A Calculation Method for Complex Channel Impulse Response of Indoor Visible Light Communication System

Abstract

The invention discloses a computing method for an impulse response of a complex channel of an indoor visible light communication system. The method comprises the following steps of uniformly dividinga radiation area of an LED light source at the level of a solid angle; emitting light at each divided solid angle element; through direction information of the light which is not blocked, computing the size of the solid angle of the radiation area of the light source blocked by an obstacle and estimating a plane coefficient of a plane where the obstacle is located in order to obtain a point cloudmodel of the obstacle; solving a convex hull model of a point cloud of the obstacle by applying a Jarvis stepping method; combining the convex hull of the obstacle with a photon collision model to obtain a moment function for judging whether the light is blocked by the obstacle or not; and combining the moment function with a recursive algorithm for the impulse response of the channel in order toobtain the computing method for the impulse response of the complex indoor visible light channel. According to the method, the estimation of the visible light communication channel is more practical and more accurate.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and specifically relates to a method for calculating the channel impulse response of an indoor visible light communication system by considering the influence of indoor obstacles (furniture, people, etc.) and combining a recursive algorithm and a ray tracing method. Background technique [0002] Visible light communication uses white LEDs as light sources, and uses high-speed bright and dark flashing signals carried by LED lights to transmit information, realizing the role of communication while lighting. And now in the field of wireless communication, electromagnetic wave spectrum resources are increasingly scarce, and people need to expand the next-generation communication spectrum in time, and visible light is a good choice. In addition, visible light communication has strong confidentiality; no electromagnetic radiation, and does not interfere with radio frequency signals;...

AI Technical Summary

Problems solved by technology

Among them, the recursive algorithm and the ray tracing method can effectively calculate the channel impulse response of the system in the empty room, but in the actual scene, there are many obstacles in the indoor channel, which will affect the propagation of light

[0004] The current problem is that the size of the obstacles in the indoor channel is relatively large compared with the indoor space, and the number is small, and the use of the statistical model will produce a large deviation; and the obstacles in the statistical model are often limited to a specific shape, which will cause The estimation of the channel produces a large error

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