Adaptive Amplify and Forward User Cooperation Scheme of LDPC Coding

Because the amplifier gain of relay node is fixed,the efficiency of power is not high for the amplify and forward scheme in user cooperation.An algorithm which can adaptively adjust the gain is presented in this paper.The adaptive scheme improves the utilization ratio of energy in the presence of the reliability requirement.Theoretical analysis and simulation results demonstrate that the adaptive algorithm takes advantage of power more efficiently than the traditional fixed scheme with the given error rate.