Visible light channel estimation method and system

A channel estimation and visible light technology, which is applied in the field of visible light, can solve problems such as the inability to accurately obtain visible light channel estimates, and achieve accurate estimation.

Active Publication Date: 2016-04-06
SYSU CMU SHUNDE INT JOINT RES INST +1
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a visible light signal estimation method and system that can accurately obtain visible light channel estimates for the problem that general channel estimation algorithms cannot accurately obtain visible light channel estimates

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Visible light channel estimation method and system
  • Visible light channel estimation method and system
  • Visible light channel estimation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] like figure 1 , figure 2 As shown, a visible light channel estimation method includes steps:

[0028] S100: Obtain a corresponding pilot signal in the visible light channel, perform least squares estimation on the channel transfer function corresponding to the pilot signal, and perform maximum likelihood estimation on the time-domain channel impulse response of the spatial position where the pilot signal is received, Obtain maximum likelihood estimates of the time-domain channel impulse response at different locations in the visible light channel.

[0029] Least Square (LS) is a mathematical optimization technique. It finds the best function fit to the data by minimizing the sum of squared errors. The unknown data can be easily obtained by using the least square method, and the sum of squares of the errors between the obtained data and the actual data can be minimized. Least squares can also be used for curve fitting. Maximum Likelihood Estimation (MaximumLikeliho...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a visible light channel estimation method and system. The method comprises the following steps: performing least square estimation on a channel transfer function corresponding to a pilot signal, and performing maximum likelihood estimation on time domain channel impulse response of a spatial position which receives the pilot signal so as to acquire the maximum likelihood estimation of the time domain channel impulse response at different positions in the visible light channel, computing a covariance coefficient of each tapping in the visible light channel under same moment and different time delays, self-adaptively selecting an optimal variable statistic window length, and then computing a time domain estimation value of each tapping as a mean value required by Bayes estimation, and acquiring the time domain Bayes estimation of the channel impulse response. In the whole process, the length of an optimal statistic window is self-adaptively determined according to the covariance coefficient of each tapping, the parameter required by the Bayes estimation is computed, thereby providing a complete and precise channel estimation parameter for a visible light communication system, and realizing the accurate estimation of the visible light channel.

Description

technical field [0001] The present invention relates to the field of visible light technology, in particular to a visible light channel estimation method and system. Background technique [0002] In recent years, the emergence of Visible Light Communications (VLC) technology has become an important supplement to traditional wireless communication systems, injecting new and powerful impetus into the evolution of next-generation wireless communication systems and networks. [0003] A traditional radio frequency (Radio Frequency, RF) based wireless communication system generally adopts a pilot-based channel estimation scheme (Pilot-Aided Channel Estimation, PACE) in actual deployment. Because this type of scheme is relatively simple to implement, combined with an interpolation algorithm, the channel parameters before adjacent pilots can be easily calculated, so it has been widely used. However, compared with the wireless channel model, the channel impulse response (Channel Imp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04B10/116
CPCH04B10/116H04L25/0212H04L25/024H04L27/2601
Inventor 陈贤煜江明
Owner SYSU CMU SHUNDE INT JOINT RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap