Near optimal power allocation in two-way relay systems with physical layer network coding

In this study, the authors examine the power allocation (PA) in a two-way relay system, where the relay adopts physical layer network coding based on decode-and-forward protocol. In the PA, the optimisation objective is to minimise the end-to-end symbol error probability (SEP) under a total power co...

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Bibliographic Details
Published in:IET communications Vol. 9; no. 15; pp. 1885 - 1893
Main Authors: Chen, Chen, Bai, Lin, Yang, Yehua, Jin, Ye, Choi, Jinho
Format: Journal Article
Language:English
Published: The Institution of Engineering and Technology 15.10.2015
Subjects:
Allocations
Asymptotic properties
asymptotic SEP expression
asymptotic SNR gains
closed‐form solution
Coding
decode and forward communication
decode‐and‐forward protocol
end‐to‐end symbol error probability minimization
error statistics
gain 1.76 dB
gain 2.22 dB
Mathematical models
minimisation
near optimal power allocation
network coding
Networks
Noise levels
NOPA scheme
numerical analysis
numerical methods
optimisation objective
Optimization
physical layer network coding
protocols
relay networks (telecommunication)
Relay systems
SEP
total power constraint
two‐way relay systems
network coding
numerical methods
NOPA scheme
two-way relay systems
end-to-end symbol error probability minimization
physical layer network coding
near optimal power allocation
closed-form solution
decode-and-forward protocol
decode and forward communication
PA
asymptotic SNR gains
optimisation objective
numerical analysis
total power constraint
protocols
minimisation
gain 2.22 dB
relay networks (telecommunication)
error statistics
SEP
asymptotic SEP expression
gain 1.76 dB
ISSN:1751-8628, 1751-8636
Online Access:Get full text
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Description
Summary:In this study, the authors examine the power allocation (PA) in a two-way relay system, where the relay adopts physical layer network coding based on decode-and-forward protocol. In the PA, the optimisation objective is to minimise the end-to-end symbol error probability (SEP) under a total power constraint. Since the optimal power allocation (OPA) scheme requires numerical methods (for exhaustive search) to find the solution, which might be infeasible for practical systems, the authors propose a near optimal power allocation (NOPA) scheme that has a closed-form solution by studying the properties of the OPA scheme. The asymptotic SEP expression of the proposed NOPA scheme is also derived. Simulation results show that the performance of proposed NOPA scheme is quite close to that of the OPA scheme. Furthermore, it is shown that the NOPA scheme can provide asymptotic SNR gains of 1.76 dB and 2.22 dB over two well-known schemes.
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content type line 23
ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2014.1249