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

Precise frequency offset estimation method for burst spread spectrum weak signal

A frequency offset estimation and weak signal technology, which is applied in the field of spread spectrum communication, can solve the problems of low signal-to-noise ratio and carrier synchronization, etc., and achieve the effect of increasing accuracy and increasing the ability of frequency offset estimation

Active Publication Date: 2020-09-11
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a precise frequency offset estimation method for burst spread spectrum weak signals, which mainly solves the problem of carrier synchronization in harsh channel transmission environments such as multipath in DSSS communication systems with extremely low working signal-to-noise ratios

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
  • Precise frequency offset estimation method for burst spread spectrum weak signal
  • Precise frequency offset estimation method for burst spread spectrum weak signal
  • Precise frequency offset estimation method for burst spread spectrum weak signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0025] In resource-constrained sensor networks, low-cost ordinary crystal oscillators are usually used. Due to the frequency offset drift of the crystal oscillator, the carrier used to restore the signal at the receiving end has a frequency deviation from the local carrier. At the same time, there is a multipath in a multipath channel environment. Leer frequency shift phenomenon, the above factors will affect the correct reception of the si...

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 relates to a precise frequency offset estimation method for a burst spread spectrum weak signal, which comprises the following steps of: receiving an input signal for carrier frequency offset estimation; eliminating pseudo code information in the input signal according to P multi-path synchronous positions to obtain P receiving sequences for eliminating pseudo random codes; dividingthe receiving sequences into groups with a length of eta; separately carrying out pre-averaging processing on the grouped data with the length of eta; performing FFT with the length of L on the pre-averaged grouped data to obtain a discrete spectrum; and carrying out incoherent accumulation on the absolute value of the amplitude of the discrete spectrum to obtain S (k), finding a k value corresponding to the maximum spectral line in the S (k), and calculating a frequency offset estimation value. According to the method, the frequency offset estimation capability of weak spread spectrum signals is remarkably improved by collecting incoherent accumulated energy after multi-path signal frequency domain transformation, and meanwhile, the frequency offset estimation precision is improved through a grouping pre-averaging technology.

Description

Technical field [0001] The invention relates to the technical field of spread spectrum communication, in particular to a method for accurately estimating the frequency offset of a burst spread spectrum weak signal. Background technique [0002] The burst spread spectrum signal communication system has two characteristics: 1. Spread spectrum modulation; 2. Burst communication. On the one hand, spread spectrum technology can reduce the energy density and the probability of signal detection. On the other hand, burst signals are not easy to capture and have strong anti-interception capabilities. Therefore, burst spread spectrum communication systems are mostly used in deep space communications and military communications. It is suitable for scenarios with limited transmission power, long transmission distance, and severe electromagnetic interference. [0003] The frequency offset estimation algorithm of the burst communication system working in the environment of extremely low signal-...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7087
CPCH04B1/7087
Inventor 周磊磊马慧解永生覃荣华汪明亮
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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