抗跟踪干扰的多序列跳频无线通信系统

摘要

The conventional slow-hopping-rate frequency-hopping/frequency-shift-keying (FH/FSK )is threatened by follower jamming (FJ).On the other hand,the differential frequency hopping (DFH)can resist FJ efficiently,but its bit error rate rises significantly under partial band jamming (PBJ).To enhance the FJ re-jection capability of the slow-hopping-rate FH/FSK without the expense of PBJ rejection capability,the pro-posed multi-sequence frequency hopping (MSFH)mode makes the data channel and the complementary channel hop on their respective frequency sequences,which will lure the follower jammer out of aiming at the comple-mentary channel,thus mitigating the effect of FJ.Besides,the narrow-band front end is employed in the MSFH receiver,which will resist PBJ more efficiently than the wide-band receiver of DFH.In the Rayleigh fading channel,the anti-jamming performance of the convolutional coded MSFH is evaluated.Numerical and simula-tion results show that,the MSFH generally outperforms FH/FSK by 5~10 dB when under the worst-case FJ, and also outperforms DFH notably when under PBJ.%常规慢速频移键控跳频(frequency-hopping/frequency-shift-keying,FH/FSK)受跟踪干扰威胁严重；差分跳频抗跟踪干扰能力强,但部分频带干扰下误码率高。为提高常规慢速跳频抗跟踪干扰性能,同时不损失抗部分频带干扰性能,提出的多序列跳频(multi-sequence frequency hopping,MSFH)无线通信方式中,数据信道和补偿信道频率分别按不同跳频序列跳变,使干扰方无法准确跟踪补偿信道,减少了跟踪干扰影响；而接收机射频前端采用窄带接收,与差分跳频的宽带接收相比可有效抑制部分频带干扰。在瑞利衰落信道下,分析了卷积编码MSFH 抗干扰性能。数值和仿真表明,在最坏跟踪干扰下 MSFH 比常规跳频约有5~10 dB 误码率性能增益,且抗部分频带干扰性能优于差分跳频。