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

A receiving signal frequency offset estimation and compensation method for WCDMA

A technology for frequency offset estimation and signal reception, applied in transmitter/receiver shaping network, multi-frequency code system, baseband system components, etc., to achieve accurate calculation results

Active Publication Date: 2011-08-17
WUHAN HONGXIN TELECOMM TECH CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of frequency offset estimation and compensation is to overcome the existing frequency offset detection method. The linear range of Δφ≈sinΔφ is too small to affect the accuracy of frequency offset estimation, and the existing frequency offset compensation method has no practical significance for improving the calculation accuracy of CPICH RSCP. Defects

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
  • A receiving signal frequency offset estimation and compensation method for WCDMA
  • A receiving signal frequency offset estimation and compensation method for WCDMA
  • A receiving signal frequency offset estimation and compensation method for WCDMA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The baseband data is first sent to the multipath search and multipath separation unit for multipath position search and multipath separation to obtain one or more multipath signals; despread the pilot channel for each multipath signal to obtain pilot symbols and The pilot symbols are cached; after the cached pilot symbols are full for two frames (300 pilot symbols), the zero padding operation is first performed, and then a 1024-point fast Fourier transform (FFT) is performed to obtain an estimated frequency offset of the received signal, 1024 Frequency resolution of point FFT It directly determines the accuracy of the frequency offset estimation value of the received signal. where F s is the sampling frequency of the data, and its value here should be the symbol rate of the common pilot channel, namely N is the data length of the fast Fourier transform.

[0032] In order to improve the accuracy of the estimated value of the frequency offset of the received signal, ...

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 present invention discloses one Fourier change by use of guide frequency character to get the signal frequency bias estimation values and for frequency two time plug values through estimation values on bias frequency to improve estimation accuracy and compensation method. This invention method overcomes problems which exist in the current test method that the line range that delta phi is approximately equal to sin(delta phi) is too small that the accuracy of the frequency bias estimation is affected, and the prior frequency bias compensation method has no practical meaning for improving CPICH RSCP computational accuracy.

Description

technical field [0001] The present invention relates to the automatic frequency control (AFC) function of the receiver in the third generation mobile communication system, and more specifically refers to the frequency offset estimation and compensation method of the WCDMA system downlink received signal. Background technique [0002] In any bandpass digital communication system, the transmitter modulates the information to the carrier frequency f c Above, the receiving end must recover the carrier, so that the constellation diagram of the received signal will not rotate, and the signal-to-noise ratio (SNR) performance of the demodulated signal will not decrease. [0003] Although the receiving end knows the carrier frequency of the sending end, there are two reasons for the carrier frequency difference between the sending end and the receiving end. First, the receiver uses a frequency synthesizer to generate a carrier, and the frequency synthesizer uses a local clock as a t...

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 Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 陈伟荆巍李锡忠
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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