MIMO系统的最大似然检测
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475570
A. Mezghani, M. Khoufi, J. Nossek
{"title":"Maximum likelihood detection for quantized MIMO systems","authors":"A. Mezghani, M. Khoufi, J. Nossek","doi":"10.1109/WSA.2008.4475570","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475570","url":null,"abstract":"In this work, maximum likelihood-detection (ML-detection) for MIMO systems operating on quantized data is considered. It turns out that the optimal decision rule is generally intractable. Therefore, we propose a suboptimal solution with lower complexity. Assuming a Rayleigh fading MIMO environment, an upper bound on the error probability is derived for the case where the number of transmit and receive antennas are equal. Furthermore, we introduce a new performance measure that relates the outage properties to the bit resolution in this context.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"43 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":"127138931","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: 31
Optimal dynamic admission control in heterogeneous networks 异构网络中最优动态准入控制
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475562
Jörg Bühler, G. Wunder
{"title":"Optimal dynamic admission control in heterogeneous networks","authors":"Jörg Bühler, G. Wunder","doi":"10.1109/WSA.2008.4475562","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475562","url":null,"abstract":"In this paper, we study the problem of admission control in heterogeneous network environments where users randomly arrive to the system over time and finish service after a random period of time. We formulate the problem as a dynamic and stochastic assignment problem and find optimal control policies using the technique of semi-Markov decision processes. The performance of optimal control policies is compared to the performance of a greedy strategy. Furthermore, we analytically study some structural properties of optimal policies for systems with ordered resource cost values.","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":"130848886","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
On maximizing the sum network MISO broadcast capacity 关于最大化网络MISO广播容量的问题
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475567
M. Castañeda, A. Mezghani, J. Nossek
{"title":"On maximizing the sum network MISO broadcast capacity","authors":"M. Castañeda, A. Mezghani, J. Nossek","doi":"10.1109/WSA.2008.4475567","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475567","url":null,"abstract":"Recently, it has been shown that dirty paper coding (DPC) achieves the sum rate capacity of the Gaussian multi-user multiple-input single-output (MU-MISO) broadcast channel of a single isolated cell. However, when considering a multi- cell scenario, i.e., a cellular network, the optimal strategy to maximize the sum rate capacity in each of the cells is still unknown. Nevertheless, based on a game-theoretic framework DPC can be applied at each cell as a decentralized strategy in a cellular network, in order to maximize the sum broadcast capacity of the network. By treating the cells in the network as players in a strategic cooperative game, simultaneous iterative waterfilling can be performed, i.e., every cell computes its optimal beamforming vectors according to DPC and by considering the intercell interference generated in the previous iteration. At each iteration the beamforming vectors for each user in each cell are updated with the gradient projection algorithm in order to maximize the sum network broadcast capacity. The algorithm is repeated until it converges, i.e., a local maximum is achieved. This theoretic result approaches the maximum rate that can be transmitted in the downlink of a network. Additionally, in order to introduce some fairness into the network, we consider in a similar way as the previous problem, the task of minimizing the sum of the mean square errors of all the users in the network.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"3 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":"115394599","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: 13
Quality of service oriented spatial processing in the Manhattan grid 曼哈顿网格中面向服务质量的空间处理
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475583
Ulrike Korger, G. D. Galdo, A. Grosch, M. Haardt
