U Signal Propagation through Walls

Bezoušek, Pavel; Schejbal, Vladimír; Cermak, D.; Němec, Zdeněk; Hájek, Martin

doi:10.1615/telecomradeng.v67.i6.20

Cited by 2 publications

(6 citation statements)

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“…Several combinations of receiving and transmitting antennas and input signals have been calculated and compared (see [3] - [5]). It can be concluded that UWB radar output transmitted signals are formed both with transmitters and antennas.…”

Section: Discussionmentioning

confidence: 99%

“…Several cases of propagation through walls have been analyzed. Some of them can be found in [3] - [5].…”

Section: Propagation Through Wallsmentioning

confidence: 99%

“…Some of these results can only be shown here. The papers [3] - [5] mostly studies spectra and UWB signal propagation through walls. This paper is dealing with multipath effects in time domain signal representation.…”

Section: Introductionmentioning

confidence: 99%

“…pulses) should be considered. The effect of various antenna receiving and transmitting responses as well as UWB signals (pulses) are analyzed in [3] - [5]. Various combinations of signals, transmitting or receiving antennas (small and aperture antennas) and wall structures as well as multipath propagation have been calculated and compared.…”

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confidence: 99%

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Multipath Propagation Effects of UWB Radars

Schejbal

Cermak

Němec

et al. 2006

2006 International Conference on Microwaves, Radar &Amp; Wireless Communications

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The propagation of ultra wide band (UWB) signals is analyzed. The UWB radar output signals are formed both with transmitter and antenna. Moreover, they can be substantially affected due to electromagnetic wave propagation through walls and multipath effects. Multipath effects are analyzed and simulated numerically for various cases with several heights and distances. IntroductionThe UWB concept is very useful for radars and communications [1], [2]. UWB is defined by FCC as any radio technology having a spectrum that occupies a bandwidth greater than 20 percent of the center frequency or a bandwidth of at least 500 MHz. UWB radar output signals are formed both with transmitters and antennas. Therefore UWB antenna should be considered as an integral part of the whole system. A UWB engineer needs to be familiar with both the time domain and frequency domain, able to switch seamlessly from one domain to the other as the nature of problem demands. In many situations, harmonic functions offer a potentially misleading situation. For instance, any attempt to model an ideal step function using superposition of harmonic functions yields overshoot and ringing. Therefore, the utilization of Fourier transform (especially FFT, when aliasing can occur) should be considered very carefully. The output transmitted signal is usually formed according to UWB system requirements. That is why propagation analyses should be done for very wide frequency spectrum and simultaneously, the effect of various transmitted signal shapes (e.g. pulses) should be considered. The effect of various antenna receiving and transmitting responses as well as UWB signals (pulses) are analyzed in [3] - [5]. Various combinations of signals, transmitting or receiving antennas (small and aperture antennas) and wall structures as well as multipath propagation have been calculated and compared. Some of these results can only be shown here. The papers [3] -[5] mostly studies spectra and UWB signal propagation through walls. This paper is dealing with multipath effects in time domain signal representation.

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Section: Discussionmentioning

confidence: 99%

“…Several cases of propagation through walls have been analyzed. Some of them can be found in [3] - [5].…”

Section: Propagation Through Wallsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Multipath Propagation Effects of UWB Radars

Schejbal

Cermak

Němec

et al. 2006

2006 International Conference on Microwaves, Radar &Amp; Wireless Communications

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“…That approach allows consideration of various phenomena from viewpoint of electromagnetic interferences and susceptibility. Various cases have been studied such as small and aperture antennas [2] - [5] and traveling wave antennas, when a straight wire excited by a single traveling wave of current can be analyzed. That allows consideration of different cases such as two-wire transmission line radiation.…”

Section: Frequency Domain Measurementsmentioning

confidence: 99%

Through-wall propagation measurements

Pidanič

Cermak

Schejbal

2007

2007 19th International Conference on Applied Electromagnetics and Communications

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The propagation of signals for ultra wide band (UWB) systems is analyzed. Signals can be substantially affected due to electromagnetic wave propagation through walls or similar obstacles. New experimental results and numerical simulations for frequency band from 4 to 8 GHz are analyzed and compared. That is briefly compared with the time domain experiments, which have been performed using very short pulses. Experiments performed for frequency and time domains demonstrated that the numerical simulations, which are very fast, could be reliable, when suitable wall parameters are used. Some questions concerning electromagnetic compatibility (EMC) are briefly mentioned.

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U Signal Propagation through Walls

Cited by 2 publications

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Multipath Propagation Effects of UWB Radars

Multipath Propagation Effects of UWB Radars

Through-wall propagation measurements

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