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)}