空间相关莱斯衰落信道下基于部分信道信息的多用户预编码与调度算法
doi: 10.3724/SP.J.1146.2007.01189
Multi-user Precoding and Scheduling Algorithm for Spatial Correlation-Aided Ricean Fading Channel with Partial CSI
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摘要: 在空间相关的莱斯衰落信道模型下，针对多用户MIMO(Multiple-Input Multiple-Output)系统潜在的多用户分集增益和空间分集增益，该文提出了一种基于部分信道信息的多用户预编码与调度算法。结合部分瞬时信道信息和统计信息，利用约束最大似然估计对各用户信道矢量进行估计，然后利用估计的各用户信道调度多个用户进行预编码。仿真结果表明，该方案以较少的反馈开销，获得了较大的性能增益。Abstract: In order to exploit multi-user diversity gain and spatial multiplexing gain for multi-user MIMO (Multiple-Input Multiple-Output) system with spatial correlation-aided Ricean fading channel, a joint multi-user precoding and scheduling algorithm is proposed based on partial Channel State Information (CSI). Utilizing partial instantaneous CSI and statistical CSI for all users, the Base Station (BS) estimates the channel for each user using Constrained Maximum Likelihood (CML) approach, and then schedules a group of users with optimal precoding using the estimated channels. Simulation results demonstrate that the proposed scheme greatly improves system throughput with a bit of feedback overhead.
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