{"title":"Quality of service oriented spatial processing in the Manhattan grid","authors":"Ulrike Korger, G. D. Galdo, A. Grosch, M. Haardt","doi":"10.1109/WSA.2008.4475583","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475583","url":null,"abstract":"In this paper, we investigate quality of service based MIMO spatial processing in the Manhattan scenario. To model the requirements arising from the individual users, we apply specific traffic and mobility models for metropolitan areas that represent user movement and service requirements in an adequate way. These demands result in an individual signal to interference and noise requirement that has to be fulfilled for each user on the physical layer. Thus, in a first step we analyze the interference among users on a 4-way junction on the downlink and show that it should not be ignored. Based on this observation, we propose the target SINR sensitive channel representative interference cancellation (TSS-CRIC) scheme. It groups the users in a street and calculates a channel representative. The latter, as a virtual user, reflects the spatial features of all users in the group. Moreover, it is tailored in such a way that the precoding computed on its basis achieves the individual Quality of Service requirements and is able to adapt itself as the users move through the scenario. These advantages justify the higher computational complexity compared to a scheme that achieves similar results with respect to pure interference suppression.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"35 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":"115318352","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
Conformal phased array with beam forming for airborne satellite communication 用于机载卫星通信的波束形成共形相控阵
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475580
H. Schippers, J. Verpoorte, P. Jorna, A. Hulzinga, A. Meijerink, C. Roeloffzen, R. Heideman, A. Leinse, M. Wintels
{"title":"Conformal phased array with beam forming for airborne satellite communication","authors":"H. Schippers, J. Verpoorte, P. Jorna, A. Hulzinga, A. Meijerink, C. Roeloffzen, R. Heideman, A. Leinse, M. Wintels","doi":"10.1109/WSA.2008.4475580","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475580","url":null,"abstract":"For enhanced communication on board of aircraft novel antenna systems with broadband satellite-based capabilities are required. The installation of such systems on board of aircraft requires the development of a very low-profile aircraft antenna, which can point to satellites anywhere in the upper hemisphere. To this end, phased array antennas which are conformal to the aircraft fuselage are attractive. In this paper two key aspects of conformal phased array antenna arrays are addressed: the development of a broadband Ku-band antenna and the beam synthesis for conformal array antennas. The antenna elements of the conformal array are stacked patch antennas with dual linear polarization which have sufficient bandwidth. For beam forming synthesis a method based on a truncated singular value decomposition is proposed.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"109 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":"115552204","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: 46
Modulation-mode and power assignment for MIMO-BICM schemes MIMO-BICM调制模式与功率分配
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475568
A. Ahrens, V. Kühn
{"title":"Modulation-mode and power assignment for MIMO-BICM schemes","authors":"A. Ahrens, V. Kühn","doi":"10.1109/WSA.2008.4475568","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475568","url":null,"abstract":"In this contribution we jointly optimize the number of activated MIMO layers and the number of bits per symbol along with the appropriate allocation of the transmit power under the constraint of a given fixed data throughput and integrity. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different signal constellations and mappings were used within a single codeword. EXIT charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"66 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":"123619044","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
Robust downlink SINR balancing based on MMSE optimal CSI feedback 基于MMSE最优CSI反馈的下行信噪比鲁棒均衡
2008 International ITG Workshop on Smart Antennas Pub Date : 2008-03-21 DOI: 10.1109/WSA.2008.4475560
P. M. Castro, M. Joham, W. Utschick, L. Castedo
{"title":"Robust downlink SINR balancing based on MMSE optimal CSI feedback","authors":"P. M. Castro, M. Joham, W. Utschick, L. Castedo","doi":"10.1109/WSA.2008.4475560","DOIUrl":"https://doi.org/10.1109/WSA.2008.4475560","url":null,"abstract":"A robust signal-to-interference-plus-noise ratio (SINR) design is proposed that is based on fed back channel state information (CSI). The channel estimator, the quantizer, and the rank-reduction basis are jointly optimized to get a minimum mean square error (MMSE) optimal CSI feedback. Based on the CSI feedback, the transmitter can compute the conditional covariance matrices of the different channels that enable a balancing of the different SINRs on average. The robust SINR balancing algorithm shows good balancing properties also for the instantaneous SINR and clearly outperforms the non-robust SINR balancing approach.","PeriodicalId":255495,"journal":{"name":"2008 International ITG Workshop on Smart Antennas","volume":"1 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":"126863494","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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