A superposition modulation based cooperative transmission scheme in regenerate-and-forward relaying networks

Since classical time-division-multiple-access based cooperative scheme suffers from lower data rate due to two time-slots based transmission approach, superposition modulation has recently gained huge research attention which enables single time-slot cooperative transmission. Therefore, in this paper we propose a novel superposition modulation based regenerate-and-forward cooperative transmission scheme with M-ary phase shift keying constellation signals. Closed-form expressions for average symbol error probability (SEP) and maximum power allocation for relay data are derived for proposed scheme. Simulation results show that proposed scheme outperforms classical cooperative scheme by providing higher spectral efficiency and lower SEP.