Deakin University
Browse

File(s) under permanent embargo

Subcarrier and power allocation scheme for downlink OFDM-NOMA systems

journal contribution
posted on 2017-02-01, 00:00 authored by W Cai, C Chen, L Bai, Y Jin, Jinho ChoiJinho Choi
In this study, the authors investigate the resource allocation (RA) problem for the downlink orthogonal frequency division multiplexing based non-orthogonal multiple access (OFDM-NOMA) system. The RA problem is decomposed into two subproblems of subcarrier allocation (SA) and power allocation (PA). For the SA, a user grouping based greedy algorithm is proposed under the assumption that power is uniformly distributed among all the selected users. For the PA, the authors propose the iterative water-filling and specific user rate maximising criterion with minimum rate constraints (iterative WF + SURMC-MRC) scheme to jointly consider the PA problem among the selected users on one subcarrier and the PA problem among subcarriers. The simulation results show that the spectral efficiency performance of the proposed iterative WF + SURMC-MRC scheme outperforms those of the (non-iterative) WF + SURMC-MRC scheme and the uniform distribution (UD) + SURMC-MRC scheme. Moreover, the iterative WF + SURMC-MRC scheme has advantages in resisting against the user overloading compared with the (non-iterative) WF + SURMC-MRC scheme.

History

Journal

IET signal processing

Volume

11

Issue

1

Pagination

51 - 58

Publisher

Institution of Engineering and Technology

Location

Stevenage, Eng.

ISSN

1751-9675

eISSN

1751-9683

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2017, The Institution of Engineering and Technology