Physical Network Coding for OFDM in Two- Way Receiving Communications

This paper is related with the purpose of distributed coding in the multiple access (MA) phase for two-way relaying communication (TWRC) systems using OFDM. The error probability analysis is organized to establish the diversity and coding Gains for three error categories in the MA phase. Then, the design decided of distributed coding to reaches the maximum diversity and coding gains are given. The frequency-grouped linear constellation precoding (F-GLCP) is first examined and shown not to be able to achieve the maximum diversity gain under type-3 errors. A novel frequency–time GLCP (FT-GLCP) that performs coding in both the frequency and time domains is then applied. It is proved that the proposed FT-GLCP is able to reaches the maximum diversity gain under type-3 errors while maintaining the maximum diversity and coding gains under type-1 and type-2 errors. To finding the theoretical analysis, simulation results are provided to show the advantage of the proposed FT-GLCP over other schemes in both Rayleigh and Rician fading channels.