Coordinated Direct and Relayed Transmission based on NOMA and Backscattering

• Zhaoxi Fang,
• Yingzhi Lu,
• Jing Zhou,
• Qi Li,
• Haiyan Shi,

Vol. 16, No. 9, September 30, 2022
10.3837/tiis.2022.09.016, Download Paper (Free):

• Backscatter communication
• coordinated direct and relayed transmission
• NOMA

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.

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