短波FH/OFDM通信系统抗跟踪式干扰性能分析

对于短波多载波跳频通信系统，跟踪式干扰是一种有效的干扰模式。分析了正交频分复用( OFDM)部分子信道干扰与符号误码率的关系，通过仿真获得了最佳跟踪干扰的部分时间参数，结合OFDM频谱结构与干扰频谱关系，推导了高斯信道条件下部分频带干扰和多音干扰时系统误码率，分析了短波FH/OFDM通信系统抗跟踪式干扰的误码率性能，仿真结果表明：跟踪干扰时间窗口对误码率的影响与部分频带干扰因子和信干比有关；在部分频带干扰与部分时间干扰之间，存在等效的干扰效果区域；多音干扰因子越大，系统所受影响越大，跟踪干扰时间窗口对误码率的影响与多音干扰因子和信干比有关，针对OFDM符号的多音干扰影响要远大于部分频带干扰的影响；跳频与OFDM技术的结合、提高载波跳速、减小跟踪式干扰对OFDM符号的影响，也是消除多音干扰的重要手段。

Tracking interference suppression performance analysis of shortwave FH/OFDM communication system

Tracking interference is an effective interference patterns for a shortwave multi-carrier frequency-hopping(FH) communication system.In this paper,the relationship between sub-channels interference and orthogonal frequency division multiplexing(OFDM) symbol error rate is analyzed,and the part time parameters of best tracking interference are obtained by simulation,the system bit error rate(BER) in partial band jamming and the multi-tone interference is derived under Gaussian channel according to the relationship between OFDM spectrum and interference spectral,and the BER performance of anti-tracking interference is analyzed.Simulations show that:the BER is related not only with the tracking interference time window,but also with the partial-band interference factor and signal to interference ratio;there is interference equivalent region between the partial-band interference and the part-time interference;when the factor of multi-tone jamming is greater,the effect of the time-window on system is greater,the BER is related not only with the tracking interference time window,but also with the multi-tone interference factor and signal to interference ratio,and the effect of multi-tone interference on OFDM symbol is more critical than that of partial band interference;by combining FH and OFDM,increasing the carrier FH rate and reducing the impact of tracking interference on OFDM symbols,multi-tone interference can be eliminated effectively.