Modulation format identification method based on signal envelope flatness
A modulation format and identification method technology, applied in the field of modulation format identification based on signal envelope flatness, can solve problems such as large computational complexity, and achieve the effects of low computational complexity, fast identification response speed, and excellent system performance
Active Publication Date: 2022-05-24
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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[0004] Aiming at the above-mentioned deficiencies in the prior art, a modulation format identification method based on the flatness of the signal envelope provided by the present invention solves the problems that the existing modulation format identification method requires prior information and has high computational complexity
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[0043] The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes Such changes are obvious within the spirit and scope of the present invention as defined and determined by the appended claims, and all inventions and creations utilizing the inventive concept are within the scope of protection.
[0044] like figure 1 As shown, the modulation format identification method based on signal envelope flatness includes the following steps:
[0045] S1. Mix the received signal light with the local oscillator light generated by the local oscillator, obtain an electrical signal through a photodetector, and convert the electrical signal into a digital signal;
[0046] S2. Perform dispersion compensation, clock recovery and constant modulus e...
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The invention discloses a modulation format identification method based on signal envelope flatness, which relates to the field of communication, and comprises the following steps: carrying out amplitude normalization on a preprocessed digital signal to obtain a signal with an amplitude mean value of 1; respectively selecting one path of polarization signals with the amplitude ranges of 0-1, 0-1.2 and 0-0.6 on single wavelengths, and calculating the envelope flatness of the polarization signals to correspondingly obtain the envelope flatness R1, R2 and R3; and completing the modulation format identification of the signal according to the size relationship between the R1, R2 and R3 and the corresponding threshold values th1, th2 and th3. According to the envelope characteristics of the signal amplitude, different modulation formats can be accurately identified in a large optical signal-to-noise ratio range without knowing prior information such as symbol rate and optical signal-to-noise ratio, a large number of training samples are not needed to train the algorithm in advance, the calculation complexity is low, the identification response speed is high, and the method is suitable for large-scale popularization and application. And the method is not sensitive to frequency deviation and carrier phase noise.
Description
technical field [0001] The invention relates to the field of communications, in particular to a modulation format identification method based on signal envelope flatness. Background technique [0002] In order to cope with the rapidly growing network traffic demand and different data services such as big data, the Internet of Things, and cloud computing, the next-generation optical network requires higher spectral efficiency and greater flexibility. Therefore, Elastic Optical Network (EON) ) concept came into being. Elastic optical network can dynamically adjust various transmission parameters, such as modulation format, transmission rate, spectrum allocation, etc., according to different transmission distances and channel state information, so it has received more and more attention. Although EON can dynamically adjust the modulation format at the transmitting end, at the receiving end, the digital coherent receiver needs to automatically identify the modulation format of ...
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IPC IPC(8): H04L27/00H04B10/69
CPCH04L27/0012H04B10/6971
Inventor 郝明蒋学冻
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING