Channel gain mismatch and time delay calibration for modulated wideband converter‐based compressive sampling

Dong, Ningfei; Wang, Jianxin

doi:10.1049/iet-spr.2013.0137

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…It is possible to provides these values for any compensation method, so that the effect of the reconstruction algorithms is removed. The obtained results demonstrate that it is possible to estimate the delay of each channel without the use of reconstruction algorithms, matrix manipulations and test signals [7,8], using a simple and easy-to-implement approach. However, it is still necessary to carry out further studies on how to use these estimated values in the measurement compensation, so that the method can be better evaluated with, for example, figures of merit.…”

Section: Discussionmentioning

confidence: 85%

“…Regarding the problem of synchronization between the input signal and the AIC control signals, some AIC calibra-tion methods deal this problem by using sinusoids with unknown phases to estimate the frequency response of the system transfer and blind calibration using sparse recovery algorithms to estimate the delay coefficients [7,8,9,10]. However, these algorithms are sensible to their input parameters and, depending on the reconstruction method, may not correspond the ideal response, which may mask effects produced by the physical characteristics of the AIC.…”

Section: Introductionmentioning

confidence: 99%

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A method for delay estimation between channels of Analog to Information Converters

Arruda

Gurjão

Freire

2022

JICS

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Analog to Information Converters (AIC) implements signal acquisition in Compressed Sensing. AIC performance is affected by noise and hardware imperfections. In parallel Random Modulator Pre-Integrator (RMPI) architectures, delay among channels reduces the performance; thus, delay estimation and compensation methods are necessary. In previous works, delay estimation compares a reference signal with a reconstructed signal from the AIC output; however, such methods produce different results according to the recovery method. To avoid this problem, we present a method based on a controlled delay signal to estimate channel delay without the necessity of signal recovery. The obtained results show the technique's feasibility and the possibility of its use as a built-in calibration process for AIC.

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Section: Discussionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

A method for delay estimation between channels of Analog to Information Converters

Arruda

Gurjão

Freire

2022

JICS

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“…However, the time difference is introduced by a non-zero wiring delay in the practical implementation. This time difference can be taken into account as a linear phase shift in the sensing matrix as pointed out by [7], [21], [29]. In the proposed technique, the time difference between PSF and ADC clock is automatically included in the actualc i,l in (24).…”

Section: Calibration Of the Actual Sensing Matrixmentioning

confidence: 99%

A Calibration Technique for Simultaneous Estimation of Actual Sensing Matrix Coefficients on Modulated Wideband Converters

Byambadorj

Asami

Yamaguchi

et al. 2020

IEEE Trans. Circuits Syst. I

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The Modulated Wideband Converter (MWC) is one of the promising sub-Nyquist sampling architectures for sparse wideband signal sensing applications. Its frequency support detection and the reconstruction ability is well-defined through compressed sensing theory. However, the reconstruction performance of the MWC is strictly limited by the non-ideal components in practical implementations. Previous calibration methods exploit sequential single-tone signals to estimate the actual transfer function of the MWC, which is fairly timeconsuming. We propose a new calibration method that estimates the actual sensing matrix coefficients of the MWC only with a single measurement based on a pilot multi-tone signal. The feasibility of the proposed calibration method is demonstrated in terms of normalized mean square error (NMSE) and image rejection ratio (IRR) of the reconstructed original signal.

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“…The authors of [33] defined a gain error matrix to model the gain mismatch. In [34], the authors proposed a calibration method to solve the channel gain mismatch and time‐delay issue. In [35], the authors proposed a calibration algorithm to find the effective transfer‐matrix.…”

Section: Introductionmentioning

confidence: 99%

Successive‐phase correction calibration method for modulated wideband converter system

Jiang

Deng

et al. 2019

IET signal process.

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The modulated wideband converter (MWC) is a sub-Nyquist sampling system recently proposed for sampling sparse multi-band signals. However, due to non-ideal analogue components, transfer-matrix calibration is required for the successful reconstruction. In practice, it is difficult to control the phases of the consecutive sinusoidal inputs precisely which are used to calibrate the transfer-matrix. Here, the authors propose a method of transfer-matrix calibration for the MWC with digital expanded channels when the phases of the sinusoidal inputs are unknown. As the oblique elements of the MWC transfer-matrix are equal, the authors can estimate the unknown phases first. The authors then obtain the actual transfer-matrix by phase correction. Finally, the validity of this method is verified by simulation and hardware experiment. The system performance is measured by computing the signal-to-noise ratio and the mean-square error between the original and reconstructed signals.

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Channel gain mismatch and time delay calibration for modulated wideband converter‐based compressive sampling

Cited by 8 publications

References 13 publications

A method for delay estimation between channels of Analog to Information Converters

A method for delay estimation between channels of Analog to Information Converters

A Calibration Technique for Simultaneous Estimation of Actual Sensing Matrix Coefficients on Modulated Wideband Converters

Successive‐phase correction calibration method for modulated wideband converter system

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