分集接收技术主要用于解决无线传输过程中的信号衰落, 无线接收时的邻频干扰、同频干扰等问题, 能够有效改善接收信号的质量。针对分布式平台上多通道接收信号同步与分集合并算法进行研究, 提出一种适用于不同调制类型的多通道信号合并前同频同相调整方法, 并对合并前各通道信号进行信噪比估计,以确定最大比合并时的权重。经理论分析可知, N通道信号最多可获得10lgN dB的合并增益。仿真验证结果与理论分析一致, 证明了算法的有效性和可行性。

Diversity receiving technology is mainly used to solve the problems such as signal fading during wireless transmission, adjacent channel interference and co-channel interference during wireless reception, which can improve the quality of received signal effectively. This paper studies the multi-channel receiving signal synchronization and diversity combining algorithm on distributed platform, and then proposes a method for multi-channel signal pre-synchronization in-phase adjustment for different modulation types. In order to determine the weight of the maximum ratio combining, the paper estimates the Signal-to-Noise Ratio(SNR) of each channel before the merger. According to theoretical analysis, the maximum combined gain that can be obtained for the N-channel signal is 10lgN dB. The results of simulation are consistent with theoretical analysis, which proves the effectiveness and feasibility of this algorithm.