Continuous piecewise sliding window estimation frequency offset-based frequency tracking method
A technology for estimating frequency offset and frequency tracking, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve problems such as large frequency errors, decreased frequency tracking performance, and unsatisfactory frequency estimation performance, and achieve improved demodulation performance effect
Active Publication Date: 2016-06-15
成都国恒空间技术工程股份有限公司
View PDF6 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Nowadays, unique code symbol-assisted transmission technology is widely used. There are many unique code-assisted frequency estimation algorithms in the case of small static or dynamic frequency offset changes, such as kay algorithm, FFT algorithm, etc. The frequency estimation performance under the condition is very unsatisfactory, and a large frequency error is often introduced during frequency compensation, thereby degrading the frequency tracking performance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0027] In the present invention, the unique code symbol is demodulated into segments according to a fixed length, and then each segment of the unique code is grouped and accumulated, and then the accumulated value of each segment is estimated by the M&M algorithm to obtain the frequency offset estimation value of each segment, which is compact. Then slide to the right with a certain unique code window length, and then calculate the frequency estimates of each segment in sequence according to the fixed unique code length, so that a series of continuous frequency estimates can be obtained, and finally these continuous frequency offset estimates are used Segmented frequency offset compensation is performed on continuous data frames.
[0028] S...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a continuous piecewise sliding window estimation frequency offset-based frequency tracking method. The method includes the following steps that: modulated information is removed from unique code symbols; the unique code symbols are segmented according to fixed length; each segment of unique code symbols is accumulated in a grouped manner; frequency estimation is performed on the cumulative value of each segment of unique code symbols by using an M&M algorithm, the frequency offset estimation value of each segment of unique code symbols is obtained; the frequency offset estimation values are slid rightwards with a certain unique code window length, and the frequency estimation value of each segment of unique code symbols is calculated sequentially according to a fixed unique code length, and therefore, a series of continuous frequency estimation values can be obtained; and the continuous frequency estimation values are adopted to perform piecewise frequency offset compensation on continuous data frames. According to the method of the invention, based on a continuous frame structure, a carrier aided unique code symbol piecewise sliding window is adopted to estimate frequency offset, and frequency offset compensation is carried out piecewise, and therefore, fine frequency synchronization can be realized. With the method adopted, the influence of the dynamic change of frequency offset on carrier tracking performance can be decreased as far as possible, and demodulation performance can be improved.
Description
technical field [0001] The invention relates to the field of wireless communication systems, in particular to a frequency tracking method for estimating frequency offset based on continuous segmented sliding windows. Background technique [0002] In the satellite mobile communication system, the baseband signal after demodulation and down-conversion is very susceptible to the influence of the environment, crystal oscillator instability and Doppler frequency offset, so it contains a dynamically changing carrier frequency offset, which will cause The constellation point offset makes the receiver unable to demodulate the source signal correctly, so accurate carrier frequency synchronization and compensation are required before demodulation. Usually, the carrier frequency synchronization is completed in two steps, that is, the initial acquisition and synchronization of the carrier is carried out first to compensate most of the frequency offset; secondly, the acquisition and trac...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/266
Inventor 曾娟邹刚徐鹏曾黎黎冯佳梅王晓玲
Owner 成都国恒空间技术工程股份有限公司