Ghasem Saeidi - Department of Communication Engineering, Shahre-e-Rey Azad University Tehran, Iran

One of the modern and most operational techniques to overcome disappearing in wireless environment is cooperative communication. As most mobile units are provided for limited power, control, the improvement of the power distribution for cooperative networks is of high significance. Power allocation approaches in these types of systems can be applied for saving conveying power and improving the lifetime. In this paper, the approaches for limited power distribution whose quantities are specified by the restraint in single-relay amplify and forward cooperative network are planned to diminish the symbol error rate applying Lagrange approach and fuzzy logic. Linguistic value of membership purposes of fuzzy approach applying Particle Swarm Optimization algorithm is attained. The results of simulation revealed that the symbol error rate presentation of both approaches is indistinguishable. As the computational intricacy of the power allocation with Lagrange scheme particularly in multi-relay nets is high, hypothetical examination and the closed-form have not been found yet so fuzzy, logic is a suitable technique for power distribution in multi-relay amplify and forward cooperative networks.

Cooperative Network, Power Allocation, Symbol Error Rate, Amplify and Forward relay, Fuzzy Logic