A Low-Complex and Power-Efficient Optical OFDM for VLC Systems

Commercially available Light Emitting Diode (LED) luminaries requires both high power efficiency and low complexity from Visible Light Communication (VLC) system deployments. Asymmetrically-clipped Direct-current (DC) biased Optical-OFDM (ADO-OFDM) is a recently emerged waveform in VLC systems to ac...

Full description

Saved in:
Bibliographic Details
Published in:Journal of lightwave technology 2024-12, p.1-9
Main Authors: Miriyala, Ganesh, Mallaiah, Renikunta, Sathyaprasad, Abhaynarasimha Karnam, Vejandla, Kishore, Vakamulla, Venkata Mani
Format: Article
Language:English
Subjects:
Low complexity
Modulation
Noise
OFDM
Optical distortion
Optical modulation
power efficiency
Quadrature amplitude modulation
Symbols
Time-domain analysis
variably-biased asymmetrically-clipped optical-OFDM (VAO-OFDM)
Vectors
Visible light communication
visible light communications (VLC)
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Commercially available Light Emitting Diode (LED) luminaries requires both high power efficiency and low complexity from Visible Light Communication (VLC) system deployments. Asymmetrically-clipped Direct-current (DC) biased Optical-OFDM (ADO-OFDM) is a recently emerged waveform in VLC systems to achieve the optimal solution for spectral and power efficiency problems. However, in ADO-OFDM, a high DC bias is used to attain uni-polar signals which decrease the power efficiency. In this work, we conceive a novel modulation technique called Variably-biased Asymmetrically-clipped Optical OFDM (VAO-OFDM) with pre-distortion for VLC systems. In VAO-OFDM, we design a variably bias which depends on specific samples. Variably bias does not enforce any interference on the originally transmitted symbols because of its frequency components falling on the pre-defined sub-carriers. Due to the pre-distortion process, the computational-complexity of proposed VAO-OFDM is decreased considerably over the ADO-OFDM. Further, the VAO-OFDM and ADO-OFDM performance is evaluated in terms of Bit Error Rate (BER) and power efficiency using MATLAB simulations and validated on the experimental setup by the LabView software-based VLC testbed. Simulation results show that the VAO-OFDM gains SNR of 10dB at a BER of 10^{-3} over the ADO-OFDM, and experimental results show that the BER performance of VAO-OFDM and ADO-OFDM is obtained as 1.02 \times 10^{-3} and 5.18 \times 10^{-5} at a signal bandwidth of 1MHz. Therefore, the VAO-OFDM performance is enhanced substantially when compare to ADO-OFDM.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2024.3521952