WDM for multi‐user indoor VLC systems with SCM

Younus, Safwan Hafeedh; Al‐Hameed, Aubida A.; Hussein, Ahmed Taha; Alresheedi, Mohammed T.; Elmirghani, Jaafar M. H.

doi:10.1049/iet-com.2018.5664

Cited by 7 publications

(6 citation statements)

References 31 publications

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“…The functions of these control signals are: (1) to identify (label) each Tx, (2) to assign the best Tx for each user and (3) to find the interference level that is introduced from interfering Txs. Control signals have proposed widely for many applications in VLC systems 13‐16 . In, 13 control signals were used with non‐orthogonal multiple access (NOMA) to obtain bidirectional connection in indoor VLC system.…”

Section: Introductionmentioning

confidence: 99%

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Interference mitigation in multiuserWDM VLCsystems using differential receiver

Younus

2022

Trans Emerging Tel Tech

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To eliminate the interference between wavelength division multiplexing (WDM) channels in multiuser visible light communication systems, we proposed a differential detection. Four colors laser diodes are utilized as transmitters (Txs).Three colors (channels) are used to send the data and one color is used to convey a control signal in each Tx. The control signal is applied to find the best Tx for each user and to find the level of interference of each WDM data channel.The optical receiver has six photodetectors (PDs). Three PDs receive the data and three PDs receiver control signals. Each optical receiver has three differential amplifiers. The input of each differential amplifier is the difference between the output of two PDs (one PD captures the data and interfering signals and one PD captures control signals). Thus, the amount of the interference that is calculated by the control signals of each color will be removed from each WDM data signal by the differential amplifier. Six users are assumed in our proposed system and each user is allocated one Tx. In this work, reflections up to the third order and mobility of the user are considered while using a simple wide field of view receiver.

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Section: Introductionmentioning

confidence: 99%

“…In, 13 control signals were used with non‐orthogonal multiple access (NOMA) to obtain bidirectional connection in indoor VLC system. Reference 14 used control signals in multiuser VLC system to localize the best Tx for each user. In, 15 control signals were proposed to manage the handover in VLC systems.…”

Section: Introductionmentioning

confidence: 99%

Interference mitigation in multiuserWDM VLCsystems using differential receiver

Younus

2022

Trans Emerging Tel Tech

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“…It should be noted that the bandwidth of the transmitters is low due to using light emitting diodes (LEDs), which have low bandwidth. However, laser diodes (LDs) have been suggested for indoor VLC systems instead of LEDs to enhance the bandwidth of the transmitters 1‐3 . In addition, the bandwidth of the PD can be enhanced by reducing its area as the bandwidth of the PD is proportional to its area 4 .…”

Section: Introductionmentioning

confidence: 99%

“…In Reference 24, tone signals were utilized to obtain parallel data indoor VLC systems. In Reference 3, tone signals were proposed to obtain high data rates multiuser indoor VLC systems. In this article, tone signals were utilized to classify each AP, to assign a group of APs for each UE, to apply the DAT and to apply the PAT.…”

Section: Introductionmentioning

confidence: 99%

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Younus

2021

Trans Emerging Tel Tech

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The main encounters face visible light communication (VLC) systems to provide high data rates for multiuser scenario are intersymbol interference (ISI) and cochannel interference (CCI). This work proposes delay adaptation technique (DAT) in conjunction with power adaptation technique (PAT) to improve the performance of the multiuser indoor VLC systems. The DAT is used to reduce the ISI while the PAT is utilized to reduce the CCI. To apply the DAT and PAT, each access point (AP) requires to share its information with the controller, which is responsible to manage the connection between user equipment (UEs) and APs. Therefore, each AP is given a control signal (an unmodulated unique tone signal). These control signals are utilized to set‐up the connection between APs and UEs (allocate each UE its best APs, which are APs that offer good connection links). Our proposed system performance is evaluated in a realistic room while considering the effect of diffuse reflections and CCI and using on‐off‐keying modulation. The results reveal that a remarkable improvement in the VLC system's performance with using DAT and PAD compared with the VLC system without using DAT and PAT.

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“…In this paper, we proposed a novel handover scheme for indoor VLC systems using subcarrier multiplexing (SCM) tones as control signals. Control tone signals have been used in VLC systems to manage the communication between transmitters and receivers [9][10][11]. Each VLC-AP is given a unique SCM tone, which added to the data signal.…”

Section: Introductionmentioning

confidence: 99%

Novel handover scheme for indoor VLC systems

2021

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Managing mobility in visible light communication systems is one of the main encounters that requires to be tackled. In this paper, we propose subcarrier multiplexing tones as control signals for handover in visible light communication systems. These control tone signals are unmodulated signals, and each light unit is given a unique unmodulated control signal. One light unit is used to send the data to the user, which is the best light unit. At a receiver side, band pass filters are used to separate subcarrier multiplexing tones. This enables receiver to connect with all light units via subcarrier multiplexing tones. The carrier to noise ratio of each control tone signal is estimated at the receiver, which leads to make the receiver connects with the light unit that offers the best connection during its mobility.

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WDM for multi‐user indoor VLC systems with SCM

Cited by 7 publications

References 31 publications

Interference mitigation in multiuserWDM VLCsystems using differential receiver

Interference mitigation in multiuserWDM VLCsystems using differential receiver

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Novel handover scheme for indoor VLC systems

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