Method for compensating for low-pass filter of compressed sampling system

A low-pass filter and compression sampling technology, applied in multi-terminal pair network, analog-to-digital converter, code conversion and other directions, can solve the problem of reconstructing the sequence error of the measured signal

Inactive Publication Date: 2014-07-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method for compensating the low-pass filter of the compressed sampling syste

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  • Method for compensating for low-pass filter of compressed sampling system
  • Method for compensating for low-pass filter of compressed sampling system
  • Method for compensating for low-pass filter of compressed sampling system

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[0038] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0039] In the present invention, using such as figure 1 The shown compressed sampling system samples the measured signal. In the actual compressed sampling system, the ideal low-pass filter is replaced by a Butterworth low-pass filter that can be realized by the circuit. In the present invention, with a known sparse signal, that is, the measured signal x(t) and the high-speed pseudo-random sequence p i (t), i=1,2,...,m for perception, the low-pass filter randomly demodulates the output baseband signal Perform filtering, and then use a low-speed ADC to sample the baseband...

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Abstract

The invention provides a method for compensating for a low-pass filter of a compressed sampling system. The method includes the steps that a sampling value error ye of the actual low-pass filter of the compressed sampling system is obtained by inputting a known tested signal x (t), a nonideal low-pass filter FIR coefficient error e is estimated, and then a nonideal low-pass filter FIR coefficient h is obtained; an FIR coefficient hd for correcting the filter is estimated on the basis, and then the corrected nonideal low-pass filter is made to be turned into an ideal low-pass filter; meanwhile, sampling frequency of the compressed sampling system is increased, the oversampling coefficient of the compressed sampling system is R, sampling values of channels are sampled, and then the sampled sampling values are filtered through a compensating filter. It is guaranteed that the sampled and filtered sampling values are equal to sampling values obtained through the ideal low-pass filter, and therefore the problem that large errors exist in the reconstruction process of a tested signal sequence x* (n) caused by the nonideal low-pass filter in the compressed sampling system is solved.

Description

technical field [0001] The invention belongs to the technical field of spectrum sparse signal compression sampling, and more specifically relates to a method for compensating the low-pass filter of the compression sampling system, which is used to compensate the non-ideal characteristics of the low-pass filter to reduce the compression sampling rate. The difficulty of system design. Background technique [0002] Compressive sampling technology based on modulated broadband converter is an under-sampling method based on compressed sensing theory, which can not only break through the limitation of sampling theorem on the sampling frequency of analog-to-digital converter (ADC), but also avoid the impact of ADC analog signal input bandwidth. The limitation of the sampling signal frequency. [0003] The existing relatively mature compressed sampling system uses m-channel pseudo-random sequence p i (t), i=1, 2,..., m sense the spectrum of the measured signal x(t) (mix in the mixe...

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Application Information

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IPC IPC(8): H03M1/12H03M7/30H03H7/01
Inventor 赵贻玖戴志坚王厚军王锂杨万渝
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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