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Frequency offset processing method and system for digital subcarrier multiplexing signal

A subcarrier multiplexing and processing method technology, applied in the field of frequency offset processing of digital subcarrier multiplexing signals, can solve the problems of spectrum efficiency reducing receiver sensitivity, deteriorating system transmission performance, etc., achieving no impact on complexity, modulation format transparent effect

Active Publication Date: 2021-08-17
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0006] The present invention overcomes the defect that the differential estimation method and the spectrum estimation method described in the prior art need to perform frequency offset estimation after dispersion compensation, which will deteriorate the system transmission performance, and the prior art needs to perform the frequency offset estimation after dispersion compensation. In the case of frequency offset compensation, the defect of sacrificing spectrum efficiency and reducing receiver sensitivity is generated. A frequency offset processing method and system for digital subcarrier multiplexing signals are provided. The technical solution is as follows:

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  • Frequency offset processing method and system for digital subcarrier multiplexing signal
  • Frequency offset processing method and system for digital subcarrier multiplexing signal
  • Frequency offset processing method and system for digital subcarrier multiplexing signal

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Embodiment 1

[0056] This embodiment discloses a frequency offset processing method for a digital subcarrier multiplexing signal. In this embodiment, an initial SCM signal with a baud rate of 64Gbaud is used, and each subcarrier adopts dual polarization 16-order quadrature amplitude modulation (DP- 16QAM) format, the number of subcarriers is 4, and the roll-off coefficient of the root-raised cosine shaping filter at the transmitting end is 0.1, so the bandwidth of each subcarrier is 64G / 4×(1+0.1)=17.6GHz. Introduce preset 1.5GHz frequency offset and additive Gaussian white noise during transmission, figure 2 It is the spectrum diagram of the SCM signal at the transmitting end and the receiving end, where the sampling rate is 80G / s. The implementation steps of the method are as follows figure 1 Shown, including the following detailed steps:

[0057] S1. Setting the frequency offset estimation range;

[0058] The frequency offset estimation range is [-mG, mG].

[0059] m is a real number...

Embodiment 2

[0087] This embodiment discloses a frequency offset processing system for digital subcarrier multiplexing signals, the system comprising: a range selection unit, a test frequency selection unit, a frequency offset compensation calculation unit, a low-pass filter, a signal power calculation unit, and a result processing unit ;

[0088] Use the range selection unit to set the frequency offset estimation range, the test frequency selection unit selects several test frequencies within the frequency offset estimation range, and the frequency offset compensation calculation unit uses each test frequency to test the initial SCM signal received by the signal receiving end. Offset compensation, using a low-pass filter to obtain the low-frequency SCM signal in the frequency offset-compensated SCM signal after frequency offset compensation, the signal power calculation unit calculates the signal average power of the low-frequency SCM signal, and the result processing unit obtains an estim...

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Abstract

The invention discloses a frequency offset processing method and system for a digital subcarrier multiplexing signal, and relates to the technical field of optical fiber communication. The method comprises the following steps: setting a frequency offset estimation range, selecting a plurality of test frequencies in the frequency offset estimation range, and carrying out the test frequency offset compensation of an initial SCM signal through each test frequency, independently calculating the signal average power of the low-frequency SCM signal in each frequency offset compensation SCM signal, obtaining a frequency offset estimation value according to the signal average power, and outputting the frequency offset compensation SCM signal corresponding to the frequency offset estimation value; according to the invention, the frequency offset compensation can be estimated before the dispersion compensation, the transmission performance of the system and the complexity of the dispersion compensation are not influenced, the spectrum efficiency of the SCM system is not sacrificed, and the modulation format is transparent.

Description

technical field [0001] The present invention relates to the technical field of optical fiber communication, and more specifically, to a frequency offset processing method and system for digital subcarrier multiplexing signals. Background technique [0002] Digital signal processing (DSP) has been widely used in coherent optical communication systems, and can effectively compensate for many types of linear impairments, such as chromatic dispersion (CD), frequency offset (FO), polarization mode dispersion (PMD), etc., however, optical fiber Nonlinear effects are still the determining factor limiting the transmission capacity of coherent optical communication systems. [0003] Digital subcarrier multiplexing (SCM) technology is commonly used in the latest coherent optical communication systems. Compared with traditional coherent optical communication systems using single-carrier technology, SCM systems have better anti-linear effects. In addition, SCM systems also have Greater...

Claims

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Application Information

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IPC IPC(8): H04B10/61
CPCH04B10/6164
Inventor 吕红向梦付松年王云才秦玉文
Owner GUANGDONG UNIV OF TECH
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