Performance analysis and SINR-based power allocation strategies for downlink NOMA networks

This study analyses the performance of downlink non-orthogonal multiple-access (NOMA) networks over independent but not necessarily identically distributed Rayleigh fading channels by deriving closed-form expressions for the average signal-to-interference-plus-noise ratio (SINR), average achievable...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:IET communications Jg. 14; H. 5; S. 723 - 735
Hauptverfasser: Baidas, Mohammed W, Alsusa, Emad, Hamdi, Khairi A
Format: Journal Article
Sprache:Englisch
Veröffentlicht: The Institution of Engineering and Technology 17.03.2020
Schlagworte:
closed‐form expressions
concave programming
convex optimisation problems
convex programming
downlink NOMA networks
downlink nonorthogonal multiple‐access networks
identically distributed Rayleigh fading channels
intelligent reformulation techniques
linear programming
linear‐fractional programming problems
minimisation
minimum SINR constraints
multi‐access systems
numerical analysis
numerical evaluations
outage probability
probability
proportional‐fairness‐SINR maximisation
radiofrequency interference
Rayleigh channels
reformulated power allocation strategies
Research Article
signal‐to‐interference‐plus‐noise ratio
SINR‐based power allocation strategies
sum‐SINR minimisation
sum-SINR minimisation
linear-fractional programming problems
probability
Rayleigh channels
convex optimisation problems
convex programming
linear programming
closed-form expressions
minimum SINR constraints
identically distributed Rayleigh fading channels
radiofrequency interference
intelligent reformulation techniques
downlink nonorthogonal multiple-access networks
outage probability
downlink NOMA networks
numerical analysis
proportional-fairness-SINR maximisation
reformulated power allocation strategies
numerical evaluations
multi-access systems
signal-to-interference-plus-noise ratio
minimisation
concave programming
SINR-based power allocation strategies
ISSN:1751-8628, 1751-8636
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:This study analyses the performance of downlink non-orthogonal multiple-access (NOMA) networks over independent but not necessarily identically distributed Rayleigh fading channels by deriving closed-form expressions for the average signal-to-interference-plus-noise ratio (SINR), average achievable rate, and outage probability of all network users. Moreover, SINR-based power allocation strategies are studied. Specifically, the optimisation problems of max–min SINR, multi-objective SINR, sum-SINR and proportional-fairness-SINR maximisation under minimum SINR constraints are formulated and shown to be non-convex. Additionally, the problems of total power and sum-SINR minimisation are also formulated. Particularly, the formulated problems take the form of linear-fractional programming problems. By applying intelligent reformulation techniques, these problems have been reformulated into convex optimisation problems, and thus efficiently solved. Numerical evaluations are presented to validate the derived closed-form expressions for the different performance metrics, which are found to be in agreement with the network simulation results. More importantly, it has been demonstrated that the user with the best channel conditions achieves full diversity order, whereas all the other users achieve diversity orders equivalent to their ordered channel conditions. Finally, the reformulated power allocation strategies are evaluated, and shown to coincide with the original problem formulations.
ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2018.6112