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Pulse interval modulation and demodulation method based on wireless ultraviolet light communication

A technology of pulse interval modulation and demodulation method, which is applied in the field of wireless communication, can solve problems such as poor channel capacity, high bandwidth demand, and uncertain symbol length, etc., and achieves the effect of simple principle and method, easy implementation, and simple principle

Active Publication Date: 2019-09-24
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a pulse interval modulation and demodulation method based on wireless ultraviolet light communication, which solves the problems of indefinite symbol length, high bandwidth requirement and poor channel capacity in existing modulation methods

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  • Pulse interval modulation and demodulation method based on wireless ultraviolet light communication
  • Pulse interval modulation and demodulation method based on wireless ultraviolet light communication
  • Pulse interval modulation and demodulation method based on wireless ultraviolet light communication

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Embodiment Construction

[0028] The present invention will be further described in detail below in combination with specific embodiments.

[0029] The present invention is based on the pulse interval modulation and demodulation method of wireless ultraviolet light communication, specifically implemented according to the following steps:

[0030] Step 1, define the modulation order of the information source information, specifically define the initial value of the modulation order M of the binary information source information, the value that M can take is: a natural number that is not zero, and map the M-bit binary information source information to the length for 2 M-1 +5 time slots on a time frame segment.

[0031] Step 2: Modulate and encode the source information to obtain a modulated signal, and send the modulated signal through UVTOP255 ultraviolet LED;

[0032] The modulation and coding in step 2 is specifically implemented according to the following steps:

[0033] Step 2.1, define the first...

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Abstract

The invention discloses a pulse interval modulation and demodulation method based on wireless ultraviolet light communication, and the modulation method comprises the steps: firstly defining the order of modulation information, and then defining two bits, before coding, of a modulation signal as a single high pulse '1' and a single air protection time slot '0'; comparing the size relationship between d and 2M-1, if d is less than 2M-1, firstly adding d information empty time slots to the information source information, then adding an identification pulse '10' and an empty time slot '0', and then adding 2M-1-d empty time slots; if d is greater than or equal to 2M-1, adding 2M-d-1 information empty time slots to the information source information, then adding an identification pulse '110' and a protection time slot, and then adding 2M-1 + d-2M empty time slots. The demodulation method comprises the following steps: firstly, carrying out photoelectric conversion, then judging the identification pulse, and then finishing demodulation and decoding. According to the invention, the problems of poor anti-interference capability and low power utilization rate of the existing OOK are solved. The problem that time slot or frame synchronization of the PPM is difficult to realize is solved. The problems that the DPIM symbol is uncertain in length and the modulation symbol overflows or waits are also solved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a pulse interval modulation and demodulation method based on wireless ultraviolet light communication. Background technique [0002] With the exploration of wireless optical communication by researchers, a new type of wireless ultraviolet light communication technology was discovered, which can realize direct-view and non-direct-view communication, and solve the problem of high alignment of receiving and sending ends in traditional communication methods. And gradually become a research hotspot. Modulation and demodulation technology in wireless ultraviolet communication has a great influence on the quality of communication. The application of modulation and demodulation technology can reduce bit errors and improve the error performance and communication quality of the system. [0003] The modulation and demodulation methods in ultraviolet light communi...

Claims

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Application Information

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IPC IPC(8): H04B10/11H04B10/516H04B10/50H04B10/60
CPCH04B10/11H04B10/516H04B10/502H04B10/60
Inventor 宋鹏万杰峰杨永坤荆光瑞
Owner XI'AN POLYTECHNIC UNIVERSITY
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