Mitigating error propagation in two-way relay channels with network coding

Sinh Le Hong Nguyen, Ali Ghrayeb, Ghaleb Al-Habian, Mazen Hasna

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

In relay networks, error propagation at the relay nodes degrades the performance of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. Specifically, the relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These values are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We investigate the application of this technique to a network-coded two-way relay channel where the relay is assisting two sources simultaneously. We first consider network-coded systems without channel coding, and then consider network-channel coded systems. We examine two modes of thresholding, one based on the individual bits, and the other based on the combined bits. We provide the full analysis for the bit-error rate (BER) performance of both thresholding modes and optimize the thresholds accordingly. We demonstrate that the optimum thresholds based on both modes give similar performances and are far better than the case of no thresholding. We also consider the performance of the proposed thresholding techniques for network-channel coded systems. We present several numerical examples that illustrate the efficacy of employing thresholding at the relay nodes (for networks with and without channel coding).

Original languageEnglish
Article number5581212
Pages (from-to)3380-3390
Number of pages11
JournalIEEE Transactions on Wireless Communications
Volume9
Issue number11
DOIs
Publication statusPublished - Nov 2010
Externally publishedYes

Fingerprint

Relay Channel
Error Propagation
Network coding
Network Coding
Thresholding
Relay
Channel Coding
Channel coding
Log-likelihood Ratio
Relay Networks
Vertex of a graph
Bit error rate
Error Rate
Efficacy
Optimise
Calculate
Numerical Examples
Demonstrate

Keywords

  • Cooperative communications
  • error propagation
  • network coding
  • relay networks
  • threshold-based relaying

ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Mitigating error propagation in two-way relay channels with network coding. / Nguyen, Sinh Le Hong; Ghrayeb, Ali; Al-Habian, Ghaleb; Hasna, Mazen.

In: IEEE Transactions on Wireless Communications, Vol. 9, No. 11, 5581212, 11.2010, p. 3380-3390.

Research output: Contribution to journalArticle

Nguyen, Sinh Le Hong ; Ghrayeb, Ali ; Al-Habian, Ghaleb ; Hasna, Mazen. / Mitigating error propagation in two-way relay channels with network coding. In: IEEE Transactions on Wireless Communications. 2010 ; Vol. 9, No. 11. pp. 3380-3390.
@article{510ec79c642d46a2ad08e6e44cd9e230,
title = "Mitigating error propagation in two-way relay channels with network coding",
abstract = "In relay networks, error propagation at the relay nodes degrades the performance of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. Specifically, the relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These values are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We investigate the application of this technique to a network-coded two-way relay channel where the relay is assisting two sources simultaneously. We first consider network-coded systems without channel coding, and then consider network-channel coded systems. We examine two modes of thresholding, one based on the individual bits, and the other based on the combined bits. We provide the full analysis for the bit-error rate (BER) performance of both thresholding modes and optimize the thresholds accordingly. We demonstrate that the optimum thresholds based on both modes give similar performances and are far better than the case of no thresholding. We also consider the performance of the proposed thresholding techniques for network-channel coded systems. We present several numerical examples that illustrate the efficacy of employing thresholding at the relay nodes (for networks with and without channel coding).",
keywords = "Cooperative communications, error propagation, network coding, relay networks, threshold-based relaying",
author = "Nguyen, {Sinh Le Hong} and Ali Ghrayeb and Ghaleb Al-Habian and Mazen Hasna",
year = "2010",
month = "11",
doi = "10.1109/TWC.2010.090210.091464",
language = "English",
volume = "9",
pages = "3380--3390",
journal = "IEEE Transactions on Wireless Communications",
issn = "1536-1276",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "11",

}

TY - JOUR

T1 - Mitigating error propagation in two-way relay channels with network coding

AU - Nguyen, Sinh Le Hong

AU - Ghrayeb, Ali

AU - Al-Habian, Ghaleb

AU - Hasna, Mazen

PY - 2010/11

Y1 - 2010/11

N2 - In relay networks, error propagation at the relay nodes degrades the performance of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. Specifically, the relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These values are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We investigate the application of this technique to a network-coded two-way relay channel where the relay is assisting two sources simultaneously. We first consider network-coded systems without channel coding, and then consider network-channel coded systems. We examine two modes of thresholding, one based on the individual bits, and the other based on the combined bits. We provide the full analysis for the bit-error rate (BER) performance of both thresholding modes and optimize the thresholds accordingly. We demonstrate that the optimum thresholds based on both modes give similar performances and are far better than the case of no thresholding. We also consider the performance of the proposed thresholding techniques for network-channel coded systems. We present several numerical examples that illustrate the efficacy of employing thresholding at the relay nodes (for networks with and without channel coding).

AB - In relay networks, error propagation at the relay nodes degrades the performance of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. Specifically, the relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These values are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We investigate the application of this technique to a network-coded two-way relay channel where the relay is assisting two sources simultaneously. We first consider network-coded systems without channel coding, and then consider network-channel coded systems. We examine two modes of thresholding, one based on the individual bits, and the other based on the combined bits. We provide the full analysis for the bit-error rate (BER) performance of both thresholding modes and optimize the thresholds accordingly. We demonstrate that the optimum thresholds based on both modes give similar performances and are far better than the case of no thresholding. We also consider the performance of the proposed thresholding techniques for network-channel coded systems. We present several numerical examples that illustrate the efficacy of employing thresholding at the relay nodes (for networks with and without channel coding).

KW - Cooperative communications

KW - error propagation

KW - network coding

KW - relay networks

KW - threshold-based relaying

UR - http://www.scopus.com/inward/record.url?scp=78449272647&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78449272647&partnerID=8YFLogxK

U2 - 10.1109/TWC.2010.090210.091464

DO - 10.1109/TWC.2010.090210.091464

M3 - Article

VL - 9

SP - 3380

EP - 3390

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

SN - 1536-1276

IS - 11

M1 - 5581212

ER -