Multi-band transmission color filters for multi-color white LEDs based visible light communication

2017 ◽  
Vol 403 ◽  
pp. 330-334 ◽  
Author(s):  
Qixia Wang ◽  
Zhendong Zhu ◽  
Huarong Gu ◽  
Mengzhu Chen ◽  
Qiaofeng Tan
Keyword(s):  
Visible Light ◽  
Visible Light Communication ◽  
White Leds ◽  
Color Filters ◽  
Multi Band

scholarly journals Color Filter Identification for Bidirectional Visible Light Communication

2018 ◽  
Vol 6 (2) ◽  
pp. 303
Author(s):  
ARSYAD RAMADHAN DARLIS ◽  
LITA LIDYAWATI ◽  
LUCIA JAMBOLA
Keyword(s):  
Visible Light ◽  
Communication Systems ◽  
Audio Signal ◽  
Visible Light Communication ◽  
Maximum Distance ◽  
Color Filter ◽  
Audio Frequency ◽  
Color Filters

ABSTRAKSaat ini, cahaya tampak dimanfaatkan oleh manusia hanya sebagai penerangan saja. Akan tetapi, beberapa penelitian telah membuktikan bahwa cahaya tampak dapat dimanfaatkan pula pada sistem komunikasi, yang dinamakan Visible Light Communication (VLC). Pada penelitian ini, sebuah metoda menggunakan color filter diidentifikasi dalam mengimplementasikan sistem bidirectional pada teknologi VLC. Dengan adanya penelitian ini, sebuah sistem bidirectional Visible Light Communication (Bi-VLC) dapat diimplementasikan dengan menggunakan color filter tertentu yang dipasangkan pada posisi uplink dan downlink. Sinyal informasi berupa sinyal audio ditansmisikan melalui VLC transmitter (Tx) yang dipasang color filter dan diterima oleh color filter pada VLC receiver (Rx) setelah melalui media cahaya. Pengujian menunjukan bahwa sistem telah dapat melewatkan sinyal pada frekuensi audio dengan jarak maksimum dari sistem adalah 2,3 m. Sedangkan pasangan color filter yang memiliki kinerja paling baik untuk BI-VLC adalah Azure (Tx) dengan Charteuse Green (Rx), Charteuse Green (Tx) dengan Charteuse Green (Rx), dan Rose (Tx) dengan Charteuse Green (Rx).Kata kunci: Bidirectional, Visible Light Communication (VLC), Color Filter, AudioABSTRACTCurrently, visible light are utilized by humans as illumination only. However, several research have proven that visible light can also be used in communication systems, called Visible Light Communication (VLC). In this research, a method of using color filters was identified for bidirectional systems on VLC technology. With this research, a bidirectional Visible Light Communication (Bi-VLC) system can be implemented using a specific color filter paired in uplink and downlink mode. The audio signal as information is transmitted through a VLC transmitter (Tx) installed by a color filter and received by the color filter on the VLC receiver (Rx) after going through the light media. The result shows that the system has been able to pass the signal at the audio frequency with the maximum distance of the system is 2.3 m. While the best performance of color filter pair for BI-VLC is Azure (Tx) with Charteuse Green (Rx), Charteuse Green (Tx) with Charteuse Green (Rx), and Rose (Tx) with Charteuse Green (Rx).Keywords: Bidirectional, Visible Light Communication (VLC), Color Filter, Audio

scholarly journals Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2537
Author(s):  
Luis Rodrigues ◽  
Mónica Figueiredo ◽  
Luis Nero Alves
Keyword(s):  
Internet Of Things ◽  
Visible Light ◽  
Pulse Shaping ◽  
Matched Filter ◽  
Low Cost ◽  
Visible Light Communication ◽  
Analog Filters ◽  
Shaping Filter ◽  
Butterworth Filters ◽  
Multi Band

This paper presents a multi-user Visible Light Communication (VLC)-based Internet of Things (IoT) system using multi band-Carrierless Amplitude and Phase (m-CAP) modulation for IoT applications. The proposed system uses a digital m-CAP modulator embedded in a ceiling LED light fixture and analog receivers, aiming at low-cost, low-power, and small-sized IoT devices. The performance was evaluated in terms of the filtering stage design and the usage of guard bands. Different pairs of emitter and receiver filters were considered. While Bessel and Butterworth analog filters were tested in the analog receiver, the digital m-CAP modulator pulse shaping filter considered raised cosine filters, as well as digital matched filters for the analog Bessel and Butterworth filters. Regarding the guard bands, two approaches were considered: either by using the raised cosine roll-off factor (bandwidth compression) or by suppressing the even bands. The Bit Error Rate (BER) performance was obtained by simulation. The usage of the Bessel filter in the receiver, along with a digital matched filter, proved to be the best solution, achieving a BER lower than 10−3 for an Eb/No of 6 dB, using a third-order filter. Furthermore, guard bands should be used in order to mitigate inter-band interference in order to have improved performance when multiple users intend to simultaneously communicate.

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