Abstract
The quality of a received signal is one of the most important factors to be considered when designing a receiver for visible light communication (VLC) systems. Therefore, it is necessary to evaluate the robustness of the VLC receiver circuit in low-signal-to-noise ratio (SNR) communication. The SNR is the quantity characterized by the ratio of the signal power to the noise power of the received signal. The noise generates an offset voltage and distorts the desired signal waveform. Thus, a low SNR makes it difficult to retrieve the data. Among the sources of noise, ambient light has the most negative impact on the VLC data signal. Therefore, the novel receiver proposed by us acts as an ambient light rejection circuit. As our average-voltage tracking circuit is insensitive to the sunlight and indoor fluorescent light, our design could be a solution to enhance the performance of low-SNR VLC systems. Several experiments are conducted using light of same intensity, but with different distances and semi-angles. Experimental results demonstrate that robust interference rejection is possible to send an error-free communication with an On-Off Keying modulation base on microcontroller up to 1 Mbps at an SNR of −2.7 dB.
Highlights
In recent years, visible light communication (VLC) has attracted a lot of interest as a novel technology in short-range wireless communication [1,2,3,4,5]
With PD and complex modulation methods, such as quadrature amplitude modulation (QAM), orthogonal frequency-division multiplexing (OFDM) or a combination of QAM and OFDM, the speed in the VLC system was demonstrated to reach as high as a few tens of gigabits per second [18,19]
Condition, the HFP does not have a good performance. With this motivation in mind, we proposed a novel VLC receiver design to solve the problem
Summary
Visible light communication (VLC) has attracted a lot of interest as a novel technology in short-range wireless communication [1,2,3,4,5]. We must consider VLC in real-time operating systems and variable signal-to-noise ratio (SNR) conditions. The offset voltage is generated by noise and amplified along with the original signal in the data demodulating process. For the OOK modulation with this method, in theory, it requires SNR = 13.6 dB for it to be error-free [9]. Under the low-SNR condition, the HFP does not have a good performance With this motivation in mind, we proposed a novel VLC receiver design to solve the problem.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
