LACO-OFDM With Index Modulation for Optical Wireless Systems

Azim, Ali Waqar; Guennec, Yannis Le; Chafii, Marwa; Ros, Laurent

doi:10.1109/lwc.2020.3045119

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…OFDM-DIM (OFDM with differential index modulation) achieves higher SE by mitigating the average number of used subcarriers with the method of removing the non-activated subcarriers at the end of each subblock [17]. LACO-OFDM-IM (Layered ACO-OFDM-IM) and FACO-OFDM-IM (filtered ACO-OFDM-IM) optimize the baseband bandwidth by filtering the out-of-band clipping harmonics to avoid spectral leakage and get higher SE [18], [19]. However, to pursue high spectral efficiency, these systems greatly increase the computational complexity and the difficulty of system implementation.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Frequency Division Multiplexing With Index Modulation Based on Discrete Hartley Transform in Visible Light Communications

Zhang

Yue

2022

IEEE Photonics J.

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This paper investigates optical orthogonal frequency division multiplexing (O-OFDM) systems with index modulation (IM) based on discrete Hartley transform (DHT) for visible light communications (VLC). An interesting trade-off between spectral efficiency (SE), energy efficiency, peak-to-average power ratio (PAPR) and bit error rate (BER) performance can be made by using the IM technique. And the DHT-based O-OFDM-IM systems can achieve higher SE compared with the DFT (discrete Fourier transform)-based counterparts. Employing DHT instead of DFT enables the removal of the Hermitian symmetry requirement, which contributes to transmitting more index bits and results in SE improvement. To acquire the same SE, the proposed systems can significantly lower the constellation order leading to better BER performance by contrast with the DFT-based counterparts. We employ DC (direct current) biasing and AC (Asymmetrically clipped) techniques to investigate the O-OFDM-IM systems in this paper. Simulation results indicate that SNR gains can be obtained by the DHT-based DCO/ACO-IM in comparison to the DFT-based counterparts.We also propose a novel reduced-complexity ML (maximum likelihood) detector specifically applicable to VLC. The new detector exhibits the same BER performance as the ML detector and performs better than the LLR (log-likelihood ratio) detector with reduced computational complexity.

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Section: Introductionmentioning

confidence: 99%

Orthogonal Frequency Division Multiplexing With Index Modulation Based on Discrete Hartley Transform in Visible Light Communications

Zhang

Yue

2022

IEEE Photonics J.

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“…To overcome this limitation, in [4], [5], we proposed enhanced IM variants of DCO-OFDM and ACO-OFDM, which substantially increase the SE relative to non-index modulated counterparts. Furthermore, in [6] and [7], we proposed filtered ACO-OFDM-IM and Layered ACO-OFDM-IM to improve the SE over the other IM and non-IM counterparts. Nonetheless, O-OFDM-IM is energy-efficient compared to O-OFDM only for low alphabet cardinalities [5].…”

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confidence: 99%

A Framework for Amalgamating Optical-OFDM and Optical-OFDM with Index Modulation for Optical Wireless Systems

Azim¹,

Guennec²,

Chafii³

et al. 2022

Preprint

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In this communication, we propose a framework for amalgamating optical-orthogonal frequencydivision multiplexing (O-OFDM) and O-OFDM with index modulation (O-OFDM-IM) for optical wireless systems. Both schemes individually have some limitations, e.g., O-OFDM does not provide any granularity for spectral efficiency (SE)/energy efficiency (EE) trade-off, and O-OFDM-IM loses EE for higher order modulation alphabets. By combining O-OFDM and O-OFDM-IM together, the above limitations can be circumvented. Following on from providing the general framework, we use asymmetrically clipped (AC)O-OFDM and ACO-OFDM-IM to demonstrate the validity of the framework. The results presented herein establish that, by consolidating O-OFDM and O-OFDM-IM, in addition to providing SE/EE trade-off, we may realise higher SE and outperform O-OFDM-IM in terms of EE for high SE.

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Optical orthogonal frequency division multiplexing with differential index modulation

Wang,

Tang

et al. 2025

Optics Communications

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LACO-OFDM With Index Modulation for Optical Wireless Systems

Cited by 8 publications

References 11 publications

Orthogonal Frequency Division Multiplexing With Index Modulation Based on Discrete Hartley Transform in Visible Light Communications

Orthogonal Frequency Division Multiplexing With Index Modulation Based on Discrete Hartley Transform in Visible Light Communications

A Framework for Amalgamating Optical-OFDM and Optical-OFDM with Index Modulation for Optical Wireless Systems

Optical orthogonal frequency division multiplexing with differential index modulation

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