Implementation of Modulated Wideband Converter compressed sensing scheme based on COTS lowpass filter with amplitude and phase compensation for spectrum monitoring

Nguyen, Lap-Luat; Fiche, Anthony; Gautier, Roland; Canaff, Charles; Rădoi, Emanuel; Burel, Gilles

doi:10.1109/avss.2018.8639329

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The frequency response of the low-pass filter implemented on our acquisition board is shown in Figure 5 and its phase i n Figure 6 . Details on filter calibration can be found in one of our previous papers [ 30 ].…”

Section: Acquisition Device and System Parametersmentioning

confidence: 99%

A Modulated Wideband Converter Model Based on Linear Algebra and Its Application to Fast Calibration

Burel

Fiche

Gautier

2022

Sensors

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In the context of cognitive radio, smart cities and Internet-of-Things, the need for advanced radio spectrum monitoring becomes crucial. However, surveillance of a wide frequency band without using extremely expensive high sampling rate devices is a challenging task. The recent development of compressed sampling approaches offers a promising solution to these problems. In this context, the Modulated Wideband Converter (MWC), a blind sub-Nyquist sampling system, is probably the most realistic approach and was successfully validated in real-world conditions. The MWC can be realized with existing analog components, and there exist calibration methods that are able to integrate the imperfections of the mixers, filters and ADCs, hence allowing its use in the real world. The MWC underlying model is based on signal processing concepts such as filtering, modulation, Fourier series decomposition, oversampling and undersampling, spectrum aliasing, and so on, as well as in-flow data processing. In this paper, we develop an MWC model that is entirely based on linear algebra, matrix theory and block processing. We show that this approach has many interests: straightforward translation of mathematical equations into simple and efficient software programming, suppression of some constraints of the initial model, and providing a basis for the development of an extremely fast system calibration method. With a typical MWC acquisition device, we obtained a speed-up of the calibration computation time by a factor greater than 20 compared with a previous implementation.

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Section: Acquisition Device and System Parametersmentioning

confidence: 99%

A Modulated Wideband Converter Model Based on Linear Algebra and Its Application to Fast Calibration

Burel

Fiche

Gautier

2022

Sensors

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“…and false alarm rate P f = %((B d \Br)∩Br) 1−%Br , with B r the real subbands from input signal and B d the detected subbands. The method on estimating these performances was explained in [7]. The memoryless 1 to 4-bit mid-rise ADCs applying an optimal Gaussian source quantizing technique are firstly simulated in the MWC scheme (in Figure 1) with assumptions that the mixers and the lowpass filters are ideal.…”

Section: A Low-bit Memoryless Adcmentioning

confidence: 99%

“…In addition, to implement the analog compressed acquisition chain of the MWC, the impacts of each non-ideal component need to be evaluated independently. By assuming the other components ideally, in [7], it has been demonstrated that MWC can be implemented with non-ideal and commercial off-theshelf SXLP-36+ lowpass filter with little performance loss. This paper continually focuses on the implementation MWC system with non-ideal low-bit ADCs.…”

Section: Introductionmentioning

confidence: 99%

Low-Bit Quantization Methods for Modulated Wideband Converter Compressed Sensing

Tan

Nguyen

Fiche

et al. 2019

2019 IEEE Global Communications Conference (GLOBECOM)

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This paper studies the impacts of low-bit quantization to wideband signal reconstruction with a sub-Nyquist sampling scheme Modulated Wideband Converter (MWC). Several real types of analog-to-digital converters (ADCs) are firstly simulated to the MWC and their results on wideband signal reconstruction are compared based on the low-bit criterion of the ADCs. Assessing the wideband reconstruction performances, this study proposes a trade-off between the oversampling factor, the number of bits and the type of quantizer, which can achieve the performance of reconstruction as close as possible to the ideal reconstruction.

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“…Besides above advantages, the proposed method can also obtain the necessary measurement for the compensation filter in a single measurement while the previous methods require many measurements. While all the previous results are based on simulation due to the infeasibilities for the practical measurement setup [41]- [48], in this paper we will demonstrated the performance of the proposed method with the actual measurement results using the on-board implementation of the MWC system.…”

mentioning

confidence: 95%

“…This method also needs many measurements, which takes a long time to build the compensation filter. Another method that is usable for the advanced MWC (q > 1) is proposed in [47], [48]. However, these previous works have some drawbacks.…”

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confidence: 99%

High-Precision Sub-Nyquist Sampling System Based on Modulated Wideband Converter for Communication Device Testing

Byambadorj

Asami

Yamaguchi

et al. 2022

IEEE Trans. Circuits Syst. I

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This paper proposes a new method of constructing a compensation filter for the modulated wideband converter (MWC) system. The proposed method can be directly used in the MWC circuit without disconnecting any components. Furthermore, the non-ideal transfer characteristics of the real mixer output and the real ADC input are taken into account in the proposed compensation filter. The proposed method can be utilized in the advanced MWC that enables more flexibility in the design parameters of the MWC. This paper also demonstrates the reconstruction of the Bluetooth signal as a practical example for the evaluation of the reconstruction performance. The MWC successfully reconstructs the time-domain waveform of the signal based on the proposed compensation filter. Even in the case that the total effective number of channels in MWC is small as close to the necessary condition of the MWC, the error vector magnitude (EVM) was still under 1%, which is acceptable for Bluetooth device testing applications.

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Implementation of Modulated Wideband Converter compressed sensing scheme based on COTS lowpass filter with amplitude and phase compensation for spectrum monitoring

Cited by 7 publications

References 12 publications

A Modulated Wideband Converter Model Based on Linear Algebra and Its Application to Fast Calibration

A Modulated Wideband Converter Model Based on Linear Algebra and Its Application to Fast Calibration

Low-Bit Quantization Methods for Modulated Wideband Converter Compressed Sensing

High-Precision Sub-Nyquist Sampling System Based on Modulated Wideband Converter for Communication Device Testing

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