发射聚焦式的多天线跳空安全通信技术
5A Multi？？Antenna Space Hopping Secure Communication Technique with Transmission Focusing

为了提高无线通信的安全保密性,针对前向训练模式下的0/1式跳空技术训练机制和跳空图案泄露后存在的泄密问题,以及权值反馈型的0/1式跳空技术信息反馈造成的实时性和可靠性不高的问题,提出了一种发射聚焦式的跳空收发技术。该技术由合法接收用户发射训练信号,发射端通过相关检测和处理,加载信息后使信号原路返回并在合法接收用户的发射天线处同相叠加,从而使能量聚焦于合法接收用户处,合法接收用户无需信息交换过程即可正确接收信息,而窃听者则因快速切换天线形成的空间信道迅速变化难以解调信号。仿真结果表明,在-15 dB的低信噪比下,合法接收用户的误符号率低于10-2,而窃听者的误符号率随着信噪比的变化始终很高,维持在0.75左右,说明该技术既保证了合法接收用户的通信质量,又使窃听者无法正确接收和截获信息。
Since there exists security problem in the 0/1 space hopping technique in forward training mode when both the training scheme and the space hopping pattern are leaked, and the feedback process in the 0/1 space hopping technique with weight feedback results in low real？？time performance and low reliability, a space hopping transceiver technique with transmission focusing is proposed to improve the security of wireless communication. The legitimate user firstly transmits training signals. Then the transmitter sends a mixture of information signals and correlation detection results of the received signals and makes the signals return along the original path, and in？？phase stacking is accomplished in the transmitting antenna of the legitimate user so that energy is focused on the legitimate user. Thus the legitimate user can correctly demodulate the signal without any information exchange process. Furthermore, since the transmitter quickly switches antennas to make channels change rapidly, the eavesdropper can hardly demodulate the signal. Simulation results show that the symbol error rate of the legitimate user is lower than 10-2 at the low signal to noise ratio of -15 dB , while the symbol error rate of the eavesdropper always maintains a high level of about 0.75, even when the signal to noise ratio varies. The results illustrate that the proposed technique guarantees the communication quality of legitimate user while eavesdroppers are unable to intercept