Opportunistic Multiple Relay Selection with Diverse Mean Channel Gains
Chia-Hao Yu, Olav Tirkkonen · IEEE Transactions on Wireless Communications · 2012
We consider multiple relay selection for proactive relaying with diverse mean channel gains on different links. We consider a variable rate system where the transmission rate is maximized based on an end-to-end (e2e) channel gain. We consider two relay selection methods and provide an efficient algorithm for selecting an optimal set of active relay nodes, with a cardinality constraint on the set. An approximation to the statistical behavior of the e2e performance for the two relay selection methods is derived. Our results show benefits from using multiple relays when different links exhibit different mean channel gains.