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Method for estimating channel impulse response tap number in visible light communication

A channel impulse response, visible light communication technology, applied in the field of visible light communication, to achieve the effect of low complexity and easy implementation

Active Publication Date: 2017-12-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to this method lies in the determination of the threshold value, which has certain limitations.

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  • Method for estimating channel impulse response tap number in visible light communication
  • Method for estimating channel impulse response tap number in visible light communication
  • Method for estimating channel impulse response tap number in visible light communication

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Experimental program
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Embodiment Construction

[0022] 1. Applicable environment

[0023] This scheme is applied to the visible light DCO-OFDM system. Required system support: There is an OFDM symbol in the system as a long training sequence, that is, block pilots are used for channel estimation, or lattice pilots can be used to save overhead, and then the frequency response of other sampling points can be calculated using interpolation algorithms . Among them, the power of the block pilot training sequence on each pilot subcarrier is the same to ensure that the performance of channel estimation on each subcarrier is similar; the power of the training sequence on each pilot subcarrier should be the same as that of the data OFDM symbol on each subcarrier same power. CP length N CP be greater than the maximum channel delay N h .

[0024] 2. Technical issues

[0025] The specific steps of the channel estimation algorithm based on DFT transform are as follows: figure 1 As shown, it is divided into 4 steps: estimate the m...

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Abstract

The invention discloses a method for estimating channel impulse response tap number in visible light communication and belongs to the technical field of the visible light communication. According to the estimation method, judgment is carried out based on Mahalanobis distance. The distance is covariance distance. Data correlation is taken into consideration. All points after impulse response cyclic prefix are taken as a noise type. In the cyclic prefix, the front part of the points are selected as an impulse response type, the rest points are to-be-judged points, and which type the to-be-judged points belong to is judged according to the Mahalanobis distance. Through application of the method, the channel impulse response tap number is estimated. Compared with a traditional method of taking the CP (Cyclic Prefix) as impulse response, the method has the advantage that the mean square error performance is improved. Compared with the fact that the impulse response taps are known accurately, the method has the advantages that under a low signal to noise ratio, the performance is improved, and under a high low signal to noise ratio, the performance is equivalent.

Description

technical field [0001] The present invention relates to visible light communication technology, in particular to a method for estimating the number of channel impulse response taps in visible light communication. Background technique [0002] Optical communication is an emerging technology that transmits load information through optical radiation. With its many advantages, it has become one of the research hotspots in the field of wireless communication in recent years. It is the most potential complementary radio frequency technology in future wireless access solutions. technology. OFDM is the basic modulation method for high-speed transmission of visible light communication. Among them, the DCO-OFDM scheme appeared earlier and the research is relatively mature. Therefore, most of the current visible light physical systems are implemented using this scheme. [0003] In the OFDM system, frequency domain equalization is required to combat the impact of ISI, and equalization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 蒋良成程风全蒋文轩陈明
Owner SOUTHEAST UNIV