IoT focused VHF and UHF propagation study and comparisons

Wright, Derek P.; Ball, Edward

doi:10.1049/mia2.12101

Cited by 4 publications

(5 citation statements)

References 16 publications

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“…Motivated by the newly available VHF spectrum, path-loss measurement studies have been conducted to compare VHF and UHF for IoT applications. Studies compare 70 with 869 MHz [59], and 37.8, 57.0 and 77.5 MHz from the VHF with 247.25, 312.0, and 370.0 MHz from the UHF [60]. In these studies log-distance plus shadowing path loss models have been fit to measurements in several environments, with varying antenna heights.…”

Section: B Mobile-to-mobile Propagationmentioning

confidence: 99%

Low Frequency Multi-Robot Networking

Sadler,

Dagefu,

Twigg

et al. 2024

IEEE Access

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Autonomous teams of unmanned ground and air vehicles rely on networking and distributed processing to collaborate as they jointly localize, explore, map, and learn in sometimes difficult and adverse conditions. Co-designed intelligent wireless networks are needed for these autonomous mobile agents for applications including disaster response, logistics and transportation, supplementing cellular networks, and agricultural and environmental monitoring. In this paper we describe recent progress on wireless networking and distributed processing for autonomous systems using a low frequency portion of the electromagnetic spectrum, here defined as roughly 25 to 100 MHz with corresponding wavelengths of 3 to 12 meters. This research is motivated by the desire to support autonomous systems operating in dense and cluttered environments by harnessing low frequency propagation, where meters long wavelengths yield significantly reduced scattering and enhanced penetration of obstacles and structures. This differs considerably from higher frequency propagation, requiring different low frequency propagation models than those widely employed for other bands. Progress in use of low frequency for autonomous systems has resulted from combined advances in low frequency propagation modeling, networking, antennas and electromagnetics, geolocation, multi-antenna array distributed beamforming, and mobile collaborative processing. This article describes the breadth and the depth of interaction between areas, leading to new tools and methods, especially in physically complex indoor/outdoor, dense urban, and other challenging scenarios. We bring together key results, models, measurements, and experiments that describe the state of the art for new uses of low frequency spectrum for multi-agent autonomy.

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Section: B Mobile-to-mobile Propagationmentioning

confidence: 99%

Low Frequency Multi-Robot Networking

Sadler,

Dagefu,

Twigg

et al. 2024

IEEE Access

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“…The loss model has to incorporate the distance and the antenna height as the variable. It is an established method to model path loss using the log-distance model [16] since signal loss varies as the logarithm of distance. Using the Matlab curve fitting tool, we considered different equations and selected those expressions having the least error compared to the F(50,50) loss variation for the different distances.…”

Section: A Path Loss Formulationmentioning

confidence: 99%

“…An empirical model like the Okumura-Hata model [3] remains relevant due to its computational efficiency and high accuracy [4], [5]. It is one of the widely referenced models in literature work.…”

Section: Introductionmentioning

confidence: 99%

“…Notwithstanding this, the VHF and UHF remain relevant, spurred by the emergence of diverse communication systems and intelligent devices. The VHF and UHF retain applications in maritime communication [11], machine-to-machine communication (M2M) [12], and the Internet of Things (IoT) [5]. Although limited in bandwidth, the Television (TV) band has a greater penetration power and coverage area compared to the mm-Wave.…”

Section: Introductionmentioning

confidence: 99%

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Simple VHF and UHF Propagation Loss Model

Jawhly

Tiwari

2023

IEEE Commun. Lett.

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Empirical propagation loss models play a crucial role in a wireless communication system with their costeffectiveness and simplicity. In this letter, we present a mathematical characterization of the Federal Communication Commission (FCC) F(50,50) curve for the Very High Frequency (VHF) and the Ultra High Frequency (UHF) band. The proposed empirical model is based on a novel step-wise curve fitting t he FCC signal strength data. The F(50,50) model is intended for the TV broadcasting system and has been employed effectively in different literary works. Following this, we proposed a simple mathematical expression applicable to a 100 km distance with antenna height ranging from 30 to 300 m. The results showed that the proposed mathematical formulation agreed well with the F(50,50) curve data. Furthermore, the model presented is straightforward and can readily be implemented in VHF and UHF signal loss calculation requiring minimal input parameters.

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“…Mobility, power and equipment cost issues limit their suitability in challenging use cases, where damage may result. In the past, novel propagation measurement systems using lower cost hardware have been described, such as for IoT applications in the VHF and UHF bands reporting path loss and delay spread [2], [3], [4].…”

Section: Introductionmentioning

confidence: 99%

A Portable 28-GHz Channel Sounder Platform and Measurement Results From Close-to-Ground Field Tests

Ball

Joseph

2023

IEEE Open J. Instrum. Meas.

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This article describes a novel, bespoke, and low-cost 28 GHz RF TX and RX front end design that has been combined with a commercial Software Defined Radio and Raspberry Pi controller to realize a portable propagation measurement system for the 28 GHz band. The complete sounder system can resolve an impulse from RX powers down to -107 dBm (3 dB impulse SNR) and the sounder TX can generate a signal of -8 dBm. Therefore, using 20 dBi antennas supports path loss measurements of 139 dB. The sounder can resolve time domain reflections to 33 ns in a channel measurement bandwidth of 60 MHz, producing both time domain and frequency domain results. The complete sounding system has been used to perform close-to-ground RF channel measurements, with propagation loss models and time domain impulses extracted. Close-to-ground measurement is an underreported area of propagation research that is relevant for novel use-cases, such as in military applications or for mobile device-to-device communications. A key initial finding from the trials is that the path losses for 28 GHz indoor and outdoor links at circa 70 cm above ground seem close to that of free space, with very few strong reflections with delays exceeding 33 ns.

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IoT focused VHF and UHF propagation study and comparisons

Cited by 4 publications

References 16 publications

Low Frequency Multi-Robot Networking

Low Frequency Multi-Robot Networking

Simple VHF and UHF Propagation Loss Model

A Portable 28-GHz Channel Sounder Platform and Measurement Results From Close-to-Ground Field Tests

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