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http://dx.doi.org/10.3837/tiis.2022.09.016

Coordinated Direct and Relayed Transmission based on NOMA and Backscattering  

Fang, Zhaoxi (Department of Computer Science and Engineering, Shaoxing University)
Lu, Yingzhi (Department of Computer Science and Engineering, Shaoxing University)
Zhou, Jing (Department of Computer Science and Engineering, Shaoxing University)
Li, Qi (Department of Computer Science and Engineering, Shaoxing University)
Shi, Haiyan (Department of Computer Science and Engineering, Shaoxing University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.16, no.9, 2022 , pp. 3124-3137 More about this Journal
Abstract
We propose a spectral-efficient coordinated direct and relayed transmission (CDRT) scheme for a relay-assisted downlink system with two users. The proposed scheme is based on backscatter communication (BC) and non-orthogonal multiple access (NOMA) technique. With the proposed BC-NOMA-CDRT scheme, both users can receive one packet within one time slot. In contrast, in existing NOMA-CDRT schemes, the far user is only able to receive one packet in two time slots due to the half-duplex operation of the relay. We investigate the outage of the BC-NOMA-CDRT scheme, and derive the outage probability expressions in closed-form based on Gamma distribution approximation and Gaussian approximation. Numerical results show that the analytical results are accurate and the BC-NOMA-CDRT scheme outperforms the conventional NOMA-CDRT significantly.
Keywords
Backscatter communication; coordinated direct and relayed transmission; NOMA;
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