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At present, wireless physical layer security is a hot topic. The present a Random Beamforming Security (RBS) method in this paper, with which the system secrecy capacity can be positive, even when the quality of main channel is worse than that of wiretap channel. The RBS method utilizes the difference between the channel characteristic vectors of main channel and wiretap channel to transmit signal in the direction of main channel characteristic vector, and construct a random artificial channel for eavesdropper in the mean time.
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