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A Super-Nyquist Atmospheric Optical Communication Method Based on Phase Shift Keying and Pulse Position Modulation

A pulse position modulation and super-Nyquist technology, which is applied in the field of super-Nyquist atmospheric optical communication, can solve the problems of communication system performance degradation, complex uncertain factors, etc., and achieve the effect of increasing the transmission rate

Active Publication Date: 2022-05-24
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, there are complex uncertain factors in the outdoor atmospheric channel, which leads to the deterioration of the performance of the communication system

Method used

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  • A Super-Nyquist Atmospheric Optical Communication Method Based on Phase Shift Keying and Pulse Position Modulation
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  • A Super-Nyquist Atmospheric Optical Communication Method Based on Phase Shift Keying and Pulse Position Modulation

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Embodiment Construction

[0026] The invention proposes a super Nyquist atmospheric optical communication method combining phase shift keying and pulse position modulation. This method introduces FTN technology in atmospheric optical communication and combines it with 4PPM modulation mode, so as to break through the limitation of Nyquist criterion and further improve the transmission rate of the system. Describe the present invention in detail below with specific embodiment in conjunction with accompanying drawing

[0027] The present invention achieves through following technical measures:

[0028] 1. Basic assumptions

[0029] The present invention adopts 4PPM-QPSK mixing, the channel state obeys the Gamma-Gamma distribution, assumes that background light has been filtered out by a filter, and only considers additive Gaussian white noise. This assumption is typical for such systems and not a specific requirement of the present invention.

[0030] 2. Specific implementation methods

[0031] accord...

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Abstract

The super-Nyquist atmospheric optical communication method of phase-shift keying combined with pulse position modulation. At the sending end, first divide the sent binary information sequence into equal parts, map half of it to Gray code and convert it into a 4PPM signal, and use Gray code on the other half Map and convert to QPSK signal, then load the modulated QPSK signal to 4PPM signal to form 4PPM‑QPSK mixed signal, and the signal is passed through super Nyquist shaping filter to form QPSK‑4PPM‑FTN signal. Therefore, the transmission rate is greater than the Nyquist rate; the receiving end realizes the recovery of the QPSK signal by using a matched filter, super-Nyquist sampling and squarer to detect 4PPM signals and hard decision. Compared with the traditional wireless optical communication system, the introduction of FTN technology effectively improves the system transmission rate, which has reference value for the design of new atmospheric optical communication systems.

Description

technical field [0001] The invention relates to a super Nyquist atmospheric optical communication method combining phase shift keying with pulse position modulation. The method combines quaternary phase shift keying (QPSK, Quadrature Phase Shift Keying), 4th order pulse position modulation (4PPM , Pulse Position Modulation) combined with Faster-than-Nyquist (FTN, Faster-than-Nyquist) technology, which further improves the transmission rate of the atmospheric optical communication system, and belongs to the field of wireless optical communication technology. Background technique [0002] With the continuous increase of wireless communication network's requirements on network capacity, speed and delay. Atmospheric laser communication, as one of the alternative technologies for next-generation communication, has the advantages of unlimited spectrum and flexible links. However, the atmospheric laser communication system is easily affected by weather, aerosol and turbulence, whi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11H04L27/20H04L25/49H04L25/03
CPCH04B10/11H04L27/2053H04L25/4902H04L25/03006
Inventor 曹明华吴照恒王惠琴张伟康中将王博豆红霞黄超刘玲
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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