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为了提高中继协作网络中信息传输的可靠性,提出了基于最大比合并的速率最大化空间信道配对的方案.该方案包括3个步骤:信道相位消除、最大比合并和空间信道配对.将该方案建模为凸优化问题,优化的目标函数是最大化传输速率,优化变量为每个用户上行链路的空间子信道与其相应的下行链路的空间子信道的配对策略.采用排序不等式定理推导并获得了该优化问题的最优空间信道配对解的近似闭合表达式.仿真结果表明,相比于已有的分布式空时分组码和相干合并的方法,所提出的基于空间信道配对的最大比合并算法的符号误码率性能在中、高信噪比区间获得了明显的提高,此性能的提高归功于所提方法充分利用了空间信道配对增益.
In order to improve the reliability of information transmission in relay cooperative networks, a scheme of maximizing spatial channel matching based on maximal ratio combining is proposed, which includes three steps: channel phase elimination, maximum ratio combining and spatial channel matching. The scheme is modeled as a convex optimization problem, and the objective function of optimization is to maximize the transmission rate, and the optimization variable is the pairing strategy of each user uplink spatial sub-channel and its corresponding downlink spatial sub-channel. And obtain the approximate closed expression of the optimal spatial channel pairing solution of the optimization problem.The simulation results show that the proposed space-paired-based spatial channel pairing is the best one when compared to the existing distributed space-time block codes and coherent merging methods, The performance of the symbol BER compared with that of the combined algorithm has been significantly improved in the mid-to-high SNR range. The improvement of this performance is attributed to the fact that the proposed method makes full use of spatial channel matching gain.