Recent Advances for 5G: Emerging Scheme of NOMA in Cognitive Radio and Satellite Communications

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: closed (30 November 2019) | Viewed by 5751

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Guest Editor
Faculty of Electrical Engineering and Computer Science, VSB – Technical University of Ostrava, 708 00 Ostrava, Czech Republic
Interests: wireless communication; Internet of things; energy harvesting; network security; big data analytics in networks
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Dear Colleagues,

An explosive demand is anticipated for the fifth generation (5G) wireless communication networks, which are expected to be of improved spectrum efficiency. In term of network access technique, non-orthogonal multiple access (NOMA) is recognized as a promising candidate applied in 5G. Take power domain NOMA as an example, where the power domain is implemented for multiple access. Such an NOMA is fundamentally different compared to the previous networks, which have been relying on the time/frequency/code domain. In principle, NOMA simultaneously allocates a multitude of users with the same radio resource. At the transmission side, superposition signaling is required, while signal processing techniques at the reception side are studied to mitigate the interference.

Driven by new multiple access applied in 5G, the applications of NOMA need to be investigated in traditional networks, such as cognitive radio and satellite systems. Although numerous techniques related to NOMA have been widely introduced in recent years, there are still many unsolved problems. To bridge this gap, researchers are motivated to study new transmission schemes for two specific kinds of networks, including cognitive radio and satellite systems. Among others, NOMA-based cognitive radio (CR) networks have recently emerged as a promising solution to enhance the spectral efficiency and fix the massive connectivity problems, as well as a NOMA-based integrated terrestrial-satellite network, in which the NOMA-based terrestrial networks and the satellite cooperatively provide coverage for ground users while employing the entire bandwidth.

Based on reports from recent works, NOMA is a promising candidate to achieve massive connectivity and high spectral efficiency for future wireless communications. However, new signal processing problems need to be solved in order for us to benefit from the advantages of NOMA technologies for future deployments of 5G. This Special Issue in Electronics aims to capture the state-of-the-art advances in NOMA, particularly from the perspective of two considered networks.

Dr. Dinh-Thuan Do
Prof. Dr. Miroslav Voznak
Guest Editors

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Keywords

  • non-orthogonal multiple access (NOMA)
  • cognitive radio
  • satellite systems

Published Papers (2 papers)

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15 pages, 518 KiB  
Article
Transmit Antenna Selection Schemes for NOMA with Randomly Moving Interferers in Interference-Limited Environment
by Dinh-Thuan Do, Thanh-Luan Nguyen and Byung Moo Lee
Electronics 2020, 9(1), 36; https://doi.org/10.3390/electronics9010036 - 27 Dec 2019
Cited by 7 | Viewed by 2563
Abstract
In this paper, non-orthogonal multiple access (NOMA) is studied at downlink under impact of surrounding interference. This study benefits the practical NOMA system since spatially random interference is adopted. More specifically, we consider the antenna selection strategy applied at the base station and [...] Read more.
In this paper, non-orthogonal multiple access (NOMA) is studied at downlink under impact of surrounding interference. This study benefits the practical NOMA system since spatially random interference is adopted. More specifically, we consider the antenna selection strategy applied at the base station and compare the performance of two users. By applying a stochastic geometry-based model, homogeneous Poisson point process (PPP) is employed to consider the spatial topology of interference which is located near to users, and such a model is extremely suitable for practical consideration. We first consider outage probability and then ergodic capacity is examined as main metrics to recommend such model in practice. According to the considered antenna section scheme of the base station, we compare these schemes related to selected antenna serving each user. To confirm exactness of derived expressions, we perform Monte Carlo simulations to verify the analytical results. Full article
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17 pages, 1540 KiB  
Article
Security Analysis of Multi-Antenna NOMA Networks Under I/Q Imbalance
by Xingwang Li, Mengle Zhao, Changsen Zhang, Wali Ullah Khan, Jun Wu, Khaled M. Rabie and Rupak Kharel
Electronics 2019, 8(11), 1327; https://doi.org/10.3390/electronics8111327 - 11 Nov 2019
Cited by 18 | Viewed by 2592
Abstract
This paper investigates the reliability and security performance of the downlink non-orthogonal multiple access (NOMA) networks over Nakagami-m fading channels, where the base station (BS) aims to communicate with multi-antenna NOMA users in the presence of a multi-antenna eavesdropper. To be more [...] Read more.
This paper investigates the reliability and security performance of the downlink non-orthogonal multiple access (NOMA) networks over Nakagami-m fading channels, where the base station (BS) aims to communicate with multi-antenna NOMA users in the presence of a multi-antenna eavesdropper. To be more practical, a detrimental factor at both transmitter and receiver is considered, namely in-phase and quadrature-phase imbalance (IQI). To further improve the reliability and security of the considered networks, the selection combining (SC) algorithm at the receiver is taken into account. More specifically, the exact analytical expressions for the outage probability (OP) and the intercept probability (IP) are derived in closed-form. To obtain a better understanding of the influence for the IQI parameters on the system performance, the asymptotic behaviors for the outage probabilities (OPs) in the high signal-to-noise ratio (SNR) region are analyzed. Based on the asymptotic results, the diversity order of the considered system are obtained and discussed. The numerical results are presented to verify the validity of the theoretical analysis. Full article
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