A Novel Linear Precoding Based on Limited Feedback for MIMO Systems
It’s well known that the dominant subspace of the time-varying channel matrix for MIMO system can be treat as a point in Grassmann manifold. The beamforming using Grassmannian subspace packing (GSP) codebook is based on this view, which feedback the index of the codeword for a limited feedback. But if there is channel time-domain correlation, GSP scheme can not utilize the correlation. A scheme can utilize the correlation for subspace tracking: 1bit feedback scheme quantize the geodesic trajectory connecting two subspaces to reduce the feedback bits number. But the convergence speed of this scheme constraint the performance of 1 bit feedback scheme. So we propose a new beamforming algorithm, which extracts advantages of both schemes, reduces the feedback rate and enhances the system performance. Simulation results show that the new algorithm has a better performance than GSP scheme with the same feedback bits number, and solve the problem of the performance descend for 1bit feedback scheme.
Peng Dong Wanbin Tang Lian Wang
National Communication Laboratory, UESTC, Chengdu, Sichuan, China Ertan Hydropower Development Company, Ltd
国际会议
2009国际通信电路与系统学术会议(ICCCAS 2009)(2009 International Conference on Communications，Circuits and Systems)
成都
英文
14-18
2009-07-23（万方平台首次上网日期，不代表论文的发表时间）