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 e
nergy 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.
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references
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