Abstract:

A high-order diversity scheme is proposed for relay cooperation by using network-channel coding approach. The information received by the relay node in different time is coded with a channel coding method. Then all the codes are forwarded after network coding. Using iterative and maximum a posteriori decoding method, the information can be obtained at the destination node by decoding the codes received in different time. The pairwise error probability analysis under Rayleigh fading channel shows that the proposed scheme can increase time diversity gain by forwarding the information several times at source node in different time slots. Simulation results show that the scheme can obtain higher diversity gain in both fast and slow fading channels. Furthermore, the performance can be improved as the received signal to noise ratio of the relay node increases.

Key words: communication, channel coding, network coding, maximum a posteriori decoding, Rayleigh fading, signal to noise ratio