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http://dx.doi.org/10.3837/tiis.2021.01.020

A Spectral Efficient NOMA-based Two-Way Relaying Scheme for Wireless Networks with Two Relays  

Li, Guosheng (School of Intelligent Information Engineering Zhejiang Wanli University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.15, no.1, 2021 , pp. 365-382 More about this Journal
Abstract
This paper proposes a novel two-way relaying (TWR) approach for a two-relay wireless network based on non-orthogonal multiple access (NOMA), where two terminals exchange messages with a cellular base station (BS) via two intermediate relay stations (RSs). We propose a NOMA-based TWR approach with two relaying schemes, i.e., amplify-and-forward (AF) and decode-and-forward (DF), referred to as NOMA-AF and NOMA-DF. The sum-rate performance of our proposed NOMA-AF and NOMA-DF is analyzed. A closed-form sum-rate upper bound for the NOMA-AF is obtained, and the exact ergodic sum-rate of NOMA-DF is also derived. The asymptotic sum-rate of NOMA-AF and NOMA-DF is also analyzed. Simulation results show that the proposed scheme outperforms conventional orthogonal multiple access based transmission schemes. It is also shown that increasing the transmit power budget of the relays only cannot always improve the sum-rates.
Keywords
NOMA; Successive Interference Cancellation; Sum-Rate Performance; Two-Way Relay;
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Times Cited By KSCI : 1  (Citation Analysis)
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