High sampling rate or high resolution in a sub-Nyquist sampling system

Zhao, Yijiu; Wang, Houjun; Zheng, Yanze; Zhuang, Yi; Zhou, Naixin

doi:10.1016/j.measurement.2020.108175

Cited by 8 publications

(6 citation statements)

References 35 publications

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“…There are several consequences produced if a big quantity of data is involved, such as trouble to find relevant information, burden to process signals with many coefficients and high power consumption, large resources for storage and transmission. Besides, technological limits impose that a high sampling frequency is necessarily counterbalanced by a low resolution [ 4 ]. Thus, sampling at a high frequency is not convenient from different points of view.…”

Section: Wideband Acquisition From Nyquist-shannon To Cs Paradigmmentioning

confidence: 99%

Over the Limits of Traditional Sampling: Advantages and Issues of AICs for Measurement Instrumentation

Iadarola

Daponte

Vito

et al. 2023

Sensors

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Data acquisition systems have shown the need of wideband spectrum monitoring for many years. This paper describes and discusses a recently proposed architecture aimed at acquiring efficiently wideband signals, named the Analog-to-Information Converter (AIC). AIC framework and working principle implementing the sub-Nyquist sampling are analyzed in general terms. Attention is specifically focused on the idea of exploiting the condition of the signals that, despite their large bandwidth, have a small information content in the frequency domain. However, as clarified in the paper, employing AICs in measurement instrumentation necessarily entails their characterization, through the analysis of their building blocks and the corresponding non-idealities, in order to improve the signal reconstruction.

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Section: Wideband Acquisition From Nyquist-shannon To Cs Paradigmmentioning

confidence: 99%

Over the Limits of Traditional Sampling: Advantages and Issues of AICs for Measurement Instrumentation

Iadarola

Daponte

Vito

et al. 2023

Sensors

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“…To set the TAP resolution to 40 ps, the REFCLK is supplied with a 390.625 MHz clock signal via the timing control block. Equation (7) gives the relationship between the tap resolution (TAP) and the REFCLK frequency (F REF ). 30 F I G U R E 9 Sampling process of received signal through FPGA platform.…”

Section: Fpga Implementation Of Delay Line Blockmentioning

confidence: 99%

“…In fact, such a chip is very expensive and its ideal resolution is typically low. 7 Fortunately, there is an alternative low-cost sampling method called equivalent-time sampling that can be adapted to through-the-wall imaging applications. This sampling method achieves high sampling resolution using a low-speed ADC.…”

Section: Introductionmentioning

confidence: 99%

An efficient FPGA‐based implementation of UWB radar system for through‐wall imaging

Saad

Maali

Azzaz

et al. 2023

Int J Communication

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Summary The work presented in this paper aims to develop a low‐cost ultra‐wideband (UWB) radar system that has the capability to image through the wall of a human target. The proposed radar system relies heavily on a field‐programmable gate array (FPGA) platform. The Xilinx FPGA Kintex‐7 (KC705) board is employed to integrate the main functionalities of the radar system, such as the generation and acquisition of a UWB signal. The generated signal is a monocycle signal, which has an ultra‐wide bandwidth. Due to the UWB nature of this signal, the radar system achieves better penetration ability, as well as high imaging resolution. However, the major challenge of a UWB radar system lies in the stage of digitization, as it requires a high sampling rate analog‐to‐digital converter (ADC). In fact, such a chip is very expensive. Hence, to reach a high sampling resolution using a low‐cost and low‐speed ADC, an efficient sampling strategy is implemented. In contrast to other UWB sampling methods, which require a hardware delay line chip, the new sampling scheme depends only on the FPGA firmware to realize a combination of real‐time and equivalent‐time sampling, which provides better jitter performance. Finally, to demonstrate the imaging capability, experimental tests are conducted in an indoor environment while human targets are located in different places. The measurement results revealed that the proposed radar system has the ability to provide 2D images that accurately determine the location of the target.

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“…Independent of architecture, the physical implementations of AIC suffer from the components imperfections and noise interference due to circuit design and fabrication [3,4], like any device that employs mixed-signal technologies, mainly when off-the-shelf (OTS) components are used. These problems can cause, for example, gain and offset errors [5] and loss of synchronization between the input signal and the AIC control signals [6], which compromises the measurement and consequently the signal reconstruction quality.…”

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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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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High sampling rate or high resolution in a sub-Nyquist sampling system

Cited by 8 publications

References 35 publications

Over the Limits of Traditional Sampling: Advantages and Issues of AICs for Measurement Instrumentation

Over the Limits of Traditional Sampling: Advantages and Issues of AICs for Measurement Instrumentation

An efficient FPGA‐based implementation of UWB radar system for through‐wall imaging

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

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