Model calibration of non-ideal lowpass filter in modulated wideband converter for compressive sampling

Purpose – The purpose of this paper is to present a model calibration technique for modulated wideband converter (MWC) with non-ideal lowpass filter. Without making any change to the system architecture, at the cost of a moderate oversampling, the calibrated system can perform as the system with ide...

Full description

Saved in:
Bibliographic Details
Published in:Compel 2015-05, Vol.34 (3), p.941-951
Main Authors: Zhao, Yijiu, Wang, Houjun, Dai, Zhijian
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Architecture
Broadband
Calibration
Compensation
Converters
Design
Electrical & electronic engineering
Engineering
Filtering
FIR filters
Fourier transforms
Impulse response
Low pass filters
Mathematical models
Noise
Oversampling
Signal reconstruction
Studies
Wideband
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Purpose – The purpose of this paper is to present a model calibration technique for modulated wideband converter (MWC) with non-ideal lowpass filter. Without making any change to the system architecture, at the cost of a moderate oversampling, the calibrated system can perform as the system with ideal lowpass filter. Design/methodology/approach – A known test sparse signal is used to approximate the finite impulse response (FIR) of the practical non-ideal lowpass filter. Based on the approximated FIR filter, a digital compensation filter is designed to calibrate the practical filter. The calibrated filter can meet the perfect reconstruction condition. The non-ideal sub-Nyquist samples are filtered by a compensation filter. Findings – Experimental results indicate that, by calibrating the MWC with the proposed algorithm, the impaction of non-ideal lowpass filter could be avoided. The performance of signal reconstruction could be improved significantly. Originality/value – Without making any change to the MWC architecture, the proposed algorithm can calibrated the non-ideal lowpass filter. By filtering the non-ideal sub-Nyquist samples with the designed compensation filter, the original signal could be reconstructed with high accuracy.
ISSN:0332-1649
2054-5606
DOI:10.1108/COMPEL-06-2014-0138