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The advantages of visible light communication systems built with LEDs are obvious?

Posted on: 02/23/2022

Some time ago, a paper published in “electronics” attracted widespread attention. The researchers used experiments to demonstrate the modulation scheme of a full-duplex LED-to-LED VLC visible light communication system using LEDs as transmitters and receivers. The comparison of performances such as reliability and bit error rate shows that VLC has obvious advantages over traditional radio frequency wireless communication.

Some time ago, a paper published in “electronics” attracted widespread attention. The researchers used experiments to demonstrate the modulation scheme of a full-duplex LED-to-LED VLC visible light communication system using LEDs as transmitters and receivers. The comparison of performances such as reliability and bit error rate shows that VLC has obvious advantages over traditional radio frequency wireless communication.

Visible light communication (VLC), also known as nm wave communication, is a communication technology that uses the visible light spectrum of 380-740 nm as an information carrier. And LEDs are more suitable for wireless communication than other visible light sources due to their high efficiency, long life and fast response.

Compared with traditional radio frequency (RF) wireless communication, VLC has the following advantages:

◆VLC has an unlicensed bandwidth of about 400THz and abundant spectrum resources.
◆VLC is easy to implement, just add a microcontroller to build a network with existing LED devices.
◆VLC uses visible light as the carrier, which will not cause electromagnetic interference to other Electronic equipment.
◆VLC link can easily set up high-speed communication link above 10Gb/s.

Therefore, research on VLC has been carried out extensively, including the development of the IEEE 802.15.7 VLC standard. In this experiment, the researchers summarize the LED-to-LED VLC’s performance dependence on the transmitter and receiver LED wavelengths by measuring the rise time and signal-to-noise ratio (SNR) of the transmitter and receiver LED colors.

In previous studies, On-Off Keying (OOK) is the simplest and most traditional modulation method in optical communication, which has the advantages of low complexity and sufficient bandwidth. Pulse position modulation (PPM) is proposed in the IEEE 802.15.7 VLC standard to support dimming, PPM is another modulation scheme that can achieve higher power efficiency than OOK. However, PPM requires more complex systems and bandwidth consumption.

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme that exhibits high frequency efficiency and can also transmit data through high-frequency sub-carriers, making the system highly sensitive to low-frequency ambient light from other lighting sources. robustness. To overcome the disadvantages of low data rate and susceptibility to other illumination sources in LED-to-LED VLC, the researchers applied quadrature amplitude modulation ( QAM) and Direct Current Biased Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) modulation schemes.

In addition, the researchers analyzed distortion and signal loss in a full-duplex LED-to-LED VLC system. In the full-duplex LED-to-LED VLC system, a 32-QAM DCO-OFDM modulation and reverse bias Circuit are used to achieve a maximum data rate of 49 kbps with a bit error rate

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