Low-complexity user pairing and power allocation algorithm for 5G cellular network non-orthogonal multiple access

Jianhua He, Zuoyin Tang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Non-orthogonal multiple access (NOMA) is a candidate technology for the 5th generation cellular networks to reduce the big gap between network capacity and fast growing traffic. It applies superposition coding in transmitters and successive interference cancellation at the receivers to cancel intra-cell interference. The same frequency resource can be allocated simultaneously to multiple intra-cell users, holding large potentials on improving network performance. A major technical challenge of NOMA is on user pairing and power allocation (UPPA). Most of existing UPPA algorithms are based on exhaustive search with extensive computation. A new algorithm, which has the lowest computation complexity achievable for NOMA UPPA is proposed. The main idea is to pair the first users having the highest proportional fairness priority coefficient with potential second users having the highest channel conditions. A fixed power allocation strategy is adopted. The proposed algorithm is significantly faster than existing algorithms without sacrificing NOMA throughput gain.

Original languageEnglish
Pages (from-to)626-627
Number of pages2
JournalElectronics letters
Issue number9
Early online date27 Mar 2017
Publication statusPublished - 27 Apr 2017

Bibliographical note

This paper is a postprint of a paper submitted to and accepted for publication in Electronics Letters and it is subject to Institution of Engineering and Techinology Copyright. The copy of record is available at the IET Digital Library.


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