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Coding method and transmission method of visible light signals
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A technology of encoding method and transmission method, which is applied in the direction of electromagnetic wave transmission system, electrical components, transmission system, etc.
Active Publication Date: 2012-09-26
KUANG CHI INTELLIGENT PHOTONIC TECH
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However, there is no corresponding coding method in the prior art, which is applied to the visible light signal sent by the mobile phone
Method used
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Embodiment 1
[0018] see figure 1 , is a flowchart of a coding method for a visible light signal provided in Embodiment 1 of the present invention, and the coding method includes:
[0019] S1O1: Set the duration of each high level and the duration of each low level. For example, set the duration of each high level to be 2ms, and the duration of each low level to be 30ms.
[0020] S102: The high-level groups are distinguished by a low-level delay, and each high-level group represents a signal by the number of high levels.
[0021] For example, the duration of each high level is 2ms, each group has a maximum of four high levels, each group of levels represents a 2bit signal, and four groups of signals represent a byte. That is: when the number of high levels in a group of signals is 1, it represents 00; when the number of high levels is 2, it represents signal 01; when the number of high levels is 3, it represents signal 10; when the number of high levels is 3, it represents signal 10; Whe...
Embodiment 2
[0027] see image 3 , is a flow chart of a method for transmitting a visible light signal provided in Embodiment 2 of the present invention, and the method includes:
[0028] S201: Set the duration of each high level and the duration of each low level. For example, set the duration of each high level to be 1.95ms, and the duration of each low level to be 30ms.
[0029] S202: Obtain identification data. Specifically, the identification data may be fingerprint information collected through the screen of the mobile phone, or information such as a digital password.
[0030] S203: Encode the acquired identification data in the following manner: high-level groups are distinguished by low-level delays, and each high-level group represents a signal by the number of high levels.
[0031] For example, the duration of each high level is 1.95ms, each group has a maximum of four high levels, each group of levels represents a 2-bit signal, and four groups of signals represent a byte. Th...
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Abstract
The invention discloses a coding method and a transmission method of visible light signals. The coding method comprises the following steps: distinguishing the high level groups according to delay of low level, and marking the signals by each high level group using the number of the high level; and combining the signals of each group to obtain the coding data. The transmission method comprises the following steps: coding the obtained data according to the following steps: distinguishing the high level groups according to the delay of low level, and marking the signals by each high level group using the number of the high level; and combining the signals of each group to obtain the identification data which are coded; and transmitting the identification data which are coded through an LED (light-emitting diode) lamp of a mobile phone by a form of flashlight, so that the condition that the visible light signals are transmitted through the LED lamp of the mobile phone is realized.
Description
technical field [0001] The present invention relates to the technical field of visible light communication, in particular to a coding method and a sending method of a visible light signal. Background technique [0002] Wirelessoptical communication technology, also known as visible light communication, communicates through high-frequency flickering of LED light sources. Light represents 1, and no light represents 0. Its transmission rate is as high as gigabits per second. Wirelessoptical communication transmits data through visible light. Compared with microwave technology, it has quite abundant spectrum resources, which is unmatched by general microwave communication and wireless communication. At the same time, visible light communication can be applied to any communication protocol and any environment; In terms of reliability, there is no need to worry about the content of communication being stolen; the equipment of wirelessoptical communication is flexible and conven...
Claims
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