Video Information Exchange Based on Physical Layer Network Coding and Superposition Coding

Compared to conventional network coding, which must combine bit streams after they are decoded, the physical layer network coding (PNC) could make full use of electromagnetic (EM) waves arrived and combine bit stream at the physical layer. Because of this the system throughput could be improved. In this scheme we integrate PNC technique into wireless video transmission based on H.264 for relay channel. At the relay node the bit streams for exchanging are received and combined with different coefficients for the prioritized importance at each source node. Based on this process unequal error protection (UEP) could be realized. The proposed scheme could be outspreaded into the multi-user access model. Also a scheme of adaptively allocating the coefficient is proposed and as the simulation results depict the adaptive method could improve the quality of received image compared to conventional equal error protection (EEP) scheme. And compared to traditional video transmission the system throughput could be improved because of the use of PNC technique.