An improved scheme based on Physical-layer Network Coding

In the wireless communication system, interference is considered harmful. Wireless networks strive to avoid scheduling multiple transmissions at the same time in order to prevent interference. While Physical layer Network Coding (PNC) was proposed to embrace interference in order to improve throughput performance. During the second stage of PNC, the intermediate node broadcast the mapping signal to all of destinations, and PNC uses the TDM in order to avoid the interference from same frequency. As a result, when the user receives the mapping signal from the relay station, we could not send the second frame. In this paper, an improved scheme based on PNC is proposed in Two-way system. The paper adopts the Paired Communication Multiple Access (PCMA) idea to handle the mixed signal in the same slot, and implements the scheme that the sender could send the frames continuously. Extensive simulation studies show that the new Continuous PNC scheme is feasible and improves the communication throughput effectively by 60%.