Fine-grained spectral-efficient adaptive DMIM-OFDM for VLC via non-power-of-two constellation design.

Authors

Ke Yao, Tiantian Chu, Chen Chen, Niancheng Zhou, Tamer Elbatt, Jia Ye

Published in

Optics letters. Volume 51. Issue 15. Pages 4288-4291. Aug 01, 2026.

Abstract

To address the issue of channel resource wastage caused by coarse spectral efficiency (SE) granularity in adaptive visible light communication (VLC) systems, this Letter proposes a fine-grained SE adaptive DMIM-OFDM scheme via non-power-of-two constellation design. Specifically, a concentric-circle-based non-power-of-two dual-mode constellation is designed to achieve integer SEs. Combined with conventional power-of-two constellations, it reduces the adaptation granularity from 1 bit/s/Hz to 0.5 bit/s/Hz, enabling more precise signal-to-noise ratio matching. Simulation and experimental results demonstrate that the proposed fine-grained scheme consistently outperforms the 1 bit/s/Hz granularity scheme, achieving a transmission rate gain of up to 7.45%.

PMID:
42537170
Bibliographic data and abstract were imported from PubMed on 01 Aug 2026.

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