Robust precoder-decoder design for physical layer network coding-based MIMO two-way relaying system

In this paper, we investigate a robust joint precoder-decoder design scheme for a multiple-input multiple-output physical layer network coding (PNC)-based two-way relay system. An orthogonal training sequence is used to estimate the channels. The estimate is imperfect, and a robust design is propose...

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Vydané v:EURASIP journal on wireless communications and networking Ročník 2013; číslo 1
Hlavní autori: Saliya Jayasinghe, Laddu Keeth, Rajatheva, Nandana, Latva-Aho, Matti
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Cham Springer International Publishing 26.05.2013
Predmet:
Communications Engineering
Engineering
Information Systems Applications (incl.Internet)
Networks
Signal,Image and Speech Processing
Non-convex optimization
Physical layer network coding
Bit error rate
Imperfect channel state information
Multiple-input multiple-output
Mean square error
ISSN:1687-1499, 1687-1499
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Shrnutí:In this paper, we investigate a robust joint precoder-decoder design scheme for a multiple-input multiple-output physical layer network coding (PNC)-based two-way relay system. An orthogonal training sequence is used to estimate the channels. The estimate is imperfect, and a robust design is proposed to find precoders at the source nodes and decoder at the relay node to facilitate PNC operations during multiple-access stage. Both channel estimation error and antenna correlations are used to formulate the optimization problem to minimize the weighted mean square error (WMSE) under a total power constraint. The problem becomes non-convex, and we propose an algorithm to solve it optimally. During the broadcast stage, an algorithm is proposed to find a precoder at the relay node and decoders at source nodes. The system performance is evaluated with estimation error and antenna correlation parameters. The effect of weighting parameters, relay location, and number of antennas at nodes are also considered in the numerical analysis. Numerical results confirm that our joint precoder-decoder algorithms provide the optimal solution to the minimization of WMSE with the total available power.
ISSN:1687-1499
1687-1499
DOI:10.1186/1687-1499-2013-137