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.
Highlights
Wireless sensor networks (WSNs) consist of spatially-distributed autonomous sensors which cooperatively monitor physical or environmental conditions, and they have been identified as one of the most important enabling technologies for constructing smart cities
We present the numerical results in terms of BP decoding thresholds and bit erasure rates (BERs) for the proposed MET nested spatially-coupled LDPC (SC-LDPC) codes
We proposed multi-edge-type spatially-coupled LDPC codes through coset encoding for the multiway relay channel with full data exchange
Summary
Wireless sensor networks (WSNs) consist of spatially-distributed autonomous sensors which cooperatively monitor physical or environmental conditions, and they have been identified as one of the most important enabling technologies for constructing smart cities. One important feature of WSNs is that the sensor nodes collaborate in some manner for information transmissions. Much of research on the physical-layer techniques has focused on relaying, which is an efficient cooperative strategy to improve throughput and coverage of the sensor network. The two-way relaying, known as bidirectional relaying [2], is another type of cooperative strategy. As a generalization of the two-way relay channel, the multiway relay channel (mRC) has been investigated in [3]. In the mRC, multiple users exchange information with the help of a relay terminal. In a social network, different users exchange their personal information through a coordinator
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