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Device and method for sample frequency deviation robust estimation in complex channel environment

A technology of sampling frequency and channel environment, applied in multi-frequency code systems, shaping networks in transmitter/receiver, baseband system components, etc., to reduce chip area, reduce implementation complexity, and reduce implementation costs.

Active Publication Date: 2015-06-24
MAXSCEND MICROELECTRONICS CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to be able to robustly estimate the sampling frequency deviation in a complex channel environment

Method used

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  • Device and method for sample frequency deviation robust estimation in complex channel environment
  • Device and method for sample frequency deviation robust estimation in complex channel environment
  • Device and method for sample frequency deviation robust estimation in complex channel environment

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Embodiment 1

[0039] The device for robustly estimating the sampling frequency deviation in a complex channel environment first performs circular convolution operations on the modulus values ​​of two adjacent time-domain channel impulse responses, and then finds the position of the maximum value of the circular convolution results, and according to The position of the maximum value of the circular convolution result estimates the sampling frequency deviation.

[0040] Preferably, a device for robustly estimating sampling frequency deviation in a complex channel environment, such as Figure 4 As shown, it includes: a first FFT (Fast Fourier Transform) module, a second FFT module, a reverse operation module, a multiplier, an IFFT (Fast Inverse Fourier Transform) module, and a maximum value search module.

[0041] The first FFT module is used to perform fast Fourier transform on one |h1(i)| in the modulus values ​​of the two adjacent channel time-domain impulse responses, and the output is den...

Embodiment 2

[0051] The method for robustly estimating the sampling frequency deviation in a complex channel environment first performs circular convolution operations on the modulus values ​​of the two adjacent time-domain channel impulse responses, and then finds the maximum position of the circular convolution results, and according to the circular convolution The maximum position of the convolution result estimates the sampling frequency deviation.

[0052] Preferably, the method for robustly estimating the sampling frequency deviation in a complex channel environment includes the following steps:

[0053] 1. Obtain the time-domain impulse response modulus of two adjacent channels, recorded as |h1(i)| and |h2(i)|, where i=0,1...N-1, N is the fast Fourier transform points;

[0054] 2. Output |h2(i)| in reverse order, that is, output according to |h2(N-1-i)|, i=0,1...N-1;

[0055] 3. Perform N-point fast Fourier transform operations on |h1(i)| and |h2(N-1-i)|, respectively, to obtain C...

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Abstract

The invention discloses a device and method for sample frequency deviation robust estimation in a complex channel environment. Firstly, cyclic convolution operation is carried out on module values of two adjacent time domain channel impulse responses; then the position of the maximum value of cyclic convolution results is found; a sample frequency deviation is estimated according to the position of the maximum value of the cyclic convolution results, and the sample frequency deviation is estimated in a robust mode in the complex channel environment. In particular, as for OFDM systems like a CMMB, hardware resources can be reused, the achievement complexity is reduced accordingly, the ship area is reduced, and the achievement cost is reduced.

Description

technical field [0001] The invention relates to digital communication technology, in particular to a device and method for robustly estimating sampling frequency deviation in a complex channel environment. Background technique [0002] Sampling frequency offset refers to the deviation between the receiver's clock and the transmitter's clock frequency. Usually caused by an inaccurate resonant frequency of the crystal oscillator used in the receiver. The existence of sampling frequency offset will affect the performance of the receiver, and even cause it to fail to work in severe cases. On the other hand, the accuracy of the resonant frequency of the crystal oscillator is related to the processing accuracy of the crystal. The higher the frequency accuracy requirement, the higher the processing accuracy of the crystal, which brings high costs. Therefore, the actual terminal equipment usually uses relatively cheap crystals with low processing precision, thereby reducing the BO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 蒋朱成
Owner MAXSCEND MICROELECTRONICS CO LTD
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