Dimming control scheme based on hybrid LACO-SCFDM for visible light communications

Siqiao Li; Tiantian Zhang; Yaojun Qiao; Ji Zhou

doi:10.3788/COL202119.040601

Journals >Chinese Optics Letters >Volume 19 >Issue 4 >Page 040601 > Article

Chinese Optics Letters
Vol. 19, Issue 4, 040601 (2021)

Dimming control scheme based on hybrid LACO-SCFDM for visible light communications

Siqiao Li¹, Tiantian Zhang², Yaojun Qiao^1、*, and Ji Zhou³

Author Affiliations

¹Beijing Key Laboratory of Space-Ground Interconnection and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

²Institute of Electronic and Information Industry, China Center for Information Industry Development, Beijing 100876, China

³Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China

show less

DOI: 10.3788/COL202119.040601 Cite this Article Set citation alerts

Siqiao Li, Tiantian Zhang, Yaojun Qiao, Ji Zhou. Dimming control scheme based on hybrid LACO-SCFDM for visible light communications[J]. Chinese Optics Letters, 2021, 19(4): 040601 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Abstract

This paper proposes a hybrid layered asymmetrically clipped optical (HLACO) single-carrier frequency-division multiplexing (SCFDM) scheme for dimmable visible light communication. It designs a signal structure that combines layered asymmetrically clipped optical (LACO)-SCFDM and negative LACO-SCFDM in proportion for improving the inherent weaknesses of orthogonal frequency-division multiplexing (OFDM)-based dimmable schemes and further enhancing the system performance. Compared to the HLACO-OFDM-based dimming scheme, it obtains a lower bit error ratio and enables efficient communication over broader dimming range. Its spectral efficiency realizes 2.875 bit·s^-1·Hz^-1 within the dimming range of 30%–70%, and the attainable average spectral efficiency gains exceed at least 19.21% compared to other traditional dimmable schemes.

Keywords

complexity dimming control single-carrier frequency-division multiplexing spectral efficiency visible light communication

y_{ACO, i}^{(l)} = {⌊ y_{i}^{(l)} ⌋}_{c} = {\begin{matrix} y_{i}^{(l)}, & y_{i}^{(l)} \geq 0 \\ 0, & y_{i}^{(l)} < 0 \end{matrix} .

(1)

View in Article

I_{D} = (1 - α) \cdot (I_{L} + z_{LACO}^{'}) + α \cdot (I_{H} + z_{Negative LACO}^{'}),

(2)

View in Article

z_{LACO}^{'} = \sum_{l = 1}^{L} \frac{y_{ACO}^{(l)}}{σ_{RMS, ACO}^{(l)}} \cdot \frac{I_{H} - I_{L}}{ρ_{LACO}^{(l)}}, z_{Negative LACO}^{'} = \sum_{l = 1}^{L} \frac{y_{Negative ACO}^{(l)}}{σ_{RMS, Negative ACO}^{(l)}} \cdot \frac{I_{H} - I_{L}}{ρ_{Negative LACO}^{(l)}},

(3)

View in Article

η = \frac{I_{D} - I_{L}}{I_{H} - I_{L}} = α + \frac{1}{I_{H} - I_{L}} [(1 - α) \cdot (\sum_{l = 1}^{L} \frac{y_{ACO}^{(l)}}{σ_{RMS, ACO}^{(l)}} \cdot \frac{I_{H} - I_{L}}{ρ_{LACO}^{(l)}}) + α \cdot (\sum_{l = 1}^{L} \frac{y_{Negative ACO}^{(l)}}{σ_{RMS, Negative ACO}^{(l)}} \cdot \frac{I_{H} - I_{L}}{ρ_{Negative LACO}^{(l)}})] .

(4)

View in Article

ξ_{SEsc} = \sum_{l = 1}^{L} \frac{\log_{2} M_{sc, l}}{2^{l}}, ξ_{SEo} = \sum_{l = 1}^{L} \frac{\log_{2} M_{o, l}}{2^{l + 1}},

(5)

View in Article

Δ {\bar{ξ}}_{S E} = \sum_{n = 1}^{N} (ξ_{sc, n}^{SE} - ξ_{oth, n}^{SE}) / \sum_{n = 1}^{N} ξ_{oth, n}^{SE},

(6)

View in Article

Siqiao Li, Tiantian Zhang, Yaojun Qiao, Ji Zhou. Dimming control scheme based on hybrid LACO-SCFDM for visible light communications[J]. Chinese Optics Letters, 2021, 19(4): 040601

Download Citation

EndNote(RIS)

BibTex

Plain Text

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information