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Volume 41 Issue 9
Sep.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(9): 1589-1594.
WU Zhanji, GAO Xiang. Simple and efficient novel multi-way relay network coding scheme[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(9): 1589-1594. doi: 10.13700/j.bh.1001-5965.2014.0632(in Chinese)
Citation: WU Zhanji, GAO Xiang. Simple and efficient novel multi-way relay network coding scheme[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(9): 1589-1594. doi: 10.13700/j.bh.1001-5965.2014.0632(in Chinese)
shu

Simple and efficient novel multi-way relay network coding scheme

doi: 10.13700/j.bh.1001-5965.2014.0632

  • School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

  • Received Date: 15 Oct 2014
  • Publish Date: 20 Sep 2015
    Abstract
  • A simple and efficient novel network coding scheme was proposed to improve the throughput and transmission reliability of multi-user multi-way relay network with full-data exchange. It was based on a multi-stage two-way network coding scheme. Two paired users transmitted their information symbols to the relay node simultaneously. Then, the relay node judged whether these two symbols have the same sign by hard decision for the received superimposed signal and broadcasted the decision result to all the users. If the two symbols had the same sign, the transmitted symbols could be known. Otherwise, anyone of the two users was selected to perform the network coding in the next round. Each pair of users performed in this manner sequentially until the transmitted symbols of all the users are obtained by each other. Both theoretical analysis and simulation results indicate that compared to the plain routing scheme and the binary-signaling network coding reference scheme, the throughput per source per channel use is increased remarkably. Besides, due to the simple nature of 3-plus amplitude modulation (3-PAM), the proposed scheme has much lower complexity and much higher reliability compared to the referenced scheme for large-scale multi-way relay channels. On the additive white Gaussian noise (AWGN)channel, low density parity check (LDPC) codes are utilized in this scheme to improve the reliability. The simulation results show that the signal-to-noise ratio (SNR) gains to reference scheme increase as the number of users increases, and the SNR gains of the LDPC-coding scheme are even bigger than the uncoding scheme.

     

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