两跳中继分布式预编码码字选择方案

针对两跳分布式预编码MIMO中继系统,为了克服码字选择复杂度较高的缺点,提出一种基于单跳信道右奇异特征向量反馈的最小距离准则码本选择策略。首先给出基于均方误差矩阵的两跳分布式预编码设计方法,选取单跳信道右奇异特征向量作为反馈量,利用RVQ码本对其量化,最后采用最小距离准则对码字进行选择。仿真结果表明,在反馈比特数目相同的情况下,得到的系统BER性能与现有算法相近,但系统的和速率性能优于已有算法,且计算复杂度降低大约一半。

Dual-Hop Relay Distributed Precoding Codeword Selection

For overcoming the drawback of high complexity of codeword selection in the dual-hop distributed precoding MIMO relay system,the codeword selection strategy based on the feedback of right singular eigenvector of each hop channel is proposed.Firstly,the dual-hop distributed precoding matrix based on the mean square error（MSE） is given,and the RVQ codebook is used to quantize the right singular eigenvector,and finally the minimum distance criterion is adopted to select the codeword.Simulation results show that when the number of feedback bits are identical,the BER performance of the system is approximate to that of the existing algorithm,but the sum-rate performance of the system is slightly better than that of the existing algorithm,while the computational complexity is reduced by half.