Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method

A technology of carrier synchronization and large frequency offset, applied in the field of OQPSK, can solve the problems of small phase jitter, mutual interference between carrier phase synchronization and clock synchronization, etc., achieve accurate estimation, provide estimation accuracy, and control method is simple and effective.

Inactive Publication Date: 2017-12-15
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for OQPSK signal carrier synchronization with large frequency deviation based on multi-level architecture, which solves the problem of mutual interference between carrier phase synchronization and clock synchronization in existing OQPSK modulation, and simultaneously realizes large frequency deviation of carrier frequency. capture with minimal phase jitter after capture

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method
  • Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method
  • Multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0043] combine figure 2 , a carrier synchronization method for OQPSK signals with large frequency offsets based on a multi-level architecture, including using the iterative delay multiplication forward frequency estimation method to perform rough estimation of the carrier frequency to achieve fast carrier locking; for the residual frequency offset phase, a combination of carrier The joint estimation method of synchronization and bit synchronization realizes the simultaneous estimation of carrier phase and bit information, proposes a deconvolution method to eliminate the 180-degree integral multiple ambiguity of carrier phase, and uses an automatic sliding window accumulation method to realize accurate estimation of carrier phase.

[0044] Specifically include the following steps:

[0045]Step 1: When roughly estimating th...

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

No PUM Login to View More

Abstract

The invention provides a multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method. The multi-stage framework based OQPSK signal big-frequency-offset carrier synchronization method comprises the steps of performing rough estimation of a carrier frequency by utilizing an iterative time delay multiplication forward frequency estimation method so as to realize rapid locking of the carrier; realizing synchronous estimation of a carrier phase and bit information by adopting a joint estimation method of combining carrier synchronization with bit synchronization for residual frequency offset phase positions; and eliminating 180-degree integral multiple ambiguity problem of the carrier phase by using an unwinding and unfolding method, and realizing precise estimation of the carrier phase by adopting an automatic sliding window accumulation method. The problem of mutual interference between carrier phase synchronization and clock synchronization in existing OQPSK modulation is solved, big-frequency offset rapid capture of the carrier frequency is realized at the same time, and extremely small phase jitter exists after the capture.

Description

technical field [0001] The invention relates to the field of OQPSK, in particular to a method for synchronizing carriers with large frequency offsets of OQPSK signals based on a multi-level structure. Background technique [0002] OQPSK is a constant-envelope digital modulation technique, and the quadrature branch symbol and the in-phase branch symbol are offset in time by a bit interval, that is, half a symbol period. The OQPSK signal eliminates the radian deflection phenomenon of adjacent symbols. In the actual communication system with limited bandwidth, the envelope fluctuation is small. After passing through the nonlinear power amplifier, there will be no obvious power spectrum sidelobe growth effect, and it has high spectrum utilization and High power utilization features. [0003] OQPSK signal usually adopts coherent demodulation mode, in order to obtain good receiving performance and communication quality, it should realize accurate carrier synchronization as much a...

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
no application Login to View More
IPC IPC(8): H04L27/26H04L27/20
CPCH04L27/20H04L27/2657H04L27/2668
Inventor 张光山刘磊王振兴张一民郭荣斌
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com