A simple rate-1/2 co-decoding scheme for Writing on Dirty Paper

This paper proposes a simple co-decoding scheme for a Writing on Dirty Paper scenario, where the transmitted signal is affected by interference known by the transmitter and thermal noise. We focused on rate-1/2 codes, suitable for low SNR regions, but the scheme is easily generalizable to different code rates. In particular our approach involves a proper combination of an LDPCC and a vector quantizer based on a convolutional code and directly allows for iterative softinformation exchanges between the respective decoders. We show that it is possible to reach BER performance within 1.2-1.3 dB from the correspondent LDPCC´s in AWGN channels. Moreover, the obtained performance are completely unaffected by the amount of interference.