Delta Modulation Technique for Improving the Sensitivity of Monobit Subsamplers in Radar and Coherent Receiver Applications

Rodenbeck, Christopher T.; Tracey, Keith J.; Barkley, Keith Richard; Duverneay, Brian B.

doi:10.1109/tmtt.2014.2332433

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…Typically, the system design chooses an ADC with the maximum available dynamic range that also satisfies constraints on sampling rate, power dissipation, and cost. In wideband applications however, it may be desirable to sample with fewer bits so as to increase the sample rate [77][78][79][80][81][82][83].…”

Section: Fewer-bit Sampling Of Wideband Signalsmentioning

confidence: 99%

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Vouras¹,

Mishra²,

Artusio‐Glimpse³

et al. 2022

Preprint

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Rapid developments in synthetic aperture (SA) systems, which generate a larger aperture with greater angular resolution than is inherently possible from the physical dimensions of a single sensor alone, are leading to novel research avenues in several signal processing applications. The SAs may either use a mechanical positioner to move an antenna through space or deploy a distributed network of sensors. With the advent of new hardware technologies, the SAs tend to be denser nowadays. The recent opening of higher frequency bands has led to wide SA bandwidths. In general, new techniques and setups are required to harness the potential of wide SAs in space and bandwidth. Herein, we provide a brief overview of emerging signal processing trends in such spatially and spectrally wideband SA systems. This guide is intended to aid newcomers in navigating the most critical issues in SA analysis and further supports the development of new theories in the field. In particular, we cover the theoretical framework and practical underpinnings of wideband SA radar, channel sounding, sonar, radiometry, and optical applications. Apart from the classical SA applications, we also discuss the quantum electric-field-sensing probes in SAs that are currently undergoing active research but remain at nascent stages of development.

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Section: Fewer-bit Sampling Of Wideband Signalsmentioning

confidence: 99%

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Vouras¹,

Mishra²,

Artusio‐Glimpse³

et al. 2022

Preprint

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“…Qualitatively, if the input noise is too small compared to a monobit ADC's total input-referred DC offset, only high input SNR can overcome the DC offset in order to reliably toggle the 1-bit quantization step. Fortunately, recent results have demonstrated robust cancellation approaches [9] mitigating the impact of DC offset in order to increase the practical applications and versatility of few bit RF receivers.…”

Section: Monobit Adcsmentioning

confidence: 99%

“…The ''dynamic range first'' approach is so common that many engineers are, in fact, surprised to learn about entire application spaces that operate using only a few -or even just one -ADC bit. Examples of specialized wireless systems based on few bit ADCs include global positioning system (GPS) receivers [3]- [6]; radio astronomy [7], [8]; pulse Doppler radar [9]- [14], noise radar [15], [16], and next generation automotive radar [17]; low power [18]- [22], ultrawideband [23], [24], and impulse [25]- [29] communi-FIGURE 1. Illustration of available ADC performance in terms of power consumption, sampling bandwidth (BW), and SNDR dynamic range for all ADCs published in [1] and [2] from 1997-2018.…”

Section: Introductionmentioning

confidence: 99%

“…cations; ultrawideband spectrum monitoring [30] and channel estimation [31], [32]; digital RF memory (DRFM) and electronic warfare (EW) receivers [33]- [39]; and even biological sensing and computation [40]- [43]. The motivations for restricting a receiver design to only a few bits can vary widely to include: maximizing sample rate [38], minimizing power dissipation [25], achieving insensitivity to clock jitter over long coherent integration times [9], [10], [44] and, perhaps most importantly, dramatically reducing digital processing throughput requirements in large scale systems [18], [45]- [77].…”

Section: Introductionmentioning

confidence: 99%

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When Less Is More$\ldots$ Few Bit ADCs in RF Systems

Rodenbeck¹,

Martinez

Beun³

et al. 2019

IEEE Access

Self Cite

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Digitizing RF signals using few bit ADCs can provide system advantages in terms of reduced power dissipation, wider sampling bandwidth, and decreased demand for digital throughput. The diversity of established applications based on few bit ADCs, together with the recent surge of interest in the topic for 5G wireless communications and millimeter-wave radar, has created a need for practical design guidance governing their use in general RF systems. This paper, therefore, summarizes the state-of-the-art in few bit ADCs, comparing the dynamic range considerations involved with those of conventional RF receiver design. A simple analytic model for the monobit ADC is extended to multiple bits. Parametric analysis, independent of sampling considerations and system-specific signal processing, is used to illustrate the variation in the ADC output signal-to-noise-and-distortion ratio (SNDR) versus both the number of quantization bits and the input signal-to-noise ratio (SNR). At low and negative input SNR, increasing ADC resolution beyond 3-4 bits yields little advantage in output SNDR. Experiment confirms analytic predictions for the specific conditions under which the loss of signal fidelity due to quantization can be made negligible. In addition, parametric analysis of two-tone intermodulation distortion shows clear disadvantages to quantizing with <4 bits in the presence of strong blockers. The results reported in this paper, which are general and independent of system application, can be used to customize the number of ADC bits in an RF system based on system-specific performance requirements for receiver dynamic range. INDEX TERMS Analog-to-digital converters (ADCs), 5G, low resolution ADCs, quantization, coherent receivers, radiofrequency integrated circuits, wireless communications, radar.

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“…The high-resolution ADC leads to almost linear perfor-mance with low sampling rate, while wider bandwidth systems require higher sampling rate. For such requirements, the few-bit ADC, for example, with 1-3 bits [4][5][6] has been discussed in various applications, such as radar systems [7,8], mobile communications [9,10], and in particular, massive MIMO systems [5,6,[9][10][11]. The few-bit ADC in a RF front-end is capable of low power consumption, simple hardware structure, and higher sampling rates [3,4,12].…”

Section: Introductionmentioning

confidence: 99%

Noise-power estimation and performance improvement for SR-based receiver with few-bit ADC

Tatematsu

Hatano

Sanada

et al. 2023

NOLTA

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In broadband communication systems, an analog-to-digital converter (ADC) with few-bit quantization is a promising component in a RF front-end to ensure higher sampling rate. To mitigate the nonlinear behavior in the few-bit ADC, a stochastic resonance (SR), which improves a symbol error rate (SER) in the presence of the noise, has been focused. The SER degrades in a high signal-to-noise ratio (SNR) region. In this paper, we introduce the addition of the intentional noise in the SR-based receiver. To add the intentional noise appropriately, we propose simple estimation methods for the channel noise-power in the receiver with the few-bit ADC. To obtain the closed-form for a error function, we employ a sigmoid approximation. Numerical examples show that the proposed receiver can estimate the noise-power in a specific range of SNR. Low SER can be achieved for higher SNR by the addition of the intentional noise.

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Delta Modulation Technique for Improving the Sensitivity of Monobit Subsamplers in Radar and Coherent Receiver Applications

Cited by 9 publications

References 22 publications

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

When Less Is More$\ldots$ Few Bit ADCs in RF Systems

Noise-power estimation and performance improvement for SR-based receiver with few-bit ADC

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