Round Robin, Centralized and Distributed Relay Selection for Cooperative Systems Using Blind and Non-Blind Relays.

In this paper, we evaluate the theoretical bit error probability (BEP) of round robin, centralized and distributed relay selection for cooperative systems. Centralized relay selection activates the relay with the largest end-to-end signal-to-noise ratio (SNR) using a central node that will collect and compare these SNRs. In distributed relay selection, each relay compares its SNR to a predefined threshold T and is activated only when its SNR is larger than T. The threshold T is numerically optimized to have the lowest BEP. The network contains three nodes: one node acting as a source and the other two as destination. One of the destinations is selected to relay the signal to other destination node. Round robin relay selection consists to alternatively assign a node as relay. We also study relay selection for cognitive radio networks. The relay node should generate interference to primary receiver lower than a predefined threshold β. [ABSTRACT FROM AUTHOR]