research-article

Joint bit and power loading for adaptive MIMO OFDM VLC systems

Authors:

Umair F. Siddiqi,

Omer Narmanlioglu,

Sadiq M. SaitAuthors Info & Claims

Transactions on Emerging Telecommunications Technologies, Volume 31, Issue 7

https://doi.org/10.1002/ett.3850

Published: 08 July 2020 Publication History

Abstract

Visible light communication (VLC) is a short‐range wireless access technology based on the dual use of illumination structure. The frequency‐selective characteristics of VLC channels motivate the use of orthogonal frequency division multiplexing (OFDM). In addition, the presence of multiple light sources in most indoor spaces makes multiple‐input–multiple‐output (MIMO) communication techniques a natural solution for VLC systems. In this paper, we investigate the design of an adaptive MIMO OFDM system. Specifically, we propose adaptive bit and power loading for a direct current–biased OFDM VLC system with MIMO mode switching between repetition coding and spatial multiplexing. We formulate the adaptive algorithm design as an optimization problem where we aim to maximize spectral efficiency through the proper selection of modulation order, power level, and MIMO mode, while satisfying a targeted bit error rate. To solve the underlying NP‐hard problems, we use a simulated annealing heuristic. We present Monte Carlo simulation results for a typical indoor setting and illustrate the performance improvements through link adaptation.

Graphical Abstract

We propose an adaptive DCO‐OFDM system that maximizes spectral efficiency (SE) by applying the following steps. The first is the optimization of the power of the subcarriers using the Simulated Annealing algorithm. In the second and third steps, the system selects best modulation orders for the subcarriers based on a given BER value and determine SE value for both repetitive coding (RC) and spatial multiplexing (SM) modes. The system chooses either RC or SM mode, whichever yields better SE.

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Cited By

Sünnetci KSönmez M(2022)Variable pulse position modulation receivers for visible light communication systems without the knowledge of dimming levelTransactions on Emerging Telecommunications Technologies10.1002/ett.444533:5Online publication date: 27-May-2022
https://dl.acm.org/doi/10.1002/ett.4445
Dixit VKumar A(2022)BER performance of MIMO based NOMA‐VLC system with imperfect SICTransactions on Emerging Telecommunications Technologies10.1002/ett.442233:4Online publication date: 17-Apr-2022
https://dl.acm.org/doi/10.1002/ett.4422
Zhang XLiu JBa ZTao YCheng X(2022)MobiScanTransactions on Emerging Telecommunications Technologies10.1002/ett.415133:4Online publication date: 17-Apr-2022
https://dl.acm.org/doi/10.1002/ett.4151
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Joint bit and power loading for adaptive MIMO OFDM VLC systems

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Published In

cover image Transactions on Emerging Telecommunications Technologies

Transactions on Emerging Telecommunications Technologies Volume 31, Issue 7

July 2020

201 pages

ISSN:2161-3915

EISSN:2161-3915

DOI:10.1002/ett.v31.7

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© 2020 John Wiley & Sons, Ltd.

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John Wiley & Sons, Inc.

United States

Publication History

Published: 08 July 2020

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Cited By

Sünnetci KSönmez M(2022)Variable pulse position modulation receivers for visible light communication systems without the knowledge of dimming levelTransactions on Emerging Telecommunications Technologies10.1002/ett.444533:5Online publication date: 27-May-2022
https://dl.acm.org/doi/10.1002/ett.4445
Dixit VKumar A(2022)BER performance of MIMO based NOMA‐VLC system with imperfect SICTransactions on Emerging Telecommunications Technologies10.1002/ett.442233:4Online publication date: 17-Apr-2022
https://dl.acm.org/doi/10.1002/ett.4422
Zhang XLiu JBa ZTao YCheng X(2022)MobiScanTransactions on Emerging Telecommunications Technologies10.1002/ett.415133:4Online publication date: 17-Apr-2022
https://dl.acm.org/doi/10.1002/ett.4151
Eldeeb HAl‐Nahhal MSelmy HAbd El‐Samie F(2020)Continuous phase modulation with chaotic interleaving for visible light communication systems based on orthogonal frequency division multiplexingTransactions on Emerging Telecommunications Technologies10.1002/ett.410031:10Online publication date: 5-Oct-2020
https://dl.acm.org/doi/10.1002/ett.4100

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