Ranging Method for Navigation Based on High-Speed Frequency-Hopping Signal

Yuan, En; Qi, Wangdong; Liu, Peng; Li, Wei; Chen, Longliang

doi:10.1109/access.2017.2787801

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…Then, a frequency compensation circuit (FCC) to eliminate f offset is proposed to obtain the desired frequency exactly as shown in FIGURE 9. The FCC compensates the foffset by subtracting the same weight as the E(PRBS), 1 2 A+1 through two A-bit adders. Here, each adder inserts the PRBS into the A th FCW input and to subtract 1 from the (A + 1) th FCW input.…”

Section: Proposed Dithering Methodsmentioning

confidence: 99%

“…Among the various methods, direct digital frequency synthesis (DDFS) is one of the representative waveform generation technique having fast frequency switching, continuous phase switching, fine frequency resolution, large bandwidth, and excellent spectral purity. Owing to these advantages, the DDFS method has been used in a wide range of applications such as radar, military equipment, medical devices, and aircraft [1]- [3]. However, the DDFS method has the critical drawback in high power consumption, causing the difficulty of using it in portable (battery-powered) devices [4], [5].…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of Low Power and High SFDR Direct Digital Frequency Synthesizer

et al. 2020

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Due to the advantages of fast frequency shifting, continuous phase shifting, fine frequency resolution, large bandwidth, and excellent spectral purity, the direct digital frequency synthesis (DDFS) technique is attracting more attention than ever before. Although the DDFS suffer from high power consumption, recent researches on the development of the low power DDFS (LP-DDFS) increases the feasibility of applying the DDFS to portable devices. To further accelerate the use of LP-DDFS, a new LP-DDFS design to significantly improve power efficiency is proposed and analyzed in this paper. In the new design, the dominant spur by truncation errors causing performance degradation has been also thoroughly considered. Since the existing dithering techniques for the truncation error problems can cause the additional performance degradation due to the side effects such as frequency offset and SNDR deterioration, an enhanced dithering technique is also proposed in this paper. The proposed technique includes a frequency compensation circuit and thus minimizes the truncation errors in the LP-DDFS with the minimal additional power consumption and SNDR degradation. Both theoretical and experimental analysis are conducted to verify the proposed design, where a prototype chip is fabricated and measured. INDEX TERMS Direct digital frequency synthesizer (DDFS/DDS), dithering scheme, high spuriousfree dynamic range (SFDR), low power design, Phase accumulator (PACC), pseudo-random binary sequence (PRBS).

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Section: Proposed Dithering Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Low Power and High SFDR Direct Digital Frequency Synthesizer

et al. 2020

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“…Medium access control level [142][143][144][145][146] The FH technique is employed for mitigating the effects of the IPCs. The information obtained in all the available channels is used for increasing the ranging accuracy, which will result in the improvement of the localization accuracy.…”

Section: Mitigationmentioning

confidence: 99%

“…Since the MPCs are strongly dependent on the carrier frequency and the surroundings of the sensor nodes, the effects of MPCs can also be mitigated by using several carrier frequencies in a controlled manner. Recently, a fast frequency hopping (FH) technique has been employed not only for mitigating the effects of MPCs but also for reducing signal interference [142,144]. It has also been shown that, by increasing the number of subcarriers, the mitigation of the IPCs can be enhanced [146].…”

Section: ) Mitigation Of Multipath Componentsmentioning

confidence: 99%

Fundamental Limitations and State-of-the-art Solutions for Target Node Localization in WSNs

Najarro¹,

Song²,

Kim³

2021

Preprint

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With the advances in new technological trends and the reduction in prices of sensor nodes, wireless sensor networks (WSNs) and their applications are proliferating in several areas of our society such as healthcare, industry, farming, and housing. Accordingly, in recent years attention on localization has increased significantly since it is one of the main facets in any WSN. In a nutshell, localization is the process in which the position of any sensor node is retrieved by exploiting measurements from and between sensor nodes. Several techniques of localization have been proposed in the literature with different localization accuracy, complexity, and hence different applicability. The localization accuracy is limited by fundamental limitations, theoretical and practical, that restrict the localization accuracy regardless of the technique employed in the localization process. In this paper, we pay special attention to such fundamental limitations from the theoretical and practical points of view and provide a comprehensive review of the state-of-the-art solutions that deal with such limitations. Additionally, discussion on the theoretical and practical limitations together with their recent solutions, remaining challenges, and perspectives are presented.

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“…In phase-based ranging, the channel is measured between two devices (known as initiator and reflector) on a uniform frequency grid over the bandwidth of interest [7]. The measurements can be processed using fast Fourier transform (FFT) [8] to obtain the CIR, however, the ranging accuracy is not great in multipath environment due to limited resolution of the FFT [9]. Instead of FFT, super-resolution algorithms such as Multiple signal classification (MUSIC) can be used to improve the accuracy of ranging in multipath environments [10].…”

Section: Introductionmentioning

confidence: 99%

Phase-based Ranging in Narrowband Systems with Missing/Interfered Tones

Sheikh¹,

Romme²,

Govers³

et al. 2022

Preprint

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The growth in the number of low-cost narrow band radios such as Bluetooth low energy (BLE) enabled applications such as asset tracking, human behavior monitoring, and keyless entry. The accurate range estimation is a must in such applications. Phase-based ranging has recently gained momentum due to its high accuracy in multipath environment compared to traditional schemes such as ranging based on received signal strength. The phase-based ranging requires tone exchange on multiple frequencies on a uniformly sampled frequency grid. Such tone exchange may not be possible due to some missing tones, e.g., reserved advertisement channels. Furthermore, the IQ values at a given tone may be distorted by interference. In this paper, we proposed two phase-based ranging schemes which deal with the missing/interfered tones. We compare the performance and complexity of the proposed schemes using simulations, complexity analysis, and two measurement setups. In particular, we show that for small number of missing/interfered tones, the proposed system based on employing a trained neural network (NN) performs very close to a reference ranging system where there is no missing/interference tones. Interestingly, this high performance is at the cost of negligible additional computational complexity and up to 60.5 Kbytes of additional required memory compared to the reference system, making it an attractive solution for ranging using hardware-limited radios such as BLE.

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Ranging Method for Navigation Based on High-Speed Frequency-Hopping Signal

Cited by 10 publications

References 24 publications

Design and Analysis of Low Power and High SFDR Direct Digital Frequency Synthesizer

Design and Analysis of Low Power and High SFDR Direct Digital Frequency Synthesizer

Fundamental Limitations and State-of-the-art Solutions for Target Node Localization in WSNs

Phase-based Ranging in Narrowband Systems with Missing/Interfered Tones

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