Title: Exploiting hybrid decode-and-forward – amplify-and-forward in NOMA: an application to device-to-device networks

Authors: Huu-Phuc Dang; Minh-Sang V. Nguyen; Dinh-Thuan Do; Hong-Lien Pham

Addresses: Faculty of Electrical and Electronics Technology, Ho Chi Minh City University of Technology and Education, Vietnam; Tra Vinh University, No. 126, Nguyen Thien Thanh, Ward 5, Tra Vinh City, Tra Vinh Province, Vietnam ' Faculty of Electronics Technology, Vietnam Industrial University of Ho Chi Minh City (IUH), Vietnam ' Wireless Communications Research Group; Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam ' Faculty of Electrical and Electronics Technology, Ho Chi Minh City University of Technology and Education, Vietnam

Abstract: A novel model regarding downlink cooperative non-orthogonal multiple access (NOMA) in device-to-device network will be investigated in this paper, especially combining amplify-and-forward (AF) and decode-and-forward (DF) to achieve a hybrid scheme. We consider a remarkable trade-off between outage performances and power allocation factors. Especially, we study a hybrid AF and DF scheme, namely HDAF scheme for NOMA as follows: 1) The proposed scheme applies the AF scheme when the signal-to-interference-plus-noise ratio (SINR) at the relay is below a predefined threshold such that the relay cannot successfully decode the signal; 2) On the other hand, when the SINR at the relay is greater than the predefined threshold, the system will be applied the DF scheme to decode the signal and then forwards it to the destination, i.e., avoids noise and interference amplification at the relay. An analytical expression of the outage probability of the hybrid HDAF NOMA is derived based on the outage probability function in AF and DF mode. Numerical results are provided to illustrate the influence of network parameters such as transmit power, power constraint, and link distances on the outage probability.

Keywords: outage probability; D2D communications; non-orthogonal multiple access; NOMA.

DOI: 10.1504/IJCNDS.2020.108873

International Journal of Communication Networks and Distributed Systems, 2020 Vol.25 No.2, pp.145 - 163

Received: 22 Oct 2018
Accepted: 20 Mar 2019
Published online: 05 Aug 2020 *

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