In wireless communications

efficient power allocation has the advantage of reducing resource consumption

achieving better quality-of-service (QoS)

and reducing network interference.This paper is focus on the power allocation problem in wireless parallel amplify-and-forward relay transmissions.Particularly

the objective is set to minimize the transmit power of the communication nodes while guaranteeing the signal-to-noise ratio (SNR) requirement at the destination node.Firstly

based on the established channel model of wireless relay cooperative communication system

the expression of SNR is derived.Following that

the power allocation problem is modeled as a combinatorial optimization problem.Moreover

using convex optimization theory

this paper proposes a suboptimal power allocation algorithm with low complexity.The simulation results show that the method proposed in this paper is capable of resolving the power allocation problem in wireless relay communication systems with low computational complexity as well as stable performance.