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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。
To overcome the shortcomings of high complexity of codeword selection for two-hop distributed precoding MIMO relay system, a minimum distance criterion codebook selection strategy based on right singular eigenvector feedback of single hop channel is proposed. Firstly, a two-hop distributed precoding design method based on mean square error matrix is given. The right singular eigenvector of single hop channel is selected as the feedback value, which is quantized by RVQ codebook. Finally, the minimum distance criterion is used to select the codeword. The simulation results show that the system BER performance is similar to the existing algorithms when the number of feedback bits is the same, but the system performance is better than the existing algorithms and the computational complexity is reduced by about half.