跳频OFDM系统的相位抖动补偿算法

跳频OFDM(FH-OFDM)系统中的相位抖动模型与定频系统有着本质不同。本文首先分析了多径衰落信道条件下FH-OFDM系统在相位抖动污染情况下的信噪比损失和误码性能,然后根据相位抖动信号的频域特征,提出了一种基于最小二乘(LS)逆滤波器设计原理的相位抖动补偿(PJC)算法。分析与仿真结果表明,选择合适的滤波器长度,该算法可以在不降低系统带宽有效利用率的前提下有效改善系统误码性能。

Compensation of Phase Jitter in Frequency Hopped OFDM Systems

The phase jitter of Frequency hopped OFDM systems (FH-OFDM) is very different from that of normal OFDM sys- tems.In this paper the SNR loss and BER performance are analyzed for the system ruined by the phase jitter in the multipath fading channel.Based on the analysis on the frequency domain specification of phase jitter signal,a phase jitter compensation (CPJ) algorithm is also presented which is based on the design principle of inverse filter.Least square (LS) approach is used to exploit the phase jitter information existing in the scattered pilots.Analysis and simulation results show that choosing an appropriate length for the filter the algo- rithm can improve the BER performance effectively,which will not reduce the system bandwidth availability.