Selective adaptive cooperative design with outdated feedback

Abstract

In this paper, a Selective Adaptive Cooperative scheme based on the adaptive cooperative system is proposed to improve the system performance, which is scheduled through combining multilevel adaptive modulation (AM) at the physical layer with truncated automatic repeat request (ARQ) protocol at the data link layer. This paper derives the closedform expressions of the spectral efficiency and outage probability for the Selective adaptive cooperative scheme. It shows by simulation that the proposed system has better performance than the original adaptive cooperative system. Under outdated feedback, we also analyze the impact of the retransmission number, delay-time and the number of cooperative users on the performance of the proposed system.