基于仿射投影算法的信道均衡器研究

摘要

为了克服信号传输中码间干扰影响,改善通信质量,研究了基于仿射投影算法(APA)的信道均衡系统.设计APA均衡器的关键是确定步长因子和滤波器长度,使系统的误码率最低.首先根据其性能仿真曲线可以得到一组最优的参数值,然后构建SIMULINK仿真平台进行验证,并和LMS及NLMS均衡器作对比.结果表明APA均衡器是有效的,并能在信道失真较严重的场合保持一定的性能.%To overcome Inter Symbol Interference (ISI) during data transmission and to improve communication quality, the paper studies on the channel equalizer with Affine Projection Algorithms ( APA ). The key to designing an APA equalizer is defining its step size value and filter length value to minimize the system Bit Error Rate (BER). Firstly an assembly of optimal coefficients are judged by the performance emulation curve; then SIMULINK emulation platform is established to verify it, and compare it with LMS and NLMS equalizers. The results demonstrate the APA equalizer is effective and able to maintain moderate performance on occasions with badly anamorphic channels.