STBC发射分集OFDM系统的一种低复杂度的信道估计

A Low-Complexity Channel Estimation for STBC-Based Transmitter Diversity OFDM Systems

针对空时分组编码(STBC)发射分集的多天线正交频分复用(OFDM)系统,文章提出一种新的、低复杂度的信道估计方法———正交-线性估计。该方法利用空时分组编码的复正交特性,将多个收发天线对的信道分离与估计问题简化为一线性变换问题,然后基于最小二乘准则(Least Square),完成信道估计器的设计。理论分析和仿真结果表明,和已有的LS信道估计方法相比,该方法能提供3dB性能改善。

In this paper a novel low-complexity channel estimator, which is called orthogonal-linear estimation, is proposed for STBC(Space Time Block Code)-based transmitter diversity OFDM systems. According to the complex orthogonal design in STBC, a simple linear process is done to identify the different channels' elements corresponding to different transmitter and receiver antenna pairs. Then, a (least-)square (LS) channel estimator with low complexity is made. Both analyses and computer simulations show that the proposed scheme can give about 3dB improvement over traditional LS estimators.