@inproceedings{ author = {D. W\"{u}bben}, year = {2010}, month = {Sep}, title = {Joint Channel Decoding and Physical-Layer Network Coding in Two-Way QPSK Relay Systems by a Generalized Sum-Product Algorithm}, pages = {576-580}, URL = {http://www.iswcs.org/iswcs2010/}, address={York, Great Britain}, 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.}, booktitle={7th International Symposium on Wireless Communication Systems (ISWCS 10)} }