Joint channel decoding and physical-layer network coding in two-way QPSK relay systems by a generalized Sum-Product Algorithm

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 calcula...

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Veröffentlicht in:2010 7th International Symposium on Wireless Communication Systems S. 576 - 580
1. Verfasser: Wubben, Dirk
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: IEEE 01.09.2010
Schlagworte:
Decoding
Fading
Joints
Network coding
Parity check codes
Phase shift keying
Relays
ISBN:9781424463152, 1424463157
ISSN:2154-0217
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Zusammenfassung: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 F 16 is developed. This novel iterative decoding approach outperforms other recently proposed schemes as demonstrated by simulations.
ISBN:9781424463152
1424463157
ISSN:2154-0217
DOI:10.1109/ISWCS.2010.5624358