Relay Pre-Selection for Reducing CSI Transmission in Wireless Sensor Networks
Javad Haghighat, Mohsen Eslami, Walaa Hamouda · IEEE Communications Letters · 2016
Relay selection requires collection and transmission of channel state information (CSI) to a central node. When all relay nodes contribute in CSI transmission, the amount of power required for signaling the CSIs linearly increases with the number of relays. A central node should determine the proper number of pre-selected relays by aid of channel statistics and a decision criterion. We derive an upper bound on this number when end-to-end bit error rate is considered as the decision criterion and the source-relay channels are time-varying fading channels.