{"title":"Multiuser MIMO Transmission in Distributed Antenna Systems with Heterogeneous User Traffic","authors":"Long Gao, S. Gaur, J. Acharya","doi":"10.1109/VETECS.2012.6240224","DOIUrl":null,"url":null,"abstract":"In this paper, we consider multiuser transmission in the downlink of a distributed antenna system with two types of users: i) the real-time users that require a minimum instantaneous rate and ii) the best-effort users that try to maximize their rates. We start with a two-user system consisting of one real-time user and one best-effort user, in which the optimal beamforming scheme is proposed to maximize the instantaneous rate of the best-effort user under the rate constraint of the real-time user and per-antenna-power constraint. Two suboptimal transmission schemes are then proposed to reduce the computational complexity and feedback overhead, respectively. Furthermore, we propose a round-robin based scheduler to extend the proposed schemes to a general multiuser system, such that the outage probability of the real-time users is minimized. System-level simulation results show that the proposed schemes have better performance than two reference schemes.","PeriodicalId":333610,"journal":{"name":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2012 IEEE 75th Vehicular Technology Conference (VTC Spring)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/VETECS.2012.6240224","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
In this paper, we consider multiuser transmission in the downlink of a distributed antenna system with two types of users: i) the real-time users that require a minimum instantaneous rate and ii) the best-effort users that try to maximize their rates. We start with a two-user system consisting of one real-time user and one best-effort user, in which the optimal beamforming scheme is proposed to maximize the instantaneous rate of the best-effort user under the rate constraint of the real-time user and per-antenna-power constraint. Two suboptimal transmission schemes are then proposed to reduce the computational complexity and feedback overhead, respectively. Furthermore, we propose a round-robin based scheduler to extend the proposed schemes to a general multiuser system, such that the outage probability of the real-time users is minimized. System-level simulation results show that the proposed schemes have better performance than two reference schemes.