Iterative decoding for superposition modulation-based cooperative transmission

We propose a new superposition modulation-based cooperative diversity scheme and investigate receivers with iterative detection and decoding for the scheme, where we focus on a interference cancellation (IC) detector. We analyze the bit-error-probability (BEP) of the scheme and find the optimal power allocation. Simulation results are shown to be very close to the analytical results for a wide range of signal-to-noise ratios (SNRs). It is also demonstrated that the proposed scheme is about 2-3.5 dB better than the system previously proposed in the literature.