Design and Analysis of Multi-Level Physical-Layer Network Coding for Gaussian Two-Way Relay Channels

In this paper, we propose a multi-level physical-layer network coding (MPLNC) scheme that optimizes the relay performance for both symmetric and asymmetric traffic in a Gaussian two-way relay channel. The proposed MPLNC scheme enables each source to employ multiple linear binary codes for encoding,...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 62; no. 6; pp. 1803 - 1817
Main Authors: Chen, Zhiyong, Xia, Bin, Hu, Zixia, Liu, Hui
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.06.2014
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Applied sciences
Binary codes
Channels
Codes
Coding
Coding, codes
Constellation diagram
Decoding
Design engineering
Encoding
Error analysis
Errors
Exact sciences and technology
Information, signal and communications theory
Modulation
Modulation, demodulation
Network coding
Networks
Relay
Relays
Signal and communications theory
Switching and signalling
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
physical-layer network coding
symmetric and asymmetric relaying
multilevel coding
error exponent
Two-way relay channels
Performance evaluation
Relaying
Relay
Error probability
Labelling
Binary code
Linear code
Modulation
Multilevel system
Packet switching
Multistage method
Two channel system
Decoding
Binary coding
Upper bound
Relay channel
Simulation
Network coding
Interleaved codes
Multilayer network
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:In this paper, we propose a multi-level physical-layer network coding (MPLNC) scheme that optimizes the relay performance for both symmetric and asymmetric traffic in a Gaussian two-way relay channel. The proposed MPLNC scheme enables each source to employ multiple linear binary codes for encoding, one per modulation level, and the relay node to decode superimposed network codewords at each modulation level. We first derive the achievable rate for the transmission of arbitrary constellations and then prove that MPLNC with multistage decoding (MPLNC/MSD) can achieve the achievable rate if binary code rates are properly chosen for both sources. Furthermore, the design criteria for the proposed MPLNC scheme is investigated, which includes the rate design rule and the labeling strategy. Moreover, we derive the error exponent and an upper bound of the overall error probability for MPLNC. Our analysis and simulation results show that MPLNC/MSD has a significant performance advantage in comparison to the existing bit-interleaved coded modulation (BICM)-based PLNC scheme.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2014.2318052