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Coding and decoding method for enhancing visible light signal transmission rate, mobile terminal and system

A technology of signal transmission and encoding method, applied in the field of mobile terminals, can solve the problems of LED on, off, on duration, the duration of off can not be accurately controlled, the amount of information is small, the flashing speed of the flash is slow, etc.

Active Publication Date: 2016-04-06
KUANG CHI INTELLIGENT PHOTONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in this way. One is that the flashing speed of the flash is relatively slow, resulting in a low transmission rate. The second is that when controlling the on and off of the LED flash, there will be random delays, that is, the on, off, and on of the LED. The duration and off duration cannot be precisely controlled, showing a certain degree of instability
For example, the patent CN102693567 provides a codec method and applies it to the access control system. This method has the problem that the amount of information transmitted per second is small, and because the control accuracy of the LED is high, so There is also the problem of instability

Method used

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  • Coding and decoding method for enhancing visible light signal transmission rate, mobile terminal and system
  • Coding and decoding method for enhancing visible light signal transmission rate, mobile terminal and system
  • Coding and decoding method for enhancing visible light signal transmission rate, mobile terminal and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment shows a method for encoding and decoding visible light signals, which can increase the transmission rate of visible light signals. The method includes:

[0051] The mobile terminal encodes the obtained N-bit binary digital signal in the following manner:

[0052] Every time a symbol 0 (hereinafter referred to as 0) or symbol 1 (hereinafter referred to as 1) is read, the level jumps once, and the level lasts for T0 to represent 0, and the level lasts for T1 to represent 1, T0T1; the coded signal is modulated into a visible light signal, so that the level jump becomes a change of the presence or absence of the light signal, and the presence or absence of the light signal is continuously Time length T0, T1 to represent 0 or 1. The advantage of this encoding method is that the synchronization signal is represented by a level jump, and 0 or 1 is represented by the duration of the level. In this way, each duration can be used to represent a signal, and the co...

Embodiment 2

[0074] Embodiment two: (segmentation coding and abbreviation with multi-ary system, N-ary system just uses N kinds of waveforms)

[0075] In this embodiment, the binary digital signal to be sent is recoded according to the ternary system for every three-digit binary number, and every 2 enters 1 (code element 2 is called for short 2), as shown in Table 1:

[0076] Table 1 Correspondence table of decimal, binary and ternary numbers

[0077] decimal

binary

Trinary

0

000

00

1

001

01

2

010

10

3

011

02

4

100

11

5

101

12

6

110

20

7

111

21

[0078] The encoding and decoding method of the visible light signal in this embodiment is similar to the first embodiment, the difference is that the signal to be encoded is composed of two code elements 0 and 1 of the binary digital signal instead of the ternary symbol of the ternary digital signal. Corres...

Embodiment 3

[0083] Embodiment three: (reversal: under specified circumstances, the symbol with long sending time and the symbol with short sending time are exchanged)

[0084] The encoding and decoding method of the visible light signal in this embodiment is similar to Embodiments 1 and 2, the difference is that in this example, if the number of symbols with a long unit transmission time is greater than the number of symbols with the shortest unit transmission time number of elements, and the symbol with the longest unit transmission time is the symbol with the longest total transmission time, the symbol with the longest total transmission time is swapped with the symbol with the shortest unit transmission time; and the swap flag is used for identification .

[0085] For example, for the ternary situation in Embodiment 2, we can set the following flip strategy: if the number of 1s is greater than the number of 0s, and the number of 0s is greater than the number of 2s multiplied by the ave...

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Abstract

The invention discloses a coding and decoding method for enhancing visible light signal transmission rate, a mobile terminal and a receiving end adopting the method and a system. The coding method comprises the steps that mobile terminal coding is performed: code elements in data strings are read, level jumps when one code element is read, and different digits of code elements are coded into level signals with different level duration; and light signal modulation and emission are performed: light source modulation of the coded data is performed, and the data are emitted out in the mode of visible light. The receiving end can compare all the read high and low level duration with judgment duration according to the set judgment duration in decoding so that signal decoding is realized.

Description

technical field [0001] The invention relates to a coding and decoding method for increasing the transmission rate of visible light signals, in particular to a coding and decoding method for optical signals sent by LED flashlights of mobile terminals such as mobile phones, a mobile terminal, and a communication system. Background technique [0002] Visible light communication modulates the light emitted by visible light sources through modulation methods such as amplitude, frequency, and phase. LED is a common visible light source, and its transmission rate is as high as several megabytes to tens of megabytes per second. Visible light communication can be applied to wireless optical communication for data transmission. Compared with microwave technology, visible light communication has quite rich spectrum resources, which is unmatched by general microwave communication and wireless communication. At the same time, visible light communication can be applied to almost any comm...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/516
Inventor 不公告发明人
Owner KUANG CHI INTELLIGENT PHOTONIC TECH
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