Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems
Visible Light Communication (VLC) is a data communication technology that modulates the intensity of the light to transmit the information mostly by means of Light Emitting Diodes (LEDs). The data rate is mainly throttled by the limited bandwidth of the LEDs. To combat, Multi-carrier Code Division M...
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doaj-8dc846f5db3f489a96145bf5e762aaac2020-11-24T22:15:15ZengMDPI AGPhotonics2304-67322019-07-01638510.3390/photonics6030085photonics6030085Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication SystemsArslan Khalid0Hafiz Muhammad Asif1Konstantin I. Kostromitin2Sattam Al-Otaibi3Kazi Mohammed Saidul Huq4Jonathan Rodriguez5Department of Electrical Engineering, The University of Lahore, Defense Road, Lahore 54000, PakistanCollege of Engineering, Taif University, Ta‘if 26571, Saudi ArabiaDepartment of Physics of Nanoscale Systems, South Ural State University, 76, Lenin Avenue, Chelyabinsk 454080, RussiaCollege of Engineering, Taif University, Ta‘if 26571, Saudi ArabiaDepartment of Mobile Systems, Instituto de Telecomunicacoes, 3810-193 Aveiro, PortugalDepartment of Mobile Systems, Instituto de Telecomunicacoes, 3810-193 Aveiro, PortugalVisible Light Communication (VLC) is a data communication technology that modulates the intensity of the light to transmit the information mostly by means of Light Emitting Diodes (LEDs). The data rate is mainly throttled by the limited bandwidth of the LEDs. To combat, Multi-carrier Code Division Multiple Access (MC-CDMA) is a favorable technique for achieving higher data rates along with reduced Inter-Symbol Interference (ISI) and easy access to multi-users at the cost of slightly reduced compromised spectral efficiency and Multiple Access Interference (MAI). In this article, a multi-user VLC system is designed using a Discrete Wavelet Transform (DWT) that eradicates the use of cyclic prefix due to the good orthogonality and time-frequency localization properties of wavelets. Moreover, the design also comprises suitable signature codes, which are generated by employing double orthogonality depending upon Walsh codes and Wavelet Packets. The proposed multi-user system is simulated in MATLAB software and its overall performance is assessed using line-of-sight (LoS) and non-line-of-sight (NLoS) configurations. Furthermore, two sub-optimum multi-users detection schemes such as zero forcing (ZF) and minimum-mean-square-error (MMSE) are also used at the receiver. The simulated results illustrate that the doubly orthogonal signature waveform-based DWT-MC-CDMA with MMSE detection scheme outperforms the Walsh code-based multi-user system.https://www.mdpi.com/2304-6732/6/3/85visible light communication (VLC)LEDphoto-diode (PD)line-of-sight (LoS)non-line-of-sight (NLoS)multi-carrier code division multiple access (MC-CDMA)discrete wavelet transform (DWT)doubly orthogonal wavelet packets (DOWP)multiple access interference (MAI)minimum-mean-square-error (MMSE) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Arslan Khalid Hafiz Muhammad Asif Konstantin I. Kostromitin Sattam Al-Otaibi Kazi Mohammed Saidul Huq Jonathan Rodriguez |
spellingShingle |
Arslan Khalid Hafiz Muhammad Asif Konstantin I. Kostromitin Sattam Al-Otaibi Kazi Mohammed Saidul Huq Jonathan Rodriguez Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems Photonics visible light communication (VLC) LED photo-diode (PD) line-of-sight (LoS) non-line-of-sight (NLoS) multi-carrier code division multiple access (MC-CDMA) discrete wavelet transform (DWT) doubly orthogonal wavelet packets (DOWP) multiple access interference (MAI) minimum-mean-square-error (MMSE) |
author_facet |
Arslan Khalid Hafiz Muhammad Asif Konstantin I. Kostromitin Sattam Al-Otaibi Kazi Mohammed Saidul Huq Jonathan Rodriguez |
author_sort |
Arslan Khalid |
title |
Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems |
title_short |
Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems |
title_full |
Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems |
title_fullStr |
Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems |
title_full_unstemmed |
Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems |
title_sort |
doubly orthogonal wavelet packets for multi-users indoor visible light communication systems |
publisher |
MDPI AG |
series |
Photonics |
issn |
2304-6732 |
publishDate |
2019-07-01 |
description |
Visible Light Communication (VLC) is a data communication technology that modulates the intensity of the light to transmit the information mostly by means of Light Emitting Diodes (LEDs). The data rate is mainly throttled by the limited bandwidth of the LEDs. To combat, Multi-carrier Code Division Multiple Access (MC-CDMA) is a favorable technique for achieving higher data rates along with reduced Inter-Symbol Interference (ISI) and easy access to multi-users at the cost of slightly reduced compromised spectral efficiency and Multiple Access Interference (MAI). In this article, a multi-user VLC system is designed using a Discrete Wavelet Transform (DWT) that eradicates the use of cyclic prefix due to the good orthogonality and time-frequency localization properties of wavelets. Moreover, the design also comprises suitable signature codes, which are generated by employing double orthogonality depending upon Walsh codes and Wavelet Packets. The proposed multi-user system is simulated in MATLAB software and its overall performance is assessed using line-of-sight (LoS) and non-line-of-sight (NLoS) configurations. Furthermore, two sub-optimum multi-users detection schemes such as zero forcing (ZF) and minimum-mean-square-error (MMSE) are also used at the receiver. The simulated results illustrate that the doubly orthogonal signature waveform-based DWT-MC-CDMA with MMSE detection scheme outperforms the Walsh code-based multi-user system. |
topic |
visible light communication (VLC) LED photo-diode (PD) line-of-sight (LoS) non-line-of-sight (NLoS) multi-carrier code division multiple access (MC-CDMA) discrete wavelet transform (DWT) doubly orthogonal wavelet packets (DOWP) multiple access interference (MAI) minimum-mean-square-error (MMSE) |
url |
https://www.mdpi.com/2304-6732/6/3/85 |
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