分布式MIMO系统中载波频偏和信道的EM - PF联合估计

摘要

考虑了平衰落背景下分布式MIMO系统中载波频偏和信道的联合估计问题.与集中式MIMO的联合处理方法不同,改进了EM算法,提出了EM - PF算法解决这一强非线性难题.仿真结果表明:改进的算法更逼近克拉美罗界,在高性噪比条件下,误码率更低,有很大的实用价值.%This paper considers the joint estimation of channel and carrier frequency offset in the context of distributed flat fading MIMO system. Compared with the estimation method for centralized MIMO system, this paper improves the EM algorithm and a novel EM-PF algorithm is proposed to overcome the nonlinear problem. The simulation results show that this improved method is more approximate the Cramer-Rao Bound,lowers BER under the high SNR condition and has great practical value.