Joint Channel Decoding and Physical-Layer Network Coding in Two-Way QPSK Relay Systems by a Generalized Sum-Product Algorithm

Author:	D. Wübben
Abstract:	A physical-layer network coded two-way relay system applying Low-Density Parity-Check (LDPC) codes for error correction is considered in this paper, where two sources A and B desire to exchange information with each other by the help of a relay R. The critical process in such a system is the calculation of the network-coded transmit word at the relay on basis of the superimposed channel-coded QPSK words of the two sources. For this joint channel-decoding and network-encoding task a generalized Sum-Product Algorithm (SPA) over GF(16) is developed. This novel iterative decoding approach outperforms other recently proposed schemes as demonstrated by simulations.
Document type:	Conference Paper
Publication:	York, Great Britain, 19. - 22. September 2010
Conference:	7th International Symposium on Wireless Communication Systems (ISWCS 10)
Pages:	576-580
Files:	ISWCS 2010 Wuebben 192 KB BibTEX