数字通信系统相位均衡滤波器的FPGA实现

FPGA implementation of filter with phase equalizer in digital communication system

为校正数字信号传输中的相移畸变,针对CDMA通信系统基带到射频输出部分,设计一种基于FPGA实现的相位均衡滤波器。该滤波器由反馈延迟、查找表、加法器和解复用输出模块组成。仿真结果表明,该滤波器符合全通均衡滤波器的特性,可较好地修正相移畸变,节省FPGA资源。该相位均衡滤波器实现方法可应用于数字通信系统。

This paper proposes a FPGA-based phase equilibrium filter designed to correct phase distortion in the digital signal transmission occurring between baseband and radiofrequency output in CDMA communication system. The filter is composed of feedback delay, lookup tables, adder and demuhiplexer output module. The simulation shows that this filter, consistent with characteristics of all-pass equalization filter, enables a better rectification of the distortion on phase-shift and economy in the FPGA resources. The filter can find application in the digital communication system.