Abstract
In wireless sensor networks, multi-way relaying is a very common network configuration, where multiple nodes exchange information via a single relay over uncorrelated fading channels. In such configuration, node pair-wise communication together with physical-layer network coding (PNC) at the relay node provides a good trade-off between spectral efficiency and error performance. A joint channel decoding-PNC algorithm employed at the relay can further improve the bit error rate performance. This study proposes an improved joint channel decoding-PNC algorithm for M-ary phase shift keying modulated multi-way wireless relay systems. The proposed algorithm can achieve an additional diversity gain by exchanging bit-level or symbol-level soft information between the constitute decoders decoding different information pairs. Moreover, several schemes are proposed for exchange of the soft information between the parallely operating channel decoders. Simulation results demonstrate improved error and convergence performance of the proposed algorithm over the existing algorithms at the expense of non-significant increase in computational complexity.
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