多序列跳频无线通信系统抗多音干扰性能研究

Performance of Multi-Sequence Frequency Hopping Wireless Communication System over Multi-Tone Jamming

常规跳频系统(FH-2FSK)发送的调制信号易被干扰损伤,提出的多序列跳频(MSFH)无线通信方式不需对载波进行调制,直接以载波频率来表示消息,且每跳所使用频点的随机性比FH-2FSK强.通过理论分析得到了加性白高斯噪声信道下存在多音干扰时MSFH系统误码率的闭合表达式,由数值和仿真结果可知,在信道中仅存在加性白高斯噪声时,MSFH与FH-2FSK误码率性能相同;在最坏多音干扰下,MSFH与FH-2FSK相比约有3dB误码率性能增益,抗多音干扰能力更强.

The modulated signal in conventional frequency hopping system （FH-2FSK） is vulnera- ble to jammings. To improve this,a multi-sequence frequency hopping （MSFH） wireless commu- nication scheme is proposed in this paper. In MSFH, there is no need to modulate the carrier, while the message is expressed directly by the carrier frequency. Moreover,the randomness of the frequencies used in each hop is improved than that in FH-2FSK. The BER expression of MSFH is obtained in a closed form over AWGN channel with multi-tone jamming. Numerical and simula- tion results indicate that,MSFH performs as well as FH-2FSK when the channel is AWGN-only; and when under the worst case multi-tone jamming,MSFH has a BER performance gain of 3dB a- gainst FH-2FSK,which validate the multi-tone jamming rejection capability of MSFH.