Open AccessSER‐Based Relay Selection for Two‐Way Relaying with Physical Layer Network Coding
Author(s) -
Li Dandan,
Xiong Ke,
Qiu Zhengding,
Du Guanyao
Publication year - 2013
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.13.0212.0211
Subject(s) - relay , linear network coding , keying , phase shift keying , relay channel , computer science , coding (social sciences) , binary number , selection (genetic algorithm) , constellation , expression (computer science) , algorithm , topology (electrical circuits) , electronic engineering , bit error rate , mathematics , telecommunications , decoding methods , computer network , arithmetic , engineering , statistics , physics , artificial intelligence , power (physics) , quantum mechanics , network packet , programming language , combinatorics , astronomy
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.