摘要
正交频分复用(OFDM)系统常常利用循环前缀来进行定时同步和频偏估计。研究了最大似然同步算法,分析了同步算法的原理,提出了利用单音和多音信号来干扰系统同步,并对干扰造成的定时误差和频偏估计误差对正确解码的影响进行了分析。仿真结果表明以较小的干扰信号功率能够对系统同步取得明显的效果。
The cyclic prefix is offen used for timing synchronization and frequency departure estimation in orthogonal frequency-division multiplexing（OFDM）system.This paper studies maximum likelihood synchronization algorithm,analyzes the principle of synchronization algorithm,brings forward the method using single-tone signal and multi-tone signal to jam the synchronization of systems,analyzes the influence of timing error and frequency departure estimation error caused by jamming on correct decoding.Simulation results show that a low power of jamming signal can jam the system synchronization obviously.
出处
《舰船电子对抗》
2015年第1期54-57,83,共5页
Shipboard Electronic Countermeasure
关键词
正交频分复用
定时同步
频偏估计
单音干扰
多音干扰
正确解码
orthogonal frequency-division multiplexing
timing synchronization
frequency departure estimation
single-tone jamming
multi-tone jamming
correct decoding
