Carrier frequency correction method based on smooth tracking

A carrier frequency, smooth tracking technology, applied in the direction of modulation carrier system, digital transmission system, electrical components, etc., can solve the problem of occupying hardware resources, achieve the effect of eliminating jitter, reducing multiplication operations, and reducing the amount of calculation

Active Publication Date: 2012-12-26
WUHAN POST & TELECOMM RES INST CO LTD
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  • Abstract
  • Description
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Problems solved by technology

Therefore, a large number of multiplication operations are required in the above-mentioned deviation correction links, which will undoubtedly occupy a large amount of hardware resources

Method used

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  • Carrier frequency correction method based on smooth tracking
  • Carrier frequency correction method based on smooth tracking
  • Carrier frequency correction method based on smooth tracking

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0025] The carrier frequency correction method based on smooth tracking of the present invention comprises the following steps:

[0026] S1. From the pre-correction frequency queue f n Select multiple pre-correction frequencies f in ascending order k , grouping the sequentially received signal sequences by a fixed number to obtain a set S k , each group of signals corresponds to a pre-correction frequency f k Perform frequency pre-correction to obtain multiple pre-correction signal sets S corresponding to each pre-correction frequency fk k '. The number of signals in the group is 2 l (l is a positive integer), such as 2 12 =4096, to satisfy the FFT operation. The frequency pre-correction is specifically for the set S k The x-th symbol in is multiplied by T is the symbol period, f k For each pre-correction frequency selected in order...

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Abstract

The invention discloses a carrier frequency correction method based on smooth tracking, relating to the technical field of modulating and demodulating. The carrier frequency correction method comprises the following steps of: constructing a pre-correction frequency queue, and pre-correcting corresponding to different pre-correction frequencies after grouping continuously received signals; acquiring actual frequency deviations under different pre-correction frequencies by a frequency domain analysis method to find out pre-correction frequencies corresponding to the minimum actual frequency deviation, and using the found pre-correction frequencies as optimal frequency estimated values; averaging the cached optimal frequency estimated values to acquire a smooth frequency difference estimated value which is used for correcting the final signal frequency; and simultaneously constructing a next pre-correction frequency queue. The carrier frequency correction method is applicable to various modulating formats, and multiplication can be greatly reduced while lasting large-scale frequency difference tracking is ensured.

Description

technical field [0001] The invention relates to the technical field of modulation and demodulation, in particular to a carrier frequency correction method based on smooth tracking. Background technique [0002] The synchronization of carrier frequency is an important link in coherent communication. Its purpose is to synchronize the frequency difference between the signal and the local oscillator frequency, and finally recover the phase information of the received signal accurately. In the field of coherent optical communication, digital processing methods are mostly used for frequency compensation, that is, various deviations are estimated and compensated by digital processing at the receiving end, instead of adjusting the wavelength of the light source. In order to improve spectral efficiency and simplify signal processing, frequency synchronization in optical communication often uses blind estimation, that is, the frequency difference is estimated based on the statistical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
Inventor 刘武杨奇杨铸
Owner WUHAN POST & TELECOMM RES INST CO LTD
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