Channel coding and decoding in a relay system operated with physical-layer network coding
By Shengli Zhang, Soung Chang Liew. IEEE Journal on Selected Areas in Communications, 2008
331 citations recorded by the source corpus.
This paper investigates link-by-link channel-coded PNC (physical layer network coding), in which a critical process at the relay is to transform the superimposed channel-coded packets received from the two end nodes (plus noise), Y<sub>3</sub> = X<sub>1</sub>+ X<sub>2</sub>+W<sub>3</sub>, to the network-coded combination of the source packets, S<sub>1</sub> oplus S<sub>2</sub>. This is in contrast to the traditional multiple-access problem, in which the goal is to obtain both S<sub>1</sub> and S<sub>2</sub> explicitly at the relay node. Trying to obtain S<sub>1</sub> and S<sub>2</sub> explicitly is an overkill if we are only interested in S1oplusS<sub>2</sub>. In this paper, we refer to the transformation Y<sub>3</sub> rarr S<sub>1</sub> oplus S<sub>2</sub> as the channel-decoding- network-coding process (CNC) in that it involves both channel decoding and network coding operations. This paper shows that if we adopt the repeat accumulate (RA) channel code at the two end nodes, then there is a compatible decoder at the relay that can perform the transformation Y<sub>3</sub> rarr S<sub>1</sub>oplusS<sub>2</sub> efficiently. Specifically, we redesign the belief propagation decoding algorithm of the RA code for traditional point-to-point channel to suit the need of the PNC multiple-access channel. Simulation results show that our new scheme outperforms the previously proposed schemes significantly in terms of BER without added complexity.
Subfields: Computer Networks and Communications, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/b96c285381c91d4ee11baed8bf1f566663b9b50e
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Computer Networks and Communications
In Electrical and Electronic Engineering
Citations in the corpus
- Physical-layer network coding: Tutorial, survey, and beyond (2011, methodology): “It can be shown than Joint CNC and the arithmetic-sum CNC in [30] have the same performance.”