VS-CMA盲均衡算法在短波数据通信中的应用研究

Research on the Application of VS-CMA Blind Equalization Algorithm in HF Data Communication

在美军标MIL-STD-188-110B基础上,改进短波（HF）数据通信发送端数据流结构,以便接收端对信号进行盲均衡处理。基于8PSK调制信号的峰度为恒定值的统计特性,提出采用均衡输出信号的峰度与理想信号的峰度差异,以调整恒模算法（CMA）的步长因子;并针对国际电联推荐的短波信道参数,进行了算法的性能仿真。仿真分析表明该算法对慢衰落的短波信道具有较好的均衡效果,对快衰落信道的均衡能力有限;应对快速衰落信道,算法还有待进一步改进。

Based on MIL-STD-188-110B, the transmitting data stream structure of HF data communication, which was convenient for blind equalization processing for receiving data, was ameliorated. It was proposed to adjust the step size of constant modulus algorithm （CMA） based on the kurtosis difference between the equalization output signal and ideal signal, the kurtosis which was constant for 8PSK modulation. And in allusion to HF channel parameter recommended by ITU, the performance the algorithm was simulated. The simulation exhibited that the algorithm had wonderful equalization performance for slowly fading HF channel, but it had little effect for rapid fading HF channel. The algorithm needs improvement for rapid fading HF channel.