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2011 International ITG Workshop on Smart Antennas最新文献

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On the capacity of a class of multi-user interference channels 一类多用户干扰信道的容量
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741946
A. Chaaban, A. Sezgin
{"title":"On the capacity of a class of multi-user interference channels","authors":"A. Chaaban, A. Sezgin","doi":"10.1109/WSA.2011.5741946","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741946","url":null,"abstract":"Two multiuser interference networks are considered. The first setup is the interfering multicast network, and the second is the cyclic interference channel. The interfering multicast network is a setup with two multicast channels using the same medium. The multicast channels interfere with each other. The sum capacity in the noisy interference regime, and the capactiy in the strong interference regime are established. It is shown that the interfering multicast network has strong interference for a larger set of channel parameters than what was previously obtained. The cyclic interference channel is a setup where each transmitter causes interference only to its neighboring receiver. Its capacity with strong interference is obtained. The noisy interference regime is also given as an extension of previous work in the fully connected interference channel.","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":"133268231","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
Symmetric capacity of multi-user MIMO downlink under per-base station power constraints 每个基站功率约束下多用户MIMO下行链路的对称容量
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741924
Tarik Akbudak, M. Simsek, Bo Zhao, A. Czylwik
{"title":"Symmetric capacity of multi-user MIMO downlink under per-base station power constraints","authors":"Tarik Akbudak, M. Simsek, Bo Zhao, A. Czylwik","doi":"10.1109/WSA.2011.5741924","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741924","url":null,"abstract":"We consider a multiuser multiple-input multiple output (MIMO) Gaussian broadcast channel (BC). Assuming a sum-power constraint over all transmit antennas, the sum capacity of such a system can be achieved with dirty paper coding (DPC) which has been found as a very promising strategy. Rather than the usual sum-power constraint, in this paper we focus on the downlink of a cooperative multicellular network where each transmit antenna has an individual power constraint. This scenario is much more realistic than the case where a sum power constraint is considered, since in practical systems transmit antennas have their own power amplifiers. We extend this approach to the scenario where each base station (BS) is assumed to have an individual power constraint. We propose a capacity calculation algorithm which is able to take both per-BS and per-antenna power constraints into account.","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":"129118535","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
Packet detection and frequency synchronization with antenna diversity for IEEE 802.11p based on real-world measurements 基于实际测量的IEEE 802.11p天线分集的分组检测和频率同步
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741934
G. Maier, A. Paier, C. Mecklenbräuker
{"title":"Packet detection and frequency synchronization with antenna diversity for IEEE 802.11p based on real-world measurements","authors":"G. Maier, A. Paier, C. Mecklenbräuker","doi":"10.1109/WSA.2011.5741934","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741934","url":null,"abstract":"We apply and extend the packet detection and frequency synchronization technique by Schmidl and Cox to a multi-antenna receiver for Wireless Access in Vehicular Environments (WAVE) according to IEEE 802.11p. We investigate the resulting performance enhancements due to the use of multiple antennas from recently carried out real-world experiments in vehicular scenarios. The evaluation shows that the amount of detected frames can be increased by up to 27 %, if two receive antennas and an appropriate combining scheme, for the whole synchronization process, is used.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"6 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":"122280513","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
Opportunistic resource allocation in mimo cognitive systems with multiple users 多用户mimo认知系统中的机会性资源分配
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741931
C. Huppert
{"title":"Opportunistic resource allocation in mimo cognitive systems with multiple users","authors":"C. Huppert","doi":"10.1109/WSA.2011.5741931","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741931","url":null,"abstract":"We propose opportunistic transmission methods exploiting spatial holes in multi antenna systems with a cognitive multiple access or broadcast channel. The proposed methods determine a precoding matrix for each cognitive transmitter as well as a post processing matrix for each cognitive receiver. For both, the pre as well as the post processing step different strategies are given. With the help of these matrices the cognitive system can be described by an equivalent non cognitive multiple user system. This equivalent systems reveals the multiplexing gain of the considered cognitive scheme and allows for determining the achievable sum rate of the cognitive users by applying multi user waterfilling.","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":"128563093","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
Multiuser diversity with limited feedback 反馈有限的多用户多样性
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741929
M. Castañeda, J. Nossek
{"title":"Multiuser diversity with limited feedback","authors":"M. Castañeda, J. Nossek","doi":"10.1109/WSA.2011.5741929","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741929","url":null,"abstract":"Multiple antennas at the base station can be employed to serve multiple single-antenna users in the downlink of a system. When the number of active users K is larger than the number of transmit antennas M, the base station can exploit multiuser diversity by cleverly scheduling a set of M users. For this purpose, the base station needs to know the downlink channel state information of all the users in the system. In a frequency division duplex (FDD) system, this is attained with limited feedback from the users. Albeit most of the literature assumes a per-user limited feedback, a system limited feedback is actually more appropriate. Given a constraint on the total amount of airtime available for feedback, in this work we are interested in determining the optimum number of users that should feed back. We observe a tradeoff between the attainable degree of multiuser diversity and the feedback quality. The users are scheduled based on minimizing the sum of the mean square error (MSE) for the selected set of users.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"2 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":"127627018","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
How much training is needed for interference coordination in cellular networks? 蜂窝网络的干扰协调需要多少训练?
