A distributed multi-antenna space hopping transceiver technique: Part II 0/1 space hopping technique in backward training mode with weight-feedback

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.