Channel Decoding and Nonbinary Physical-Layer Network Coding in Two-Way Relay Systems
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AbstractIn this paper, we propose a generalized channel decoding scheme for nonbinary physical-layer network coding (CD-NC) in two-way relay channels (TWRCs), where two source nodes A and B exchange their nonbinary symbols via a relay. The two sources use the same nonbinary low-density parity-check (LDPC) channel code over the integer ring Z(M) and M-pulse-amplitude modulation, respectively. The existing channel decoding schemes for nonbinary network coding suffer severe rate loss compared with the cut-set bound of TWRC, especially in the low-to-medium signal-to-noise ratio regime. The proposed CD-NC can decrease the rate loss. Our contributions are as follows: 1) We develop a generalized nonbinary sum product algorithm (G-SPA) for CD-NC according to the principle of virtual encoding of the superimposed symbols. Simulation results show that our CD-NC can achieve significant performance gains over the conventional non-binary network coding for both additive white Gaussian noise and fading channels; and 2) We exploit two-dimensional fast-Fourier-transform-based belief propagation (2-D-FFT-BP) and extended min-sum (EMS) decoding algorithms to reduce the decoding complexity of G-SPA. Simulation results show that the 2-D-FFT-BP has the same performance asG-SPA, while EMS can greatly reduce the decoding complexity of G-SPA at the cost of slight performance degradation.
All Author(s) ListP. Chen, L. Shi, S. C. Liew, Y. Fang, K. Cai
Journal nameIEEE Transactions on Vehicular Technology
Volume Number68
Issue Number1
Pages628 - 640
LanguagesEnglish-United States
KeywordsPhysical-layer network coding, two-way relay channel (TWRC), nonbinary LDPC, channel decoding

Last updated on 2020-26-01 at 03:10