Wireless communication receiver of visible light of an LED traffic light, receiving method and application method

Abstract

The invention discloses a wireless communication receiver of visible light of an LED traffic light, a receiving method and an application method. A receiver adopting a green light filter lens and a red light filter lens is horizontally positioned at a place of the top of a vehicle, in which vertical inclination angles are the same. The emitted visible light is focused to a light detector. A code element signal is modulated and loaded to the LED traffic light, and the visible light emitted by the LED traffic light, is converted into an electric signal through the light detector and a signal amplification module. Signal current resulting from the conversion of the red light or the green light is restored by a balance and judgment module into an original code element signal. The restored code element signal is subject to diversity combination and then output through a diversity combining algorithm module. By optionally receiving the wavelength of the visible light, the invention achieves high signal noise ratio. A similarity comparison combination method is adopted to screen a branch with high error code rate so that the error code rate of the system is reduced to 10<-6>. The adoption of the diversity combination method effectively improves the communication quality, increases the distance of reliable communication and leads to strong communication capability and wide communication coverage.

Description

technical field [0001] The invention belongs to the field of noise or interference suppression, and relates to an outdoor visible light wireless communication system, in particular to a receiver for visible light wireless communication of LED traffic lights, an anti-fading receiving method of the receiver, and an application of the receiver. Background technique [0002] In recent years, the semiconductor (LED) lighting technology known as "green lighting" has developed rapidly. Due to the multiple benefits of LED traffic lights such as energy saving, good reliability and high visibility during the day and in bad weather conditions. It has become a trend to make traffic lights with LEDs. Utilizing the outstanding advantages of high response sensitivity and good modulation performance of LEDs, a visible light wireless communication system for LED traffic lights can be realized. At present, the receiver of the outdoor visible light communication system adopts the method of d...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the influence of optical radiation transmission and outdoor background light noise interference, the received optical signal fluctuates greatly and fades greatly, and the ability to suppress noise is poor, which affects signal communication quality and transmission distance, etc.

[0004] 2. The bit error rate of the signal after optical detection filtering is high, which limits the communication distance

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