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To achieve secure wireless communications, since traditional solutions like frequency hopping spread spectrum (FHSS) technology not only are technically difficult to implement but also make the frequency resources shortage even more critical, researches on signal's energy distribution over space are conducted in this paper. The results indicate that space spectrum varies from location to location...
Since 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 transmitter and target user, the target user can obtain weights that are equivalent with those generated from forward training, while eavesdropper, even if she steals the space hopping...
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