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Method and apparatus of estimating sampling frequency offset, and sampling timing recovery loop having the apparatus

A technology of sampling frequency offset and sampling timing, applied in synchronization devices, multi-frequency code systems, analog-to-digital converters, etc.

Active Publication Date: 2013-02-13
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] If the sampling result is output during the sampling timing error, the accuracy of the digital data signal D_in may seriously deteriorate

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  • Method and apparatus of estimating sampling frequency offset, and sampling timing recovery loop having the apparatus
  • Method and apparatus of estimating sampling frequency offset, and sampling timing recovery loop having the apparatus
  • Method and apparatus of estimating sampling frequency offset, and sampling timing recovery loop having the apparatus

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Embodiment Construction

[0020] Illustrative but non-limiting embodiments of the present invention will be described below. First, however, refer to the figure 2 The sampling timing recovery loop shown in Schematically describes the sampling timing recovery operation.

[0021] figure 2 The sample timing recovery loop includes sampler 220 , oscillator 230 , data filter 250 , interpolator 260 , detector and estimator 270 , loop filter 280 and controller 290 . More precisely, in figure 2 Among them, interpolator 260, detector and estimator 270, loop filter 280 and controller form a sampling timing recovery loop.

[0022] The sampler 220 converts the analog data signal into a discrete data signal based on the sampling clock CK input from the oscillator 230 . The discrete data signal output from the sampler 220 is input to the interpolator 260 via the data filter 250 . The interpolator 260 interpolates the discrete data signal to output the sampled data signal DATA_smpl. The sampled data signal DA...

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Abstract

An apparatus for estimating a sampling frequency offset includes a waveform characteristic extraction unit, a variation quantity calculation unit, and a SFO (sampling frequency offset) estimator. The waveform characteristic extraction unit extracts a waveform characteristic of a training sequence period in one frame period of a sample data signal and outputs a waveform characteristic value corresponding to the waveform characteristic of the training sequence period. The variation quantity calculation unit calculates a waveform characteristic variation quantity representing a variation quantity in waveform characteristic between an m-th frame and an (m−k)-th frame based on a waveform characteristic value in the m-th frame and a waveform characteristic value in the (m−k)-th frame, where m and k are independently integers of 1 or more. The SFO estimator estimates an SFO of the sample data signal based on the waveform characteristic variation quantity.

Description

[0001] Cross References to Related Applications [0002] Priority is claimed on Korean Patent Application No. 10-2007-0071279 filed with the Korean Intellectual Property Office on July 16, 2007, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention generally relates to a method and apparatus for estimating sampling frequency offset, and a sampling timing recovery loop having the same, and more particularly, to a technique for estimating sampling frequency offset based on the variation of waveform characteristics in each frame. Background technique [0004] Sampling is necessary to convert an analog data signal into a digital data signal. For example, in receivers of broadcasting and communication systems, digital data signals are obtained by sampling analog data signals received via wired and / or wireless channels. The timing at which an analog data signal is sampled (ie, sampling timing) has a significant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12
CPCH04L7/0029H04L7/007H04L27/26
Inventor 刘光辉
Owner SAMSUNG ELECTRONICS CO LTD