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741928
H. Brunner, M. Castañeda, J. Nossek
{"title":"How much training is needed for interference coordination in cellular networks?","authors":"H. Brunner, M. Castañeda, J. Nossek","doi":"10.1109/WSA.2011.5741928","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741928","url":null,"abstract":"Cooperative techniques for cellular networks promise very high data rates, but require additional and precise knowledge of the serving and interference channels. We show, how the pilot symbols required for achieving this information affect the possible data rates. The measurements of the channels are suffering from pilot contamination, due to the measurements in adjacent cells. On the one hand, with a too short pilot length, cooperation is not possible and the channels are learned too poorly, degrading the possible data rates. On the other hand, a too long pilot length reduces the efficiency of the system, leaving no resources for the data transmission. In addition, the channel measurements are outdated before they can be applied. With an upper bound to the sum rate of a system with interference coordination and a sub-optimal pilot allocation strategy, we discuss the pilot length trade-off.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"28 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":"114738890","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
Computing upper bounds for coordinated multipoint transmission in small networks 小型网络中协调多点传输的上界计算
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741933
W. Utschick, A. Brack
{"title":"Computing upper bounds for coordinated multipoint transmission in small networks","authors":"W. Utschick, A. Brack","doi":"10.1109/WSA.2011.5741933","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741933","url":null,"abstract":"Coordinated beamforming for intercell interference management in multicell networks is considered. The base stations are equipped with multiple antennas, while the mobile terminals only have a single antenna. The base stations perform beamforming, user group selection, and scheduling operations. A mobile terminal can be served from multiple base stations, which requires advanced receiver techniques, whereas remaining intercell interference is treated as noise. The corresponding resource allocation problem is cast as a utility maximization problem. After a suitable reformulation, the problem can be solved to global optimality using a monotonic optimization method. The proposed framework allows computing benchmarks for certain scenarios, utility functions, and cooperation strategies.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"41 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":"116515535","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
Stochastic transceiver design in point-to-point MIMO channels with imperfect CSI 具有不完全CSI的点对点MIMO信道随机收发器设计
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741935
Andreas Gründinger, M. Joham, W. Utschick
{"title":"Stochastic transceiver design in point-to-point MIMO channels with imperfect CSI","authors":"Andreas Gründinger, M. Joham, W. Utschick","doi":"10.1109/WSA.2011.5741935","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741935","url":null,"abstract":"The problem of stochastically robust minimum mean square error (MMSE) transceiver design is addressed for multiple-input multiple-output (MIMO) point-to-point channels with different imperfect channel state information (CSI) at the receiver and the transmitter. While the receiver has distribution knowledge of the doubly correlated Gaussian channel that is conditioned on pilot-based training observations (partial CSIRx), the transmitter has either conditional distribution knowledge about the receiver's observations based on feedback (partial CSITx), or only unconditioned distribution knowledge (statistical CSITx). In case of partial CSITx, the design is based on an alternating optimization of the transmit and receive filter. For statistical CSITx, a novel closed-form expression for the expected MMSE is calculated and the structure of the optimal precoder is determined. This enables us to employ an efficient gradient projection method for the robust precoder design.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"127 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":"122978276","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
Analytical investigation of two-object DOA estimation 双目标DOA估计的分析研究
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741939
P. Häcker, Bin Yang
{"title":"Analytical investigation of two-object DOA estimation","authors":"P. Häcker, Bin Yang","doi":"10.1109/WSA.2011.5741939","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741939","url":null,"abstract":"Current automotive radar systems measure the distance, the relative velocity and the direction of objects in their environment. This information enables the car to support the driver. When objects cannot be completely separated by their distance or relative velocity, a two object direction of arrival estimator must normally be used to separate the objects. In this paper we take a close look at the Cramér-Rao bound of the two-object estimation problem. We show the influence of the objects' phase difference and their signal power. Furthermore, criterions are introduced, which can be used to optimize the average direction estimation performance of an antenna array. It turns out that there are array and angle combinations which are more sensitive to phase difference changes than others.","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":"128671563","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
Diversity spectra of dense antenna arrays 密集天线阵列的分集谱
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741910
H. Schulze
{"title":"Diversity spectra of dense antenna arrays","authors":"H. Schulze","doi":"10.1109/WSA.2011.5741910","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741910","url":null,"abstract":"We analyse the spatial diversity of dense antenna arrays in the plane and show how it can be characterised by the eigenvalue spectrum of the spatial autocorrelation kernel. We show how this diversity spectrum can be calculated for any spatial fading statistics represented by the power azimuth spectrum (PAS). Numerically calculated diversity spectra provide estimates of the possible diversity gains of the system and help to optimise the geometry of an antenna array.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"20 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":"128815832","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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