分布式多天线跳空收发技术(Ⅱ)——权值反馈型反向训练模式下的0/1式跳空技术

A Distributed Multi-Antenna Space Hopping Transceiver Technique:PartⅡ 0/1 Space Hopping Technique in Backward Training Mode with Weight-Feedback

针对正向训练模式下的0/1式跳空技术在跳空图案泄露后存在的安全隐患,提出了权值反馈型反向训练模式下的0/1式跳空技术。该技术在发射方和目标用户均使用多天线,双方采用反向训练技术,使目标用户获得与正向训练模式下一致的权值,而侦听方即使窃取了跳空图案,但由于无线信道的差异性,仍然无法正确解调,这一点完全不同于传统跳频扩频方案。反向训练技术以从根源上解决无线通信安全问题为出发点,充分利用无线信号丰富的时空谱资源,保证了物理层安全传输。仿真结果表明,在跳空图案和反馈权值都泄露的情况下,侦听方的误符号率始终极高,根本无法侦听信息。

Since the 0/1 space hopping technique in forward training mode has security problems after the leak of space hopping pattern,a backward training technique with weight-feedback is proposed.Through backward training between the transmitter and the target user,the target user can obtain the weights that are equivalent with those generated from the forward training,while the eavesdropper,even if she steals the space hopping pattern,cannot correctly demodulate because of the diversity of the wireless channel.It is this technique that is completely different from the traditional frequency hopping spread spectrum technique.The proposed technique aims at solving the secure problem of wireless communications fundamentally,makes full use of the abundant space-time spectrum resources of the wireless signals,and ensures secure transmission in physical layer.Simulation results show that even when both the space hopping pattern and the feedback weights are leaked,the eavesdropper keeps a high symbol error rate and cannot intercept information.