AN辅助的WFRFT抗截获通信优化设计

Anti-interception Communication Technology Based on WFRFT and Artificial Noise

针对卫星通信安全性不高、易被截获的问题,提出一种加权类分数阶傅里叶变换(WFRFT)与人工噪声(AN)辅助技术相结合的抗截获通信技术。选择合适的AN功率占比,使得合法接收方性能衰减小于1dB。在此基础上,分析调制阶数α对系统的误码率性能与安全容量的影响,对WFRFT的调制阶数进行优化设计,选择合适的调制阶数,窃听方在已知调制阶数的具体值,SNR为15dB时,误码率为0.0024,同时,SNR为20dB时,系统的安全容量为5.771(bit·s^-1)/Hz,系统的抗截获性得到了极大提高。

This paper proposes a new kind of anti-interception communication technology based on weighted-type fractional Fourier transform(WFRFT)and artificial noise(AN).By selecting the appropriate power ratio,the performance degradation of legal receiver is less than 1 dB.Based on this,the influence of modulation order on the BER performance and security capacity of the system is analyzed and the selection of the modulation order of WFRFT is optimized.Selecting the appropriate modulation order,on the condition that the eavesdropper knows the specific value of the modulation order,when the SNR is 15 dB the error rate of the eavesdropper is 0.002 4 and the system’s security capacity is 5.717(bit·s^-1)/Hz when the SNR is 20 dB.The system’s anti-interception has been greatly improved.