LED visible light communication system and light receiving antenna

Abstract

The invention relates to an LED visible light communication system and a light receiving antenna. The light receiving antenna comprises a converging and reflecting unit with converging and reflecting functions and a photoelectric detector arranged at a focal point of the converging and reflecting unit, wherein the converging and reflecting unit is used for converging light signals which are transmitted by an LED light source and carry communication information at the focal point, so that the photoelectric detector receives and analyzes the light signals and recovers the communication information. The light receiving antenna has the beneficial effects that convergence and reception of the light signals are achieved by the light receiving antenna, thus recovering the communication information carried in the light signals transmitted by the LED light source and achieving LED visible light communication; the reflective mirror with the reflecting surface being a paraboloid is adopted as the converging and reflecting unit, thus being capable of easily expanding the light receiving area, achieving large-range light receiving, being beneficial to detection of dim light, improving the sensitivity, avoiding impact of surrounding stray light and ensuring good anti-jamming effect; and a Fresnel prism is adopted to achieve reflection and convergence of light and convergence of reflective light with the help of a reflecting plate, thus reducing the volume of the receiving antenna.

Description

technical field [0001] The present invention relates to optical communication technology, more specifically, to an LED visible light communication system and a light receiving antenna. Background technique [0002] Visible light LED has excellent characteristics such as high brightness, high reliability, low energy loss and long life, and can be used for display, lighting, traffic signal indication, etc. While visible light LED is used for lighting, it has many advantages as a signal light source to realize wireless communication. [0003] The light-receiving antenna is one of the key problems to be solved in the visible light LED wireless communication system, which is usually composed of a convex lens and a photodetector placed at the focal point. The light-receiving antenna with a simple structure can have high light-receiving efficiency when the signal light is vertically incident, but when the signal light is obliquely incident, the signal light will be defocused and o...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an LED visible light communication system and a light receiving antenna for the defects of the prior art such as limited size, high price, and poor light receiving performance.

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