scholarly journals Experimental Demonstration of 3 × 3 MIMO LED-to-LED Communication Using RGB Colors

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4921
Author(s):  
Hyunwoo Jung ◽  
Sung-Man Kim
Keyword(s):  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Light Emitting Diode ◽  
Multiple Input Multiple Output ◽  
Visible Light Communication ◽  
Experimental Demonstration ◽  
Free Space Optical ◽  
Single Input Single Output ◽  
Transmission Distance ◽  
Ber Performance

Optical wireless communication (OWC) is one of the promising candidates for beyond fifth-generation communication (B5G). Depending on the type of transmitters, receivers, and information carriers applied in the system, OWC can be categorized into visible light communication, light fidelity, free-space optical communication, optical camera communication, etc. In addition to these OWC subcategories, this paper proposes light-emitting diode (LED)-to-LED communication as another subcategory of OWC technique. Furthermore, we show an experimental demonstration of the multiple-input multiple-output (MIMO) LED-to-LED communication system using red, green, and blue colored LEDs. We believe that LED-to-LED communication is an effective solution to resolve the communication burden arising from massive connectivity in B5G internet of things. Along with the measurement results of the transmitter LED, receiver LED, and the channel properties, it is shown that the MIMO LED-to-LED system is able to successfully recover the transmitted signal with low inter-channel interferences due to the receiver LED’s unique characteristics. Finally, the bit error rate (BER) performance of the MIMO LED-to-LED system is shown in comparison with the BER performance of the single-input single-output (SISO) LED-to-LED system. We successfully implemented the 3 × 3 MIMO LED-to-LED communication system using RGB colors at a data rate of 30.62 kbps over a 10 cm transmission distance along with direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) modulation and zero-forcing (ZF) equalizer.

scholarly journals Study of the Performance of Deep Learning-Based Channel Equalization for Indoor Visible Light Communication Systems

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 453
Author(s):  
Pu Miao ◽  
Weibang Yin ◽  
Hui Peng ◽  
Yu Yao
Keyword(s):  
Deep Learning ◽  
Visible Light ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
Channel Equalization ◽  
Training Data ◽  
Traditional System ◽  
Ber Performance

The inherent impairments of visible light communication (VLC) in terms of nonlinearity of light-emitting diode (LED) and the optical multipath restrict bit error rate (BER) performance. In this paper, a model-driven deep learning (DL) equalization scheme is proposed to deal with the severe channel impairments. By imitating the block-by-block signal processing block in orthogonal frequency division multiplexing (OFDM) communication, the proposed scheme employs two subnets to replace the signal demodulation module in traditional system for learning the channel nonlinearity and the symbol de-mapping relationship from the training data. In addition, the conventional solution and algorithm are also incorporated into the system architecture to accelerate the convergence speed. After an efficient training, the distorted symbols can be implicitly equalized into the binary bits directly. The results demonstrate that the proposed scheme can address the overall channel impairments efficiently and can recover the original symbols with better BER performance. Moreover, it can still work robustly when the system is complicated by serious distortions and interference, which demonstrates the superiority and validity of the proposed scheme in channel equalization.

scholarly journals Free-Space Optical Link Optimization in Visible Light Communication System

2021 ◽  
Author(s):  
Ngene Chidi Emmanuel ◽  
Prabhat Thakur ◽  
Ghanshyam Singh
Keyword(s):  
Visible Light ◽  
Communication System ◽  
Free Space ◽  
Light Emitting Diode ◽  
Software Tool ◽  
Visible Light Communication ◽  
Free Space Optical ◽  
Eye Diagram ◽  
Optical Link ◽  
System Properties

Abstract In this paper, a free-space optical link (FSOL) optimization in the visible light communication (VLC) is performed to improve the channel performance for signal strength and analysze the effect of signal failures in a communication system. The problem of uncertainty in the FSOL components for a better signal has prompted this study to check for an improved and enhance signal using bit error rate (BER) analyzer. The light emitting diode (LED) is used as a carrier for transmission of data as the optimization of system properties have concluded for limitations and working conditions. The noise has been added and removed to ascertain the channel behavior which in turn display an acceptable eye diagram for an improved signal. The acceptable eye diagram shows a better signal in the system. The optimization of FSOL will guarantee multi-mobile users of shared signal which will improve the signal errors, loss of power, weak signal, signal failure, loss of data etc. To fully characterize the FSOL, OptiSystem software tool has been used.

scholarly journals Implementasi Visible Light Communication (VLC) Pada Sistem Komunikasi

2017 ◽  
Vol 1 (1) ◽  
pp. 13
Author(s):  
ARSYAD RAMADHAN DARLIS ◽  
LITA LIDYAWATI ◽  
DECY NATALIANA
Keyword(s):  
Solar Cell ◽  
Visible Light ◽  
Communication System ◽  
Communication Systems ◽  
Light Emitting Diode ◽  
Bright Light ◽  
Visible Light Communication ◽  
Light Emitting ◽  
Transmission Distance ◽  
The Many

