Power Allocation for Multi-Relay AF Cooperative System with Maximum System Capacity

In order to maximize the capacity of the cooperative communication system, a power allocation scheme for multi-relay AF cooperative system based on blind relays is presented in this paper. Under the premise that the source power is known, the power allocation problem is modeled to maximize the capacity of the system and transformed into the standard convex optimization. The power allocation factors of each relay is obtained by solving the Karush-Kuhn-Tucher (KKT) condition. Finally, the capacity and outage probability of the proposed scheme are provided for the proposed power allocation scheme. Compared with the typical equal power allocation, the proposed convex optimization-based power allocation scheme achieves better performance.