Satellite Anti-interception Communication System Based on WFRFT and MIMO

Abstract

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 to improve the safety and anti-interception of satellite communication system. This system adopts multiple-layer WFRFT to modulate the signal. The number of WFRFT layers and the transmit antennas is the same. The modulation parameter of each WFRFT layer is different. After WFRFT modulation, the original signal has the characteristic of time and frequency domain, which can effectively resist the parameter scanning. 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 transmit and one receive antennas for 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 20dB, the BER of eavesdropper is $10^{-3}$, which is more than the legal receiver 4dB. The performance between different receiving performance and transmitting antennas groups is simulated, when the signal to noise ratio (SNR) is 10dB, the performance of the three transmit four receive antennas is higher than that of the two transmit one receive antennas, which increases the 4. 5dB.