XOR Physical Layer Network Coding with Non-Linear Precoding for Quadrature Amplitude Modulations in Bi-Directional MIMO Relay Systems

Satoshi DENNO  Yuto NAGAI  Yafei HOU  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.10   pp.2073-2081
Publication Date: 2019/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3346
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
network coding,  power loading,  non-linear precoding,  

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This paper proposes an XOR physical layer network coding (XOR-PLNC) with non-linear precoding for quadrature amplitude modulations (QAMs) in bi-directional MIMO relay systems. The proposed XOR-PLNC applies power loading in order to improve the transmission performance. The proposed XOR-PLNC introduces a modulus adapted to channel gains. Moreover, the modulus is further reduced in cooperation with modulo operation which the non-linear precoding employs for improvement of transmission power efficiency. The use of the reduced modulus improves the energy efficiency of the signal transmission, which improves the transmission performance in the proposed XOR-PLNC. The performance is evaluated by computer simulations in bi-directional MIMO relay channels with 16QAM to 1024QAM.