Outage Analysis for Downlink Non-Orthogonal Multiple Access (NOMA) with CDF-Based Scheduling

Byungju Lim, Sung Sik Nam, Young Chai Ko, Mohamed Slim Alouini

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this letter, we statistically analyze the outage performance of non-orthogonal multiple access (NOMA) with CDF-based scheduling (CS) over Nakagami-m fading channels. Based on our system model assumptions, CS selects the multiple users based on CDF of channel gain, which guarantees fair resource allocation. With this CS algorithm, the closed-form of outage is derived to show the effect of CS. Specifically, we first analyze the selection probability of each user and, via the derived distribution results, statistically investigate the outage performance when two users are selected. In addition, we obtain the diversity order that is affected by both the weights of each user and the m parameter of Nakagami-m fading channel. Our analytical results are thoroughly validated by cross-checking them against the results obtained via the Monte-Carlo simulations. Some selected results show that CS exploits multiuser diversity.

Original languageEnglish
Article number8982077
Pages (from-to)822-825
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number6
Publication statusPublished - 2020 Jun

Bibliographical note

Funding Information:
Manuscript received January 15, 2020; accepted January 27, 2020. Date of publication February 4, 2020; date of current version June 10, 2020. This work was supported by a grant-in-aid of HANWHA SYSTEMS. The associate editor coordinating the review of this article and approving it for publication was C. Huang. (Sung Sik Nam is co-first author.) (Corresponding author: Young-Chai Ko.) Byungju Lim and Young-Chai Ko are with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: limbj93@korea.ac.kr; koyc@korea.ac.kr).

Publisher Copyright:
© 2020 IEEE.


  • CDF-based scheduling
  • NOMA
  • Nakagami-m fading
  • diversity order
  • outage

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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