Multi-path channel modeling method of indoor single light source visible light communication system

A technology for visible light communication and channel modeling, which is applied in the field of indoor visible light communication multipath channel modeling, and can solve problems such as multipath channel modeling that have not been studied

Inactive Publication Date: 2017-11-07
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0021] (1) References [1-10] are all aimed at the single-send-single-receive communication system, calculating the time-domain impulse response between sending and receiving, but they do not study the problem of multipath channel modeling;

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  • Multi-path channel modeling method of indoor single light source visible light communication system
  • Multi-path channel modeling method of indoor single light source visible light communication system
  • Multi-path channel modeling method of indoor single light source visible light communication system

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Embodiment Construction

[0044] The present invention is an indoor single light source visible light communication system multipath channel modeling method, the steps of which are as follows:

[0045] Step 1: Given a typical room, establish a coordinate system in the three-dimensional direction of the room, divide the indoor reflective wall into rectangular micro-reflective units, and specify the position and characteristic parameters of the LED and photodetector (PD);

[0046] Step 2: The LED satisfies Lambertian radiation, and calculates the line-of-sight (LOS) time-domain impulse response between the LED and the PD;

[0047] Step 3: Consider the micro-reflection unit as a reflector that satisfies Lambertian radiation, and use an iterative method to calculate the time-domain impulse response of the reflection path of the optical signal to the PD after any number of reflections;

[0048] Step 4: Sort all time-domain impulse responses in ascending order of time delay, and sum the impulse responses wit...

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Abstract

The invention relates to a multi-path channel modeling method of an indoor single light source visible light communication system. In view of a small angle of view of an actual photoelectric detector (PD), the invention provides the multi-path channel modeling method according to an LED modulation symbol period. The method comprises a first step of giving a size of an indoor communication room, and characteristics of an LED and a PD, and calculating, by using an iteration method, time domain impulse responses of line of sight and multiple reflection signals between the LED and the PD in the single light source visible light communication system; a second step of determining a starting time point of multi-path channel modeling; a third step of giving a definition of inter-code interference, and determining a symbol sampling period of a receiving terminal; a fourth step of using a sum of impulse responses between sampling intervals as a gain of each path of the multi-path channel; and a fifth step of relative to the starting time point of modeling, dividing the sampling period by time delay of a finally received optical signal, and rounding up to an integer of a result of the previous division operation so as to be used as a total number of paths of the multi-path channel.

Description

technical field [0001] The invention relates to indoor visible light communication multipath channel modeling, in particular to multipath channel modeling of a visible light communication system when there is a single indoor light source. Background technique [0002] Since the birth of mobile communication in the early 1980s, it has undergone a symbolic generation of technological innovation about every 10 years, and the fourth generation of mobile communication has been generally put into commercial use so far. However, with the integration of various industries and mobile communications, especially the development of the mobile Internet and the Internet of Things, new challenges have been brought to mobile communications technology. By 2020, the fifth generation (5G) wireless communications, communication rate (Peak rate) will increase by 10 times, and the global mobile data traffic will reach 500-1000 times that in 2010. Usually, the methods for increasing the capacity ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B17/391
Inventor 贾科军靳斌张守琴
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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