Fuzzy logic based relay search algorithm for cooperative systems

Cooperative systems provide spatial diversity in wireless communications that is advantages when multiple antennas at wireless nodes are not cost effective. In this work, we propose fuzzy logic based relay search algorithm for 2-hop cooperative systems with the goal of maximizing the performance of a system in terms of SER (Symbol error rate). The algorithm requires effective SNR (signal to noise ratio), and total time delay of the link (propagation delay and processing delay at relay) as fuzzy parameters. The performance of the proposed algorithm is compared with Blind-Selected Algorithm and Informed-Selected Algorithm. Simulation results shows that Fuzzy logic based relay search results in substantial improvement over the existing relay selection algorithms.