一种新的频率选择性信道下V-BLAST检测算法  

A novel detection algorithm for V-BLAST over frequency-selective channels

作　　者：姜煜[1] 白兴宇[1] 陈万海[2] 

机构地区：[1]杭州应用声学研究所声呐技术国际科技重点实验室,浙江杭州310012 [2]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2007年第7期802-807,共6页Journal of Harbin Engineering University

摘　　要：针对频率选择性衰落信道,提出了一种新的基于判决反馈均衡的V-BLAST(垂直—贝尔实验室分层空时)检测算法.在算法中,提出了分段训练的概念,依据前段训练结束后,各层被检测信号的信噪比大小在反馈部分进行逐层递增反馈.该算法无需进行信道估计,无需对信道矩阵求逆,且能自适应信道变化.同时,相对于自适应多输入多输出判决反馈均衡算法,新算法的计算复杂度明显降低,且低信噪比条件下的误码率性能有所改善.仿真实验给出了新算法与自适应多输入多输出判决反馈均衡算法的性能对比,证明了新算法的有效性.This paper proposes a novel detection algorithm for V-BLAST over frequency-selective channels, using feedback based equalization decisions. In the algorithm, a type of segmented training is proposed whereby feedback is increased layer by layer according to the signal-to-noise ratio （SNR） in the detected signal of every layer when training in the previous stage finishes. The new algorithm requires neither channel estimation nor evaluation of in- verse channel matrices. Furthermore, it is able to adapt to channel changes. Compared to the adaptive MIMO DIrE （Multiple Input Multiple Output Decision Feedback Equalization） algorithm, the computational complexity of the proposed algorithm is dramatically less, and its bit-error rate （BER） performance in the case of low SNR is also better. Finally, a simulation compared the effectiveness of the proposed algorithm and the adaptive MIMO DIrE algorithm, proving the feasibility of the proposed algorithm.

关 键 词：频率选择性信道 垂直-贝尔实验室分层空时系统 多输入多输出系统 判决反馈均衡 

分 类 号：TN911.22[电子电信—通信与信息系统]