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Multipath Fading Channel Modeling Method for Indoor Visible Light MIMO Communication System

A multipath fading channel and communication system technology, which is applied in the field of indoor visible light communication multipath fading channel modeling to achieve the effect of solving asynchronous

Inactive Publication Date: 2018-10-23
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0012] The purpose of the present invention is to establish a multi-input multi-output communication system suitable for indoor visible light, which can combine LED modulation bandwidth and multi-path channel model to solve the problem of multi-path fading channel modeling when there is time dispersion at the sending end , and the calculation method of each path gain of the multipath channel is given

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  • Multipath Fading Channel Modeling Method for Indoor Visible Light MIMO Communication System
  • Multipath Fading Channel Modeling Method for Indoor Visible Light MIMO Communication System

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Embodiment Construction

[0029] The present invention is an indoor visible light MIMO communication system multipath fading channel modeling method, the steps of which are:

[0030] Step 1: Given the size of the indoor communication room and the reflectivity of the wall, the device parameters and location information of the LED and photodetector PD, divide the indoor reflective wall into differential reflective units according to the modeling accuracy requirements;

[0031] Step 2: Assuming that the LED is a Lambertian light source, calculate the impulse response for line-of-sight propagation between each pair of LEDs and PD;

[0032] Step 3: The differential reflection unit is used as the reflector and also as the source of high-order reflection, and the iterative method is used to calculate the impulse response of the reflection path of the optical signal reaching the PD after multiple reflections;

[0033] Step 4: When the LOS channel path length difference between each pair of LEDs and PDs is larg...

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Abstract

The invention discloses a multipath fading channel modeling method of an indoor visible light MIMO communication system, and aims at building a calculation method which is applicable to an indoor visible light MIMO communication system, can combine LED modulation bandwidth with a multipath channel model, can solve a multipath fading channel modeling method when a transmitting end has time dispersivity and provides each path gain of a multipath channel. The multipath fading channel modeling method comprises the steps of (1) calculating time domain pulse response of each pair of an LED and a PD in a VLC-MIMO system by adopting an iteration method; (2) replacing a practical LOS (Light of Sight) channel by using an equivalent LOS channel to realize channel modeling synchronization as time dispersivity exists when a path difference between the LOS channels is great; (3) obtaining a symbol sampling speed of a receiving end based on the modulation bandwidth of the LED, providing definition of inter-symbol interference and accordingly determining an integral time section of each path gain of the multipath channel; and (4) integrating the pulse response in the integral time section of each path gain so as to obtain each path gain of the multichannel.

Description

technical field [0001] The invention relates to indoor visible light communication multipath fading channel modeling, in particular to multipath fading channel modeling of an indoor visible light multiple-input multiple-output communication system. Background technique [0002] Light Emitting Diode (LED) is a new generation of light source in the future, and is recognized as one of the most promising high-tech fields in the 21st century. Visible Light Communication (VLC), which emerged with the development of white LED lighting technology, relies on the high-speed bright and dark flickering light signal intensity emitted by LEDs that cannot be felt by the naked eye to transmit information. Compared with traditional radio frequency (Radio Frequency, RF) communication, VLC can provide a communication bandwidth of more than 400THz for free use, maintain a high optical transmission power without causing health hazards to the human body, and have good communication confidentialit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/391
CPCH04B17/0087H04B17/3911
Inventor 贾科军
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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