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针对多天线放大转发中继系统,本文提出了一种基于MMSE的新的重传预编码方案,把重传预编码设计问题分解成两个子问题:离散的信道配对和连续的联合源、中继功率分配问题.最优的信道配对需要遍历所有信道配对方式,对于每一种配对方式,联合源、中继功率分配问题是一个多参数非凸的优化问题,本文提出了一种获得该问题最优解的算法和一种次优迭代功率分配算法,此种通过遍历信道配对获得最优重传预编码的方案计算复杂度较高.本文证明了在一跳信道信噪比趋于无穷时,最优的信道配对是使之前的子信道增益和当前另一跳信道奇异值大小排列顺序相反,进而提出了一种简化的信道配对方法.仿真结果表明,简化的信道配对和迭代功率分配算法性能均接近最优.本文所提出的重传预编码与已有的预编码相比,能获得明显性能提升.
In this paper, a new retransmission precoding scheme based on MMSE is proposed in this paper to decompose the retransmission precoding design problem into two sub-problems: discrete channel pairing and continuous joint source and relay For the optimal channel pairing, all channel pairing modes need to be traversed. For each pairing mode, the joint source and relay power allocation problem is a multi-parameter non-convex optimization problem. In this paper, Optimal solution algorithm and a suboptimal iterative power allocation algorithm.This scheme has high computational complexity by traversing the channel pairings to obtain the optimal retransmission precoding.This paper proves that when the SNR of one-hop channel approaches infinity, The optimal channel pairing is to make the previous subchannel gain reverse to the current order of the other channel hopping singular values, and then a simplified channel pairing method is proposed. The simulation results show that the performance of simplified channel pairing and iterative power allocation algorithm Are close to the best.The proposed retransmission precoding proposed in this paper can get obvious performance improvement compared with the existing precoding.