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Sensors 2015, 15(7), 15265-15284; doi:10.3390/s150715265

Coded Cooperation for Multiway Relaying in Wireless Sensor Networks

1
Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications (BUPT), 100876 Beijing, China
2
School of Electrical Engineering and ACCESS Linnaeus Center, KTH Royal Institute of Technology, 10044 Stockholm, Sweden
This paper is an extended version of the paper entitled “Bidirectional broadcasting by using multi-edge type LDPC convolutional codes”. In Proceedings of IEEE International Symposium on Turbo Codes and Related Topics, Gothenburg, Sweden, 27–31 August 2012.
*
Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 7 May 2015 / Revised: 10 June 2015 / Accepted: 23 June 2015 / Published: 29 June 2015
(This article belongs to the Section Physical Sensors)
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Abstract

Wireless sensor networks have been considered as an enabling technology for constructing smart cities. One important feature of wireless sensor networks is that the sensor nodes collaborate in some manner for communications. In this manuscript, we focus on the model of multiway relaying with full data exchange where each user wants to transmit and receive data to and from all other users in the network. We derive the capacity region for this specific model and propose a coding strategy through coset encoding. To obtain good performance with practical codes, we choose spatially-coupled LDPC (SC-LDPC) codes for the coded cooperation. In particular, for the message broadcasting from the relay, we construct multi-edge-type (MET) SC-LDPC codes by repeatedly applying coset encoding. Due to the capacity-achieving property of the SC-LDPC codes, we prove that the capacity region can theoretically be achieved by the proposed MET SC-LDPC codes. Numerical results with finite node degrees are provided, which show that the achievable rates approach the boundary of the capacity region in both binary erasure channels and additive white Gaussian channels. View Full-Text
Keywords: wireless sensor networks; multiway relay channel; capacity region; coset encoding; multi-edge-type LDPC codes; spatially-coupled LDPC codes wireless sensor networks; multiway relay channel; capacity region; coset encoding; multi-edge-type LDPC codes; spatially-coupled LDPC codes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Si, Z.; Ma, J.; Thobaben, R. Coded Cooperation for Multiway Relaying in Wireless Sensor Networks. Sensors 2015, 15, 15265-15284.

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