A novel successive relaying protocol based on superposition coding

Successive relaying is a prominent way to efficiently reduce the multiplexing loss in cooperation system. In this paper, we design a successive relaying protocol based on superposition coding. After solving the co-channel interference at the relays, they have capacity of forwarding the superposition code of the relaying signal and the source signal. An analysis model is established in terms of system achievable rate. The BER performance of our approach is also compared with that of some cooperation protocols. It is shown that the proposed protocol can reduce the system BER and offer some diversity gain, while achieves almost the same multiplexing performance compared with direct communication.