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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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SER-Based Relay Selection for Two-Way Relaying with Physical Layer Network Coding

  • Li, Dandan (School of Computer and Information Technology, Beijing Jiaotong University) ;
  • Xiong, Ke (Department of Electrical Engineering, Tsinghua University, School of Computer and Information Technology, Beijing Jiaotong University) ;
  • Qiu, Zhengding (School of Computer and Information Technology, Beijing Jiaotong University) ;
  • Du, Guanyao (School of Computer and Information Technology, Beijing Jiaotong University)
  • Received : 2012.05.31
  • Accepted : 2012.10.01
  • Published : 2013.04.01
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Abstract

To enhance the symbol error rate (SER) performance of the two-way relay channels with physical layer network coding, this letter proposes a relay selection scheme, in which the relay with the maximal minimum distance between different points in its constellation among all relays is selected to assist two-way transmissions. We give the closed-form expression of minimum distance for binary phase-shift keying and quadrature phase-shift keying. Additionally, we design a low-complexity method for higher-order modulations based on look-up tables. Simulation results show that the proposed scheme improves the SER performance for two-way relay networks.

Keywords

References

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