Method and device for automatically adjusting clock in visible light communication system

A technology for visible light communication and communication devices, applied in optical transmission systems, transmission systems, synchronization devices, etc., can solve problems such as rising costs, inconsistent keys, and difficulty in synchronization, and achieve the effect of correct decryption

Active Publication Date: 2015-02-11
KUANG CHI INTELLIGENT PHOTONIC TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At this time, the key used by the receiving end to decrypt the visible light signal is inconsistent with the key used by the transmitting end to encrypt, resulting in the receiving end being unable to decrypt correctly
In addition, in the access control system, there are multiple transmitters corresponding to one receiver, and the synchronization problem will become more difficult, and the use of higher-precision crystal oscillator components will increase the cost

Method used

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  • Method and device for automatically adjusting clock in visible light communication system
  • Method and device for automatically adjusting clock in visible light communication system
  • Method and device for automatically adjusting clock in visible light communication system

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the drawings and specific embodiments are only exemplary, and should not be construed as limiting the protection scope of the present invention.

[0032] figure 1 A visible light communication system 100 in which the present invention may be implemented is shown. The visible light communication system 100 includes a transmitting end 110 and a receiving end 120 . The transmitting end 110 includes an encoder 111 and a pseudocode signal generator 112 coupled to the encoder 111 . The encoder 111 receives the original communication data, and uses the pseudo-code signal generated by the pseudo-code signal generator 112 to encode the original communication data to generate a scrambled signal. Since the generated scrambled signal is different from the original communication data, it plays the...

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Abstract

The invention provides a method for automatically adjusting a clock in a visible light communication system. The visible light communication system comprises a receiving end and at least one transmitting end. The method comprises the following steps: receiving a visible light signal from a first transmitting end among the at least one transmitting end; determining the clock change parameter of the first transmitting end and the clock change parameter of the receiving end according to the visible light signal from the first transmitting end; determining the clock speed factor of the first transmitting end according to the clock change parameter of the first transmitting end and the clock change parameter of the receiving end; and updating clock information of the first transmitting end locally stored by the receiving end at a preset time interval according to the clock speed factor of the first transmitting end.

Description

technical field [0001] The invention relates to a visible light communication system, in particular to automatically adjusting a clock in the visible light communication system. Background technique [0002] Visible light communication technology is a new type of wireless optical communication technology developed on the basis of LED technology. Communication is carried out by flickering at a high frequency of the LED light source. The light represents 1, and the absence of light represents 0. The transmission rate of visible light communication is up to gigabits per second. Visible light communication has quite rich spectrum resources, which is unmatched by general wireless communication including microwave communication. At the same time, visible light communication can be applied to any communication protocol and any environment, and the installation of visible light communication equipment is flexible, convenient, and low-cost, suitable for large-scale popular applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/027H04B10/85
Inventor 不公告发明人
Owner KUANG CHI INTELLIGENT PHOTONIC TECH
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