0/1 Space Hopping Technique in Backward Training Mode with Pre-Compensation

• 1、School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an 710049

Abstract：0/1 space hopping technique with forward training method may lead to interception when the space hopping pattern and the training method are both given away to an eavesdropper. The backward training method with weight-feedback, which can solve the above security problem, however, suffers from low efficiency in the feedback step. In this paper, backward training method with pre-compensation is proposed. In the new method, training signal is transmitted by the authorized receiver. Channel knowledge is acquired at the transmitter through training and used in pre-compensation. Thus the receiver can correctly receive information without any feedback, and then, through further adjustment, achieve the same performance as the forward training method and the backward training method with weight-feedback, while the eavesdropper always cannot intercept the information. The security of 0/1 space hopping technique in backward training mode, as well as the influence of noise on the proposed method and the corresponding countermeasure, is also discussed in this paper. Simulation results are presented to show the validity of the proposed backward training method.

Keywords： wireless communication space hopping multi-antenna space spectrum security