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

GMSK signal demodulation method

A signal demodulation and signal technology, applied in modulated carrier systems, phase modulated carrier systems, digital transmission systems, etc., can solve the problems of high implementation cost, long lock-in time, and difficulty in applying signal analysis and measurement instruments.

Active Publication Date: 2020-03-24
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantages of the existing technical solutions are: firstly, there is a loop lock-in process in the synchronization, and the lock-in time is long, which is not suitable for demodulating short data; secondly, programmable logic devices are mostly used for implementation, and the implementation cost is high, and the program portability is poor; thirdly, When it adopts the non-phase-locked loop forward synchronous demodulation scheme, the carrier synchronization frequency offset estimation accuracy is not enough, resulting in low demodulation index
Based on the above shortcomings, the existing technical solutions are difficult to apply to signal analysis and measuring instruments

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
  • GMSK signal demodulation method
  • GMSK signal demodulation method
  • GMSK signal demodulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0105] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0106] A kind of GMSK signal demodulation method, its flow process is as Figure 4 shown, including the following steps:

[0107] Step 1: Sampling rate conversion;

[0108] The forward synchronization algorithm of the GMSK signal requires its oversampling rate to be an integer multiple of the symbol rate, while the symbol rate of the transmitted GMSK signal is arbitrary, and the acquisition bandwidth of receiving devices such as signal analyzers is a fixed acquisition bandwidth file determined by the hardware The position and gear switching are set by the user, which determines that there is no definite proportional relationship between the two values. Therefore, it is necessary to convert the oversampling rate of the collected GMSK signal to the symbol rate through an algorithm. Integer multiples of

[0109] Step 2: Timing error estimation a...

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 discloses a GMSK signal demodulation method. The invention belongs to the technical field of electronic measuring instrument signal modulation characteristic testing. The invention designs a demodulation test method for a modulation characteristic test of a GMSK signal. By adopting a forward demodulation scheme, the problem of contradiction between short data and high-precision demodulation caused by a loop locking process in an existing feedback demodulation scheme is solved, and the method can adapt to a short data demodulation test, and is wide in test scene application rangeand high in test scene applicability; by improving a carrier synchronization link in a forward demodulation scheme and adding frequency offset fine estimation, the frequency offset estimation range isensured, the estimation precision is improved, high-precision demodulation is realized, and the problem of low demodulation precision of an existing forward demodulation scheme is solved.

Description

technical field [0001] The invention belongs to the technical field of signal modulation characteristic testing of electronic measuring instruments, and in particular relates to a GMSK signal demodulation method. Background technique [0002] As a continuous phase modulation (CPM) signal, the GMSK signal is widely used in military radio stations, GSM systems, GPRS systems, Digital TV, satellite communication, ship automatic identification system (AIS), aviation data link and other fields have been widely used. However, the transmitter of the GMSK communication system usually needs to test the modulation performance before it is applied, and at the same time, some fault diagnosis of the transmitting equipment also needs to be tested for the modulation performance. The signal analyzer has developed from a single spectrum test to a multi-functional test instrument for testing and analyzing signals from multiple angles in the time domain, frequency domain, and modulation domain...

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): H04L27/22H04L27/20
CPCH04L27/22H04L27/2003
Inventor 韩翔王峰周钦山
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