协作空分复用CSM系统中的信道估计算法研究

文章就当前MIMO应用过程中终端多天线受限制问题，阐述了单天线终端协作与基站组成虚拟MIMO多天线阵列——基于OFDMA的CSM协作空分复用系统结构。同时，提出对OFDMA系统中时频二维的资源进行分“块”独立进行信道估计，简化了OFDMA系统信道估计模型的复杂度。然后从应用的角度对比分析了基于OFDMA的CSM系统的信道估计算法LS和MMSE两种算法性能与优缺点。通过在PB3信道模型中仿真，得出适用于慢变信道的平滑滤波后的LS信道估计算法。

Channel Estimation Algorithms in Collaborative Spatial Multiplexing System

Limited by its size and transmit power, MIMO application on the subscriber station（MS） has become very difficult. This paper firs tells of a collaborative spatial multiplexing system（CSM） Two single Tx antenna MSs per-form collaborative spatial multiplexing onto the same subcarrier, composed with a two Rx antennas BS as a 2×2 multi antenna array based on OFDMA. Then proposes a new channel estimation algorithm, which divides OFDMA time-frequency 2-D resource into ＂blocks＂, each for a independent channel estimation, thus greatly reducing the complexity of channel estimation model. By Comparing the performances of LS and MMSE estimation algorithms in Pedestrian Channel B rnodel, an efficient smoothly filtered LS channel estimation method suitable for slow-varying channel is obtained.