Title: Effect of user mobility under Rician fading on power allocation for non-orthogonal multiple access strategy

Authors: Sandeep Singh Rana; Gaurav Verma; O.P. Sahu

Addresses: Department of Electronics and Communication, NIT – Kurukshetra, Haryana, 136119, India ' Department of Electronics and Communication, NIT – Kurukshetra, Haryana, 136119, India ' Department of Electronics and Communication, NIT – Kurukshetra, Haryana, 136119, India

Abstract: Non-orthogonal multiple access (NOMA) has been envisaged as a promising technique to meet the demand for massive machine-type communication (mMTC) devices. However, designing a NOMA system required a proper comprehensive study of user mobility, user switching, and imperfect successive interference cancellation (Im-SIC). In this paper, the effect of user mobility and Rician fading channel on power allocation for non-orthogonal multiple access (PA-NOMA) strategy is thoroughly investigated. This paper also discusses the challenges faced during the power allocation to multiple NOMA users. Mobility of the users violates the basic channel gain conditions of the NOMA users, therefore, to maintain the fairness index of the individual cell edge users, dynamic power allocation strategy is adopted. Simulation results show that user mobility and Im-SIC have a significant effect on the PA-NOMA strategy for multiple users in terms of sum-rate capacity, average bit error rate, and fairness index.

Keywords: fairness index; PA-NOMA; imperfect SIC; Rician fading; user mobility; user switching.

DOI: 10.1504/IJCNDS.2024.135081

International Journal of Communication Networks and Distributed Systems, 2024 Vol.30 No.1, pp.70 - 84

Received: 09 Feb 2022
Accepted: 11 Dec 2022
Published online: 30 Nov 2023 *