Performance improvement of NOMA visible light communication system by adjusting superposition constellation: A convex optimization approach

Hao Ren, Zixiong Wang, She Du, Yuxuan He, Jian Chen, Shiying Han, Changyuan Yu, Chao Xu, Jinlong Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


Non-orthogonal multiple access (NOMA) can increase the overall spectral efficiency of visible light communication (VLC) system. In this paper, we propose a novel scheme to improve the bit error rate (BER) performance of a two-user NOMA VLC system by adjusting superposition constellation. The corresponding closed-form BER expressions are derived. Convex optimization is used to find the optimal parameters of the adjusted superposition constellation, where the overall BER is minimized. The BER performances are evaluated by theoretical analysis, Monte-Carlo (MC) simulation and experiment. The results illustrate that 8.9-dB and 8.1-dB signal-to-noise ratios (SNRs) are reduced to achieve BER of 10−3 for the two users, whose power allocation coefficients are 0.6 and 0.4, respectively.

Original languageEnglish
Pages (from-to)29796-29806
Number of pages11
JournalOptics Express
Issue number23
Publication statusPublished - 12 Nov 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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