Turbo-OFDM系统中的自适应均衡算法

摘要

为减少Turbo-OFDM(正交频分复用)系统中的载波间干扰和符号间干扰,提出一种基于频率优化和反馈滤波的均衡算法.该算法在目标误码率下,通过功率的优化配置,关闭无效的子带.利用零、极点抵消原理,通过自适应地选择级联反馈滤波器缩短信道冲激长度,从而降低Turbo码均衡算法的复杂度和OFDM的循环长度,提高频谱利用率.%An algorithm based on the power allocation and feedback filter is developed to reduce Inter-Carrier Interference(ICL) and Inter-Sign Interference(ISL) of Turbo-OFDM(Orthogonal Frequency Division Multiplexing) system.The algorithm, closes the inefficacy sub-band by power optimization, and reduces the length of channel impulse response by chosen feedback filters.It can simple the equalization of Turbo codes and reduce the length of CP, simulation results show that the algorithm perfects the frequency efficiency and has better performance than Turbo-OFDM system.