On the Performance of Superposition Cooperative Diversity in Wireless Networks

An efficient cooperative transmission scheme has been recently proposed based on superposition modulation. Analytical results are necessary to fully understand the superiority of this new scheme, which is the main contribution of this paper. Tight upper and lower bounds of the outage probability of this scheme are first proposed and then the large SNR behavior of the outage probability is studied. Our analytical results prove that the superposition cooperative transmission scheme can achieve around 3 dB better performance and larger diversity order than the selection relaying scenario, which are consistent with the simulation results reported earlier. Finally, we provide outage, delay-limited and ergodic capacity results of cooperative techniques