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Method and device for expanding frequency offset estimation range of demodulation data

A technology for demodulating data and estimating frequency offset, applied in digital transmission systems, modulated carrier systems, electrical components, etc., can solve problems such as errors

Active Publication Date: 2010-12-15
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

If the actual value of the frequency deviation exceeds this range, an error will occur

Method used

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  • Method and device for expanding frequency offset estimation range of demodulation data
  • Method and device for expanding frequency offset estimation range of demodulation data
  • Method and device for expanding frequency offset estimation range of demodulation data

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Embodiment Construction

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0053] refer to figure 1 , which shows a schematic flowchart of a first embodiment of a method for expanding the frequency offset estimation range of demodulated data in the present invention, the method includes:

[0054] Step S110 , precompensating the first demodulated data with at least one first frequency offset value to obtain at least one second demodulated data.

[0055] It should be understood that each first frequency offset value in the at least one first...

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Abstract

The invention discloses a method and a device for expanding a frequency offset estimation range of demodulation data. The method comprises the following steps of: pre-compensating first demodulation data with at least one first frequency value to acquire at least one second demodulation data; calculating at least one second frequency offset value of the at least one second demodulation data respectively, and compensating the second demodulation data according to the second frequency offset value respectively to acquire at least one third demodulation data; and evaluating the phase dispersion of the at least one third demodulation data respectively, determining the third demodulation data with the minimum phase dispersion and acquiring the frequency offset compensation value of the third demodulation data with the minimum phase dispersion, wherein the frequency offset compensation value is used as a frequency offset estimation result and is the accumulation of the first frequency offset value and the second frequency offset value. By expanding the demodulation data-based frequency offset estimation range, a more accurate frequency offset estimation value can be acquired.

Description

technical field [0001] The present invention mainly relates to the field of wireless communication, in particular to a method and a device for enlarging the frequency offset estimation range of demodulated data. Background technique [0002] With the development and popularization of wireless communication, the number of mobile communication users is increasing exponentially, especially the mobile users in China have been growing at a rate of more than 150% in recent years. Users have higher and higher requirements for communication speed and quality. In the wireless communication system, when the user terminal is turned on, there is a large frequency deviation between the carrier frequency and the local crystal oscillator. In addition, the Doppler frequency shift caused by the rapid movement of the mobile terminal will also make the carrier frequency and the local crystal oscillator. There is a large frequency deviation between them. Only by quickly and effectively estima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B1/707
Inventor 马振国何成林
Owner ST ERICSSON SEMICON BEIJING
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