- Volume 35 Issue 2
DOI QR Code
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
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.
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