Network-coded SIR-based relay selection for multiple-relay TWRC

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• 作者：Slim Chaoui
• 关键词：Network coding ; Decode and forward ; Error ; propagation ; Soft information relaying ; Relay selection
• 刊名：Telecommunication Systems
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：63
• 期：4
• 页码：579-591
• 全文大小：769 KB
• 刊物类别：Business and Economics
• 刊物主题：Economics
  Business Information Systems
  Computer Communication Networks
  Artificial Intelligence and Robotics
  Probability Theory and Stochastic Processes
  
• 出版者：Springer Netherlands
• ISSN：1572-9451
• 卷排序：63

文摘

This paper considers a two-way relay channel (TWRC) that operates in a multiple-relay context with network-coded soft information relaying. During the relaying process, the log likelihood ratio sequence resulting from the network coding of the two soft-in soft-out decoders output sequences is supplied to a soft encoder. In order to mitigate the error-propagation due to the erroneous decoding at the relay, a method is proposed for modelling the soft estimated symbols at the output of the soft encoder which is mathematically convenient to work with. The signal-to-noise ratios of the equivalent one-hop channels towards each end-node are derived. Accordingly, the study proposes two relay selection (RS) schemes based on the network-coded soft information relaying, a sub-optimal Max–Min-based single RS scheme, and a double-side RS scheme. Closed-form expressions for the bit error rate performances and asymptotic pairwise error probabilities of the multiple-relay TWRC with the proposed RS schemes are derived. Monte-Carlo simulations are carried out to verify the accuracy of the analytical results.