Joint Channel Network Coding for correlated sources

In this paper, we consider a Generalized Joint Channel Network Coding (GJCNC) applied to Physical Layer Network Coding (PLNC) for Two Way Relay Channel (TWRC). For this purpose, two correlated sources A and B desire to exchange information with each other by the help of a relay R. PLNC allows the relay to decode the combined information of both sources from the superimposed information. A Low Density Parity Check (LDPC) code is used as a channel code. A new design of GJCNC is developed by exploiting the correlation between nodes. Since the relay doesn´t know in advance the correlation between sources, an estimation of this quantity must be applied. Simulation results show that the Bit Error Rate (BER) can be significantly decreased by exploiting this correlation. In addition, a lower number of iterations is necessary to achieve a desired BER in comparison with a classical scheme which doesn´t exploit the correlation between sources.