Abstract:

In order to approach the theoretical limit of decode and forward strategy for halfduplex multiple access relay  channel, a parity jointly coded multi-edge type LDPC(PJCMET-LDPC) coding structure and its corresponding optimization  scheme are proposed. The new structure makes the extra parity bits generated by the relay as a part of the overall code.  Using messages from all source nodes and the relay node, the destination can decode the information of all sources. To  analyze the performance of PJCMET-LDPC codes, a multilateral extrinsic information transfer (EXIT) chart based on  messageerror rate is devised as an extension of standard EXIT. Based on this EXIT chart, a design methodology is  developed for PJCMET-LDPC codes. Experment results show that PJCMET-LDPC codes always outperform both SCCLDPC codes  and NCC-LDPC codes.