具有异构用户业务的分布式天线系统中的多用户MIMO传输

Long Gao, S. Gaur, J. Acharya
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引用次数: 2

摘要

在本文中,我们考虑了分布式天线系统下行链路中的多用户传输,其中有两种类型的用户:i)需要最小瞬时速率的实时用户和ii)试图最大化其速率的最佳努力用户。本文从一个实时用户和一个最优用户组成的双用户系统入手,在实时用户速率约束和天线功率约束下,提出了最优波束形成方案,以最大限度地提高最优用户的瞬时速率。然后提出了两种次优传输方案,分别降低了计算复杂度和反馈开销。此外,我们提出了一个基于循环的调度程序,将所提出的方案扩展到一般的多用户系统,从而使实时用户的中断概率最小化。系统级仿真结果表明,所提方案的性能优于两种参考方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiuser MIMO Transmission in Distributed Antenna Systems with Heterogeneous User Traffic
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.
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