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Outage Probability and Ergodic Capacity of User Clustering and Beamforming MIMO-NOMA Relay System with Imperfect CSI over Nakagami-m Fading Channels

Hoang, T.M. and Nguyen, B.C. and Tran, X.N. and Dung, L.T. (2021) Outage Probability and Ergodic Capacity of User Clustering and Beamforming MIMO-NOMA Relay System with Imperfect CSI over Nakagami-m Fading Channels. IEEE Systems Journal, 15 (2): 9153794. pp. 2398-2409. ISSN 19328184

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Abstract

Although the theory of nonorthogonal multiple access (NOMA) has been widely investigated, so far, there is a lack of applying beamforming into NOMA systems. In this article, we propose a multiple-input and multiple-output (MIMO)-NOMA system, where all users in the whole system are divided into multiple clusters to reduce the inner interference. Next, the superpositioned signals at base station are beamed to the relays, and then, the relays communicate with the users through superposition coding in the power domain. We derive the exact expressions of the outage probability of each user and the ergodic capacity (EC) of each cluster in both cases, i.e., perfect successive interference cancellation (SIC) and imperfect SIC, taking into account the Nakagami-m fading channels and imperfect channel state information (CSI). We also compare the outage performance and the EC of our proposed MIMO-NOMA relay system with an orthogonal multiple access (OMA) relay system. Monte Carlo simulations are used validate the derived mathematical expressions. Numerical results show that the outage performance and the EC of each user and the whole system are reduced remarkably due to the imperfect CSI but get better as the fading severity is less. Moreover, the EC of our proposed MIMO-NOMA relay system is higher than that of the OMA relay system. © 2020 IEEE.

Item Type: Article
Divisions: Faculties > Faculty of Radio-Electronic Engineering
Identification Number: 10.1109/JSYST.2020.3009700
Uncontrolled Keywords: Beamforming; Channel capacity; Fading channels; Monte Carlo methods; Outages; Imperfect channel state information; Mathematical expressions; Multiple input and multiple outputs; Nakagami-m fading channels; Outage performance; Outage probability; Successive interference cancellation(SIC); Super-position coding; Channel state information
Additional Information: Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/8634

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