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Space hopping is a transmission scheme that emits wireless signals by rapidly switching transmit antennas according to the space hopping pattern. This paper proposes a transmission focusing based space hopping technique which aims at improving communication security by exploiting spatial resources sufficiently. More specifically, the legitimate user first transmits a training signal. Then the transmitter...
Opportunistic relay selection is considered as an efficient approach to implement cooperative communication in multi-relay cooperative networks owing to its low implementation complexity. However, due to channel fluctuations, the channel state information (CSI) employed in relay selection process may differ from the exact CSI in data forwarding, in other words, the CSI is outdated. Addressing this...
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