ABSTRAKPerkembangan teknologi telah menunjukkan peningkatan yang cukup signifikan, terutama untuk bidang komunikasi. Hal ini terbukti dengan banyaknya media komunikasi baik itu nirkabel dan kabel. Pada penelitian ini dimanfaatkan cahaya tampak sebagai media dalam sistem komunikasi, dimana selama ini cahaya hanya digunakan sebagai penerangan saja. Visible Light Communication (VLC) adalah sebuah teknologi komunikasi yang memanfaatkan pancaran cahaya tampak dari lampu pada sistem komunikasi. Sistem komunikasi visible light ini terdiri dari pemancar dan penerima. Pemancar terdiri dari Light Emitting Dioda, audio transformator dan baterai, dan pada penerima terdiri dari solar cell dan photodioda, amplifier dan catu daya. Hal-hal yang dapat mempengaruhi hasil output sistem komunikasi adalah jarak, terang cahaya lampu pemancar dan cahaya luar. Pada penelitian ini, komunikasi menggunakan VLC dapat dilakukan pada jarak pengiriman data sebesar 2,5 m dan dengan range frekuensi 600 Hz sampai dengan 45 kHz dimana data dapat disalurkan dengan baik.Kata kunci: Visible light, Sistem komunikasi, Light Emitting Dioda, solar cell, photodioda.ABSTRACTTechnological developments have shown a significant increase, especially in the field of communication. This is proved by the many communications media using both wireless and wired. This study utilized the visible light as a medium of communication system, which has been used as an illumination light only. Visible Light Communication (VLC) is a communication technology which utilize visible light emitted from the lamp in the communication system. The visible light communication system consists of a transmitter and receiver. The transmitter consists of a Light Emitting Diode, audio transformer and battery, and the receiver consists of a solar cell and a photodiode, amplifier and power supply. Things that can affect the output of the communication system is the distance, bright light and outdoor light. In the research, the results that obtained from this study is the data transmission distance of 2.5 m and a frequency range of 600 Hz to 45 kHz data can be routed properly.Keywords:  Visible light, Communication systems, Light Emitting Dioda, solar cell, photodioda.

scholarly journals Dimming Techniques for Visible Light Communication System

2018 ◽  
Vol 10 (1) ◽  
pp. 258
Author(s):  
Suriza A.Z. ◽  
Sharmin Akter ◽  
M. Shahnan
Keyword(s):  
Visible Light ◽  
Communication System ◽  
Light Emitting Diode ◽  
New Technology ◽  
Visible Light Communication ◽  
Modulation Method ◽  
Transmission Distance ◽  
Modulation Techniques ◽  
Dimming Control ◽  
Future Work

<p class="thesis-abstract">Visible light communication (VLC) is an emerging and promising new technology in optical wireless communication (OWC). However, dimming has an adverse effect on the performance of visible light communication system. In visible light communication (VLC) system, illumination and communication both are provided simultaneously using a light emitting diode (LED). The specification for lighting is application specific for which dimming control is required. There are different modulation techniques for dimming control in visible light communication. In this thesis, NRZ-OOK modulation method and 4-QAM-OFDM modulation techniques are investigated for different dimming range, transmission distance, beam divergence angle and bit rate. The result shows that for 13m link range, 5Gb/s data speed is achievable for the 4-QAM-OFDM scheme. The analysis of this research is executed only based on system parameters. The scope of this research excluded the following parameters which are shadowing, mobility, multipath interference and inter-symbol interference for multicarrier modulation. These are the related research topic which can be investigated for future work.</p>

scholarly journals Indoor Wavelet OFDM VLC-MIMO System: Performance Evaluation

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 270
Author(s):  
Waleed K. Badawi ◽  
Marwa G. El-Hossary ◽  
Moustafa H. Aly
Keyword(s):  
Frequency Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
Mimo Systems ◽  
Mimo System ◽  
Light Emitting Diode ◽  
Multiple Input Multiple Output ◽  
Visible Light Communication ◽  
Hybrid Space ◽  
Equalization Technique ◽  
Space Frequency

Both light emitting diode (LED) characteristics for illumination and communication simultaneously have made visible light communication-orthogonal frequency division multiplexing (VLC-OFDM) a strong competitive to radio frequency (RF). In this juncture, to improve signal to noise ratio (SNR) and coverage contour, the wavelet-OFDM is suggested for indoor VLC systems. In this paper, a wavelet VLC-OFDM is proposed for imaging multiple-input multiple-output (MIMO) systems. The proposed wavelet-OFDM is exploited for a hybrid space-frequency domain pre-equalization technique instead of the traditional fast Fourier transform (FFT)-OFDM technique. The Meyer filter is selected and employed in the proposed technique. A comparable achievement is elaborated for several numbers of channels to achieve the enhanced performance in terms of bit rate and coverage contour. In addition, a useful comparison is executed between our wavelet VLC-OFDM and the traditional FFT-OFDM for a hybrid space-frequency domain pre-equalization technique. The simulation results emphasize the superiority point of wavelet VLC-OFDM MIMO system by improving the coverage contour by ~20% over the traditional OFDM at a 10−3 bit error rate (BER) target. Hence, the proposed technique can be potentially executed in indoor VLC-MIMO systems.

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