Statistics of the performance of time reversal in a lossy reverberating medium

Cozza, Andréa

doi:10.1103/physreve.80.056604

Cited by 27 publications

(31 citation statements)

References 11 publications

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“…Table I also demonstrates another interesting feature: time-reversal-driven RCs generate peak fields that are affected by a statistical dispersion by far lower than for a harmonic excitation. This feature is related to the self-averaging properties of time-reversal techniques, as already pointed out in [5] and [6].…”

Section: Resultsmentioning

confidence: 57%

Increasing peak-field generation efficiency of reverberation chamber

Cozza¹

2010

Electron. Lett.

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The use of time-reversal techniques has been shown to allow focusing energy in a spot about half a wavelength wide. The fact of being able to concentrate energy into a reduced volume of space implies higher power densities and, ultimately, higher field levels. The use of this feature for improving the ability of a reverberation chamber in converting energy into high-intensity fields is investigated here. Experimental results are compared to those predicted by a simple asymptotic model, revealing the role played by losses and frequency bandwidth and how the performance of time-reversal techniques depends on these parameters.

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Section: Resultsmentioning

confidence: 57%

Increasing peak-field generation efficiency of reverberation chamber

Cozza¹

2010

Electron. Lett.

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“…In order to assess the quality of the output signals generated by this kind of procedure, the mathematical analysis presented in this paper is developed within the framework introduced in [23], where each individual contribution b m (t) to the output signal is expressed as…”

Section: Trt : Coherent and Incoherent Contributionsmentioning

confidence: 99%

“…It is expected to hold with good precision as long as the number of degrees of freedom underlying the field distribution is much larger than one, as shown in [23]. This condition is not conservative, since it is required when time reversal is applied to complex media, as discussed in [20], [32].…”

Section: Theory Of Peak and Energy Contrastsmentioning

confidence: 99%

Multiple-Source Time-Reversal Transmissions in Random Media

Cozza

Monsef²

2014

IEEE Trans. Antennas Propagat.

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Abstract-The ability of time-reversed signals in reproducing a given time-dependence of the electromagnetic field within random media is investigated. A general setup consisting of multiple sources cooperating in providing the best transmission is considered, where the constructive interference of their individual contributions is meant to improve the quality of the field generation with respect to a single-source setup. The medium response is described by means of tools from random-process theory, for the case of stationary media complex enough to ensure a large number of multi-path contributions. It is shown that even a very weak spatial coherence in the medium is sufficient to significantly hinder the improvement expected from the use of multiple-source scenarios. Experimental results obtained in a reverberation chamber support the validity of the proposed theory. Direct applications of these results can be found in recent proposals about the potential benefits of time-reversed signals used in wireless communications, imaging techniques, as well as in pulsed-field generation devices based on energy compression through dispersive media.

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“…The stirrer has been used in order to provide different realizations of the chamber -for the present work fifty stirrer positions have been used. The heterogeneous media are well-known to be a proper environment for TR performance in terms of signal-to-noise ratio (SNR) [7]. The use of a reverberating chamber should consequently provide interesting performance in terms of focusing.…”

Section: Reverberation Chambermentioning

confidence: 99%