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A receiving signal frequency offset estimation and compensation method for WCDMA

A frequency offset estimation and signal receiving technology, applied in the field of automatic frequency control function, to achieve the effect of accurate calculation results

Active Publication Date: 2007-05-30
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Abstract
  • Description
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  • 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

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  • 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

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Embodiment Construction

[0038] 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 Δf = F s N = 15000 1024 = 14.6484375 ( Hz ) directly determines the received signal The accuracy of the frequency offset estimate. where F s is the sampling frequency of the data, and its value...

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Abstract

This 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 the current test method problems of two small line range of delta phi is approximately equal to sin(delta phi).

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/01H04B1/12H04J13/00H04L25/02H04L25/03H04L27/26
Inventor 陈伟荆巍李锡忠
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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