Field distributions within a rectangular cavity with vehicle-like features

Zhang, H.; Low, L.; Rigelsford, Jon; Langley, Richard

doi:10.1049/iet-smt:20080076

Cited by 10 publications

(2 citation statements)

References 2 publications

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“…First, we use the reverberation chamber to verify an important assumption, specifically that the time variation can be considered to be a WSSUS process. Secondly, in a metal cavity which has been verified to have vehicle-like properties [3], [11], this metal cavity was placed in a fully anechoic chamber that allowed us to perform tightly controlled measurements, having a very low noise floor (i.e., the anechoic chamber is shielded from external radiation, so only thermal noise is present). Finally, measurements were performed in an actual vehicle, which enabled us to measure the ground truth.…”

Section: Experimental Methodsmentioning

confidence: 99%

Characterizing the Spectral Properties and Time Variation of the In-Vehicle Wireless Communication Channel

Herbert

Wassell

Loh

et al. 2014

IEEE Trans. Commun.

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To deploy effective communication systems in vehicle cavities, it is critical to understand the time variation of the invehicle channel. Initially, rapid channel variation is addressed, which is characterized in the frequency domain as a Doppler spread. It is then shown that, for typical Doppler spreads, the in-vehicle channel is underspread, and therefore, the information capacity approaches the capacity achieved with perfect receiver channel state information in the infinite bandwidth limit. Measurements are performed for a number of channel variation scenarios (e.g., absorptive motion, reflective motion, one antenna moving, and both antennas moving) at a number of carrier frequencies and for a number of cavity loading scenarios. It is found that the Doppler spread increases with carrier frequency; however, the type of channel variation and loading appear to have little effect. Channel variation over a longer time period is also measured to characterize the slower channel variation. Channel variation is a function of the cavity occupant motion, which is difficult to model theoretically; therefore, an empirical model for the slow channel variation is proposed, which leads to an improved estimate of the channel state.

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Section: Experimental Methodsmentioning

confidence: 99%

Characterizing the Spectral Properties and Time Variation of the In-Vehicle Wireless Communication Channel

Herbert

Wassell

Loh

et al. 2014

IEEE Trans. Commun.

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“…Furthermore, ray tracing and CST Microwave Studio [9] simulations were undertaken for the vehicle-like cavity. The vehicle-like cavity used is that from the "SEFERE" project [10], [11]. It has been shown that the difference in terms of electromagnetic environment between the vehicle-like cavity and actual vehicles is minimal [12]- [14].…”

Section: Experimental Methodsmentioning

confidence: 99%

On the Analogy Between Vehicle and Vehicle-Like Cavities With Reverberation Chambers

Herbert

Loh

Wassell

et al. 2014

IEEE Trans. Antennas Propagat.

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Deploying wireless systems in vehicles is an area of current interest. Often, it is implicitly assumed that the electromagnetic environment in vehicle cavities is analogous to that in reverberation chambers, it is therefore important to assess to what extent this analogy is valid. Specifically, the cavity time constant, electromagnetic isolation and electric field uniformity are investigated for typical vehicle and vehicle-like cavities. It is found that the time constant is a global property of the cavity (i.e., it is the same for all links). This is important, as it means that the root-mean-square delay spread for any link is also a property of the cavity, and thus so is the coherence bandwidth. These properties could be exploited by wireless systems deployed in vehicles. It is also found that the field distribution is not homogeneous (and is therefore not uniform), but can be isotropic. For situations where the field distribution is isotropic, the spatial coherence is well defined, and therefore multiple-input-multiple-output antenna arrays can be used to improve performance of wireless systems. For situations where the field distribution is not isotropic, the angular spread is not uniform, and therefore beamforming can be used to improve performance of wireless systems.

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Vehicle Interaction with Electromagnetic Fields and Implications for Intelligent Transport Systems (ITS) Development

Low

Ruddle

Perallos

et al. 2015

Intelligent Transport Systems

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Field distributions within a rectangular cavity with vehicle-like features

Cited by 10 publications

References 2 publications

Characterizing the Spectral Properties and Time Variation of the In-Vehicle Wireless Communication Channel

Characterizing the Spectral Properties and Time Variation of the In-Vehicle Wireless Communication Channel

On the Analogy Between Vehicle and Vehicle-Like Cavities With Reverberation Chambers

Vehicle Interaction with Electromagnetic Fields and Implications for Intelligent Transport Systems (ITS) Development

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