Title: Exact outage performance of two NOMA users in small-cell network over Nakagami-m fading under imperfect CSI

Authors: Chi-Bao Le; Tu-Trinh Thi Nguyen; Dinh-Thuan Do

Addresses: Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City, Vietnam ' Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City, Vietnam ' Wireless Communications Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

Abstract: We consider a two-user system in the scenario of relay cooperative non-orthogonal multiple access (NOMA) network with imperfections of channel state information (CSI). Firstly, on the same allocated power source, the base station (BS) transmits the superposition signal to near user and far user, which is analysed via Nakagami-m fading channels. In this situation, the near user with good channel conditions employs NOMA scheme to serve the far user. Secondly, the far user combines signals from direct link and relay link. Then, the outage performance is examined in closed-form expressions to exhibit performance gap among two NOMA users.

Keywords: non-orthogonal multiple access; NOMA; decode-and-forward; Nakagami-m fading; outage probability.

DOI: 10.1504/IJICT.2022.123158

International Journal of Information and Communication Technology, 2022 Vol.20 No.4, pp.411 - 422

Received: 22 Oct 2019
Accepted: 22 Sep 2020

Published online: 01 Jun 2022 *

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