Abstract
We focus on a multiway relay channel (MWRC) network where two or more users simultaneously exchange information with each other through the help of a relay node. We propose for the first time to apply ternary uniquely decodable (UD) code sets that we have developed to allow each user to uniquely recover the information bits from the noisy channel environment. One of the key features of the proposed scheme is that it utilizes a very simple decoding algorithm, which requires only a few logical comparisons. Simulation results in terms of bit error rate (BER) demonstrate that the performance of the proposed decoder is almost as good as the maximum‐likelihood (ML) decoder. In addition to that through simulations, we show that the proposed scheme can significantly improve the sum‐rate capacity, which in turn can potentially improve overall throughput, as it needs only two time slots (TSs) to exchange information compared to the conventional methods.
Highlights
Network coding (NC) has attracted a lot of attention in the research community due to its capability to enhance the throughput of lossless wireline networks in a multicast environment [1]
Simulation results in terms of bit error rate (BER) demonstrate that the performance of the proposed decoder is very close to the maximum-likelihood (ML) decoder
We have proposed to apply a ternary uniquely decodable (UD) code sets to a multiway relay channel (MWRC) network where two or more users are able to exchange information with each other simultaneously through the help of a relay node
Summary
Network coding (NC) has attracted a lot of attention in the research community due to its capability to enhance the throughput of lossless wireline networks in a multicast environment [1]. Denoise-and-forward (DNF) relaying adopting the physical-layer network coding (PNC) proposed by Zhang et al [6] can potentially provide further throughput improvements of the wireless channel. The simulation and experiment results demonstrate that their proposed scheme can significantly improve the channel utilization by up to 50% for unidirectional and 100% for bidirectional networks compared to the conventional DS-CDMA scheme. The concept of Wireless Communications and Mobile Computing a multiway relay channel (MWRC), which was introduced in [11], is a generalization of a TWRC, where K > 2 users simultaneously aim to achieve full information exchange with the help of a single relay node. Through simulations, we show that the proposed scheme can significantly improve the sumrate capacity, which in turn can potentially improve overall throughput, as it needs only two TSs to exchange information compared to the conventional methods. All boldface lower case letters indicate column vectors and upper case letters indicate matrices, ( )T denotes transpose operation, C denotes the set of all complex numbers, ∗ denotes conjugate, sgn denotes the sign function, |⋅| denotes complex amplitude, and ⌊⋅⌋, ⌈⋅⌉ are the floor and ceiling functions, respectively
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