Mitigation of Optical Background Noise in Light-Emitting Diode (LED) Optical Wireless Communication Systems

Chow, Chi‐Wai; Yeh, Chien Hung; Liu, Y. F.; Huang, P. Y.

doi:10.1109/jphot.2013.2238618

Cited by 77 publications

(32 citation statements)

References 9 publications

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“…This is due to a purely optical power fluctuation in the transmission path due to scintillation of the refractive index of the channel (Mie/Rayleigh scattering, absorption and particle interactions with the optical beam, etc.) which could not be controlled by the steering system, but data coding and/or suitable modulation techniques developed for modern digital communication system can be used to solve it significantly [2,4,10,13,14,23,24]. However, this is the matter of separate research and out of the scope of this paper.…”

Section: Behavioral Study Of Scintillation and Communication Signal Qmentioning

confidence: 97%

“…A serial pseudorandom binary sequence (PRBS) generator circuit of 2 10 -1 is developed in the FPGA, and its bit stream output is given to the optical modulator at the asynchronous transfer mode (ATM) rate of 155 Mbps. A widely used UNRZ-OOK-IM-DD scheme, with a UNRZ signal of 0 V (low) for logic '0' and 3.3 V (high) for logic '1' , is used to directly modulate the optical signal [4,7,9,10,23]. The modulated light is made to fall on the optical shaker and gets reflected towards the transmitting optics.…”

Section: Fsoc Experimental Test-bed Configuration and Control Strategmentioning

confidence: 99%

“…A new design approach is introduced in this paper for the hardware implementation of a neural controller in a field-programmable gate array (FPGA) to operate the beam ATP process at a faster rate and also in parallel. The unipolar non-return to zero on-off keying-intensity modulation-direct detection (UNRZ-OOK-IM-DD) scheme is used for data transmission [23,24]. In order to intensively evaluate the performance improvement of FSOC due to the beam ATP control system, the time series plot of beam centroid displacement (wandering) on a 2D optoelectronic position detector (OPD) plane received signal power fluctuation and the demodulated data are continuously recorded and used to carry out on/off line analysis and compute various communication parameters.…”

Section: Introductionmentioning

confidence: 99%

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Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

Raj¹,

Selvi

Durai

et al. 2014

J Wireless Com Network

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Over the last two decades, free-space optical communication (FSOC) has become more and more interesting as an adjacent and/or alternative to radio frequency (RF) and optical fiber communications. The optical wave propagation in the FSOC channel is severely affected by atmospheric parameters, and it leads to the degradation of the data transmission quality and reliability. Among the various atmospheric effects, the beam wandering is the main cause of major power loss and cannot be solved without the incorporation of the beam centroid stabilization system. Therefore, designing a suitable opto-electronic assembly with a beam wandering mitigation system becomes significant to improve the performance of the FSOC system. A FSOC experimental setup is developed for the link range of 0.5 km in the college campus. A neural controller is designed for beam wandering mitigation. The neural controller processed the beam pointing (beam location) information obtained from an opto-electronic position detector (OPD) and then generated the necessary control outputs to the fast steering mirror (FSM) to steer the beam in the counter-direction to mitigate the beam wander at the receiver station. New design approach and architecture development for the implementation of the designed neural controller in the field-programmable gate array (FPGA) to mitigate the beam wandering are presented. The investigations on the performance of the neural controller in aiming a laser beam to be at a particular point on the detector plane are tested under dynamic disturbances generated at the transmitter in addition to the atmospheric effects through which the maximum correction capability of the developed neural controller is examined. Evidence of the suitability and the effectiveness of the proposed neural controller is evaluated in terms of beam centroid displacement, power spectral density (PSD), radial displacement on a 2D plane, effective scintillation index (ESI), Q-factor, and bit error rate (BER). The beam wandering range of −0.13 to +0.16 mm, maximum of 55 dB disturbance band attenuation with a frequency range of 0 Hz through 2 kHz, ESI of 0 to 0.15, Q-factor of 6, and BER of 6.45 × 10 −9 are achieved due to the incorporation of the developed neural controller in different real-world environmental conditions.

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Section: Behavioral Study Of Scintillation and Communication Signal Qmentioning

confidence: 97%

Section: Fsoc Experimental Test-bed Configuration and Control Strategmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

Raj¹,

Selvi

Durai

et al. 2014

J Wireless Com Network

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“…They applied simple NRZ data while keeping the lighting fixed. In [13], the authors have used Manchester coding to discuss the experimental results for the LED to reduce optical noise. They have not used any adaptive monitoring, feedback or optical filtering.…”

Section: Introductionmentioning

confidence: 99%

LED Based Optical Wireless Communication System for WBAN

Baqai

Umrani

Chowdhry

2016

Mehran Univ. res. j. eng. technol.

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“…Various studies have been conducted with the aim of reducing the effect of background noise in an OWC [14], [15]. In this paper, we propose a turbo-coded differential OOK (DOOK) system to deal with the effect of optical background noise in optical wireless IM/DD communication.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

Rai

Kozawa

Habuchi

et al. 2015

Journal of Signal Processing

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In this paper, turbo-coded on-off keying (OOK) with differential detection is proposed. The proposed system constitutes the standard turbo code with OOK modulation, differential encoding and a delay detection technique. The purpose of using the differential encoding system is to suppress the influence of background noise in an optical wireless channel (OWC). OOK systems use the threshold detection method to determine the data. In optical intensity modulation/direct detection (IM/DD) systems, disturbances in the channel such as background noise and scintillation make it more difficult to decide the threshold value. Hence, in order to deal with the degradation in the quality of communication due to background noise, a turbo-coded OOK system with differential encoding and delay detection is proposed. The bit error rate (BER) performance of the proposed system is analyzed through computer simulation of an OWC in the presence of background noise, scintillation and avalanche photodiode (APD) noise. In terms of the BER performance, the results of this study show that the proposed system outperforms the conventional turbo-coded OOK system by 2.0 [dBm] at BER=10 −5 .

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Mitigation of Optical Background Noise in Light-Emitting Diode (LED) Optical Wireless Communication Systems

Cited by 77 publications

References 9 publications

Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

Intensity feedback-based beam wandering mitigation in free-space optical communication using neural control technique

LED Based Optical Wireless Communication System for WBAN

Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

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