基于短波多径信道的复判决反馈均衡器的改进

The Improvement of Complex Decision Feedback Equalizer on Multi-path Fading HF Channels

在平方根卡尔曼复判决反馈均衡器原理的基础上,针对短波信道经常存在的多径在前主径在后的情况,对应用于短波高速数据传输的均衡器进行了结构上的改进,不立刻对输入均衡器的码元进行判决,而是延迟一定码元时间后再进行判决。MATLAB仿真结果表明,进行延迟判决的均衡器在既不影响均衡器的收敛速度,且算法复杂度增加很少的前提下,比常规结构的复判决反馈均衡器在抗干扰性能上有很大提高。

This paper deals with the complex adaptive decision feedback equalizer （DFE） using square root Kalman algorithm. When the multi -path signal arrives ahead of the main -path signal, which often occurs in HF channel, an improvement is made to achieve better error - rate performance without slowing the convergence rate or increasing largely the complexity of the algorithm. That is, have the input signal decision delayed instead of decision immediate. Computer simulation using MATLAB indicates that the improved DFE is better than normal DFE on multi -path fading HF channels.