摘要
针对卫星通信安全性不高、易被截获的问题,提出一种采用加权类分数阶傅里叶变换(WFRFT)与多入多出(MIMO)技术相结合的卫星抗截获通信系统。系统采用多层WFRFT调制信号,WFRFT的层数与发射天线数目相同,每层WFRFT采用不同的调制阶数。原始信号经WFRFT调制后具有时频域特性,能有效抵抗参数扫描,MIMO能有效提高频谱利用率及系统容量。经理论分析,采用WFRFT-MIMO通信系统可以高效地恢复原始信号,同时窃听方无法截获信号。以2发1收天线为例,分别从合法方与窃听方误码率(BER)性能对比、接收性能与WFRFT阶数偏差关系进行仿真,当窃听方调制阶数误差均为0.1,信噪比为20dB时,其误码率为10-3,与合法方相差4dB。并通过对不同收发天线组的性能仿真,信噪比为10dB时,3发4收天线的性能较2发1收天线提高了4.5dB。
Aimed at the problems that the security is not high and the interception is easy,this paper proposes a new kind of satellite anti-interception communication system based on weighted-type fractional Fourier transform（WFRFT）and Multiple Input Multiple Output（MIMO）technology.The system is to modulate the signal by adopting multiple layer WFRFT.The number of WFRFT layers and the transmit antennas is the same.The modulation parameter of each WFRFT layer is different.The original signal subject to WFRFT modulation is characterized as time and frequency domain,can effectively resist the parameter scanning,and MIMO can effectively improve the spectrum utilization and system capacity.By theoretical analysis,the WFRFT-MIMO communication system can be used to restore the original signal efficiently,and the eavesdropper can＇t intercept the signal.Taking two-transmission and one-reception antennas as an example,the results of the contrast of bit error rate（BER）performance between legal receiver and eavesdropper and relationship between receiving performance and WFRFT order deviation are simulated respectively.When the modulation order error of the eavesdropper is 0.1,and the signal-to-noise ratio is 20 dB,the BER of eavesdropper is 10-3,which is more than the legal receiver 4 dB.The performancebetween different receiving performance and transmitting antennas groups is simulated,when the signal to noise ratio（SNR）is 10 dB,the performance of the three transmit four receive antennas is higher than that of the two transmit one receive antennas,which increases the 4.5 dB.
作者
翟东
达新宇
梁源
ZHAI Dong;DA Xinyu;LIANG Yuan(Information and Navigation College, Air Force Engineering University, Xi~an 710077, China)
出处
《空军工程大学学报（自然科学版）》
CSCD
北大核心
2018年第2期26-32,共7页
Journal of Air Force Engineering University(Natural Science Edition)
基金
国家自然科学基金(61571460)
关键词
卫星通信
加权类分数阶傅里叶变换
MIMO
抗截获性
satellite communication
weighted-type fractional Fourier transform
MIMO
anti-interception
