直接盲MMSE均衡算法在散射通信中的仿真研究

Study and Simulation of Direct Blind MMSE Equalization in Troposcatter Communication

多径效应造成的符号间干扰是大容量散射传输所遇到的首要问题。根据文献中提出的基于二阶循环统计量的直接盲均衡算法,依据最小均方误差准则,对接收到的信号进行过采样,构造了一个线性的分数间隔均衡器,并用它来均衡对流层散射信道,获得了较好的均衡效果。由于该算法不经过信道盲辨识而直接均衡信道,因此受信道阶数误差的影响较小,且该算法与传统的基于二阶矩的两步均衡算法相比,具有计算简单,精度高的特点。

The intersymbol interference （ISI） caused by multipath effect has been a principal problem i the large capacity troposcatter communication. According to the minimum mean-square error criterion, the receive signal is over sampled and the direct blind equalization algorithm based on second-order cyclic statistics propose in this paper. A linear fractionally spaced equalization is constructed and used in the troposcatter channel and the better equa]ization resu]t is acquired in the simulation. Because this algorithm directly equalizes th channel without b]ind channel identification, the effect resulted from the error of channel order would be small Moreover, compared to the conventional two-step equalization algorithm based on the second-order statistics, thi algorithm is of more simplicity and higher precision.