The Impact of Vehicular Antenna Placement on Polarization Diversity

Squires, Chris C.; Willink, T.J.

doi:10.1109/vetecf.2009.5379017

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…For very large separations between array elements or when directional or polarized elements are used, assumptions of homogeneous fading characteristics may not hold [8]. Similar heterogeneous fading characteristics may occur in vehicular-based MIMO systems operating in urban environments where the positions chosen to mount the array elements, along with the relative location of the mobile to the transmitter, will impact the number of multipath components received at each element, as well as their corresponding powers and directions of arrival [37].…”

Section: Channel Representationmentioning

confidence: 99%

Impact of Vehicular Array Position on Urban MIMO Channel Characteristics

Squires¹,

Willink²

2011

International Journal of Antennas and Propagation

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MIMO channel measurements have been performed in urban environments with antenna arrays positioned on the roof and sides of the measurement vehicle. Analysis of the data shows that the array's position on the vehicle, along with the location and orientation of the vehicle with respect to the transmitter, can have a considerable impact on the channel characteristics observed. Array elements on the vehicle's roof receive the same multipath components, and, therefore, have identically distributed channel responses. However, the characteristics of the multipath components observed at each side of the vehicle can differ significantly. Specifically, shadowing from the vehicle combined with the directionality of the side-mounted array elements affects the angular distribution and powers of the received multipath components, affecting the achievable diversity and channel capacity. This can have significant impact on system performance and should be considered when designing and analyzing vehicular-based signalling techniques.

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Section: Channel Representationmentioning

confidence: 99%

Impact of Vehicular Array Position on Urban MIMO Channel Characteristics

Squires¹,

Willink²

2011

International Journal of Antennas and Propagation

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“…placing antennas further apart. MIMO channel measurements suggest that spatial diversity is more relevant than polarization diversity on vehicles [10].…”

Section: Introductionmentioning

confidence: 99%

Automotive Antenna Roof for Cooperative Connected Driving

et al. 2019

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An automotive concept for vehicular communications is proposed that utilizes the potential of the roof area for antennas. Antennas are distributed in cavities and on shelves in the center and on the front and rear roof ends. The arrangement of antennas on the roof allows better radiation to the front and back of automobiles than shark-fins and single cavities. Combining several modules provides space for further antennas, sensors, and integrated front-ends, as well as better spatial separation for multiple-input multiple-output (MIMO) arrays beyond 5G, and cooperative connected and automated driving. A prototype was developed and built into a car chassis. The measured data were analyzed and evaluated in the view of coverage for vulnerable road users and on correlation for the MIMO.

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A Review of the Applications of Through-the-Earth (TTE) Communication Systems for Underground Mines

Ngwenyama,

Webber-Youngman

2024

Mining, Metallurgy & Exploration

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Underground mining accidents have the potential of leaving miners trapped in unknown and life-threatening locations for an extended period of time. The lives of the trapped and unaccounted-for miners are at risk and require emergency rescue. But, the primary tracking systems are highly susceptible to damage during accidents and are most likely to be defunct and inoperable post-accident. This prompted the need for a robust and reliable post-accident communication and locator system. Subsequently, the through-the-earth (TTE) communication systems were developed and tested in underground mines. Under ideal conditions, these systems are capable of post-accident full-duplex two-way voice, text, and data communication and fingerprint detection of the geolocations of the trapped miners. This is achieved through a wireless link established by the transmission of electromagnetic and seismic waves between surface and underground, even in challenged underground environments. Unlike the primary tracking systems, the TTE communication systems do not require extensive shaft-to-workplace backbone infrastructure. This has made the TTE systems to be less susceptible to damage and therefore suitable for post-accident communication. Instead, the Earth’s crust acts as the signal transmission medium which forms an uplink and downlink communication path. This is achieved by injecting an electric current into the ground using electrodes, by transmitting magnetic fields from a radiating loop antenna, or by inducing fingerprint geolocations using seismic waves. Range and data rates are the critical requirements for the effectiveness of these systems and are dependent on factors such as the antenna design, frequency, and rock properties. This study provides a review of the applications of the different types of TTE communication systems, their evolution, factors that affect them, and techniques for improving their efficiencies and capabilities. These systems present the mining industry with an opportunity to improve safety by providing post-accident communication and locating trapped miners as quickly as possible. This will improve their survival chances and ultimately reduce fatality rates in the mining industry.

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The Impact of Vehicular Antenna Placement on Polarization Diversity

Cited by 5 publications

References 10 publications

Impact of Vehicular Array Position on Urban MIMO Channel Characteristics

Impact of Vehicular Array Position on Urban MIMO Channel Characteristics

Automotive Antenna Roof for Cooperative Connected Driving

A Review of the Applications of Through-the-Earth (TTE) Communication Systems for Underground Mines

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