Simplified Maximum Likelihood Detection with Unitary Precoding for XOR Physical Layer Network Coding

Satoshi DENNO

IEICE TRANSACTIONS on Communications   Vol.E100-B    No.1    pp.167-176
Publication Date: 2017/01/01
Publicized: 2016/07/19
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016EBP3064
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
physical layer network coding,  detection and forward relay,  forward error correction,  maximum likelihood detection,  complexity reduction,  

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This paper proposes novel simplified maximum likelihood detection for XOR physical layer network coding (XOR-PNC) in bi-directional wireless relay systems with Quaternary phase shift keying (QPSK). The proposed detection applies unitary precoding to achieve superior performance without computationally prohibitive exhaustive search. The performance of the XOR employing the proposed simplified MLD with the precoding is analyzed in relay systems with orthogonal frequency division multiplexing (OFDM). The performance of the XOR-PNC with the proposed techniques is also evaluated by computer simulation. The XOR-PNC with the proposed techniques achieves about 7dB better performance than the amplify-and-forward physical layer network coding in the 5-path fading channel at BER=10-4. It is also shown that the XOR-PNC with the proposed techniques achieves better performance than that without precoding.