关键词: 广义空移键控, 物理层安全, 相位对齐, 保密传输

Abstract:

A physical layer security transmission scheme based on generalized space shift keying modulation for multiple-input single-output system was proposed. The transmitter uses the channel state information feedbacked by the legitimate user to preprocess the transmit signals. So the signals received by the legitimate user from each transmit antenna have the same phase. Furthermore, the transmitter takes a phase rotation to increase the distances among the constellation points, thereby improving the receive performance of the legitimate user and will reduce the error rate. However, the phase of each signal received by the eavesdropper is randomly distributed, so the performance of eavesdropper is significantly inferior to the legitimate user. Analysis and simulation are done for bit error rate of the legitimate user and the eavesdropper. The behavior of secrecy capacity of the system is good. It is shown that the proposed scheme can significantly reduce the legitimate user's bit error rate, even the channel performance of the legitimate user is worse than the eavesdropper, and the secure transmission can be realized.

Key words: generalized space shift keying, physical layer security, phase alignment, secure transmission