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
ISWCS 2010 Wuebben
ISWCS 2010 Wuebben.pdf192 KB
Last change on 24.09.2010 by D. Wübben
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