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

A technology of pulse interval modulation and demodulation method, applied in free space transmission, electrical components, electromagnetic wave transmission system and other directions, can solve the problems of poor channel capacity, high bandwidth requirement, variable symbol length, etc., the principle and method are simple and easy to achieve Achieving a simple effect

Active Publication Date: 2022-02-22
西安标普信息科技有限公司
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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. The modulation method: first define the order of the modulation information, and then define the first two digits of the code of the modulation signal as a single high pulse "1" and a single empty protection time gap "0"; then compare d with 2 M‑1 The size relationship, if d<2 M‑1 , the source information first adds d information empty time slots, then adds the identification pulse "10" and an empty time slot "0", and then adds 2 M‑1 ‑d empty slots; if d≥2 M‑1 , first add 2 to the source information M ‑d‑1 information empty time slot, plus identification pulse "110" and a guard time slot, followed by 2 M‑1 +d-2 M empty time slot; demodulation method: first perform photoelectric conversion, then judge the identification pulse, and then complete demodulation and decoding. The present invention solves the problems of poor anti-interference ability and low power utilization rate of the existing OOK; solves the problem of difficult realization of time slot or frame synchronization in PPM; and solves the problems of DPIM symbol indeterminate length and modulation symbol overflow or waiting.

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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Patent Type & Authority Patents(China)
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 西安标普信息科技有限公司
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