一种基于盲均衡的多径环境下调制识别算法

针对频率选择性多径衰落信道下MPSK和MQAM信号的调制分类问题,提出了一种基于盲均衡算法的自动识别算法。将接收到的码元星座图通过一组并行的自适应盲均衡器,当盲均衡器与星座图匹配时其代价函数收敛到最小。所以直接利用盲均衡的代价函数作为调制识别特征,当代价函数收敛后,将具有最小代价函数值的均衡器所对应的信号判为识别结果。仿真结果表明,该算法可以有效识别频率选择性多径衰落信道下的BPSK,QPSK,8PSK,16QAM,32QAM,64QAM信号。

A blind equalization based algorithm of modulation identification in multipath channel enviroments

In this paper, a new algorithm based on blind equal- ization is proposed for identification of MPSK and MQAM sig- nals in frequency selective multipath fading channel. By the use of a set of parallel adaptive blind equalizers, the cost functions of equalizer matched to the received symbol constellation con- verges to the minimum. This method exploits the cost functions of the finally convergent matched equalizers as identification fea- tures. Simulation results show that the method is feasible and effective for identification of BPSK, QPSK, 8PSK, 16QAM, 32QAM, 64QAM signals in frequency selective multipath fading channel environments.