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http://dx.doi.org/10.3837/tiis.2021.05.020

Sum-Rate Performance of A NOMA-based Two-Way Relay Approach for A Two-User Cellular Network  

Li, Guosheng (School of Intelligent Information Engineering, Zhejiang WanliUniversity)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.15, no.5, 2021 , pp. 1944-1956 More about this Journal
Abstract
This paper considers a cellular two-way relay network with one base station (BS), one relay station (RS), and two users. The two users are far from the BS and no direct links exist, and the two users exchange messages with the BS via the RS. A non-orthogonal multiple access (NOMA) and network coding (NC)-based decode-and-forward (DF) two-way relaying (TWR) scheme TWR-NOMA-NC is proposed, which is able to reduce the number of channel-uses to three from four in conventional time-division multiple access (TDMA) based TWR approaches. The achievable sum-rate performance of the proposed approach is analyzed, and a closed-form expression for the sum-rate upper bound is derived. Numerical results show that the analytical sum-rate upper bound is tight, and the proposed TWR-NOMA-NC scheme significantly outperforms the TDMA-based TWR and NOMA-based one-way relaying counterparts.
Keywords
cellular two-way relay; NOMA; decode-and-forward; sum-rate performance;
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