频率选择性衰落信道中一种低复杂度的正交空时分组码译码算法

A Low Complexity Decoding Algorithm for Orthogonal Space Time Block Codes in Frequency Selective Fading Channels

针对正交空时分组码在频率选择性衰落信道中正交性被破坏的问题,该文提出了一种基于干扰对消的译码方案。该方案借鉴D-BLAST系统的检测方法,采用干扰抵消和干扰置零方法消除多径干扰,从而有效地检测出期望信号。理论分析和系统仿真表明,与迭代干扰抵消算法相比,该译码方案在有效地改善系统误码性能的同时,降低了译码复杂度,尤其适用于信道阶数较小的环境。

Focusing on the problem that the orthogonality of Orthogonal Space-Time Block Codes （OSTBC） in frequency-selective fading channels is destroyed, a novel decoding scheme based on interference cancellation is proposed. This scheme adopts interference cancellation and interference hulling to cancel multipath interference, which is used in D-BLAST system. Thus the expected signals are detected effectively. Theoretical analysis and simulation result show that, compared with iterative interference cancellation decoding algorithm, this scheme can improve the bit error rate efficiently and reduce the decoding complexity at the same time. The proposed sheme is especially suitable for environments with small rank of channels.