Enhancement of Time-Reversal Subwavelength Wireless Transmission Using Pulse Shaping

Ding, Shuai; Gupta, Shulabh; Zang, Rui; Zou, Lianfeng; Wang, Bing‐Zhong; Caloz, Christophe

doi:10.1109/tap.2015.2445414

Cited by 9 publications

(9 citation statements)

References 17 publications

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“…The term ∆τ ∆f is called Delay Swing-Bandwidth Product (DSBP), and Eq. (20) clearly states that the SIR is linearly proportional to DSBP. Note that the signal peak power (P S ) is proportional to ∆f 2 , the MAI average power (P X ) is proportional to ∆f {∆τ , increasing ∆f increases both P S and P X with P S increased faster, while increasing ∆τ decreases only P X , leading to the SIR linearly proportional to the DSBP.…”

Section: Delay Swing -Bandwidth Productmentioning

confidence: 95%

“…In Sec. III, we have derived the MAI power and SIR for the case of equal channel energy (α i,k " 1, @ k) based on the procedure from (17) to (20), so as to find the relationship between the DSBP (Delay Swing-Bandwidth Product) and SIR. We shall now extend this relationship to cover the case where the channels have different energies, i.e.…”

Section: B Mai Analysismentioning

confidence: 99%

“…A phaser transforms a UWB pulse into a time-spread version of it with spectral components rearranged in time. Practical phasers may be realized in various technologies, such as all-pass [14]- [16], coupled-resonator [17], [18], tapped delay line [19], [20], and electromagnetic band gap (EBG) [21] technologies. Many RR-ASP applications have already been reported, including real-time Fourier transformation [21], frequency sniffing [22], pulse compression, expansion and time-reversal [23], [24], frequency division multiplexing [25], signal-to-noise ratio enhancement [26], and uniform radiation scanning for antenna array [27], to name a few.…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Dispersion Code Multiple Access for High-Speed Wireless Communications

Zou

Gupta

Caloz

2018

IEEE Trans. Wireless Commun.

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Abstract-We model, demonstrate and characterize Dispersion Code Multiple Access (DCMA) and hence show the applicability of this purely analog and real-time multiple access scheme to high-speed wireless communications. We first mathematically describe DCMA and show the appropriateness of Chebyshev dispersion coding in this technology. We next provide an experimental proof-of-concept in a 2ˆ2 DCMA system. Finally, we statistically characterize DCMA in terms of bandwidth, dispersive group delay swing, system dimension and signal-tonoise ratio.

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Section: Delay Swing -Bandwidth Productmentioning

confidence: 95%

Section: B Mai Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Real-Time Dispersion Code Multiple Access for High-Speed Wireless Communications

Zou

Gupta

Caloz

2018

IEEE Trans. Wireless Commun.

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“…In (15), h(T − t) is a time-reversed version of h(t) for a time duration of T, which can approximately be expressed with the frequency domain terms by Parseval's relation. Substituting ( 11) -( 15) into (10), PRPR can consequently be represented as…”

Section: Peak Received Power Ratio Between Beamforming and Time Reversalmentioning

confidence: 99%

“…In addition, for mMIMO beamforming, the configuration and operation of the system could be quite complicated due to a large number of antennas used. One way to overcome such drawbacks of BF would be to employ time-reversal (TR) based far-field WPT [15]- [20]. TR applied in a complex propagation environment allows for spatial and temporal wave focusing by taking advantage of multipath, thereby selectively concentrating electromagnetic power at a desired location even with a single transmit antenna [20]- [26].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Time-Reversal Based Far-Field Wireless Power Transfer From Antenna Array in a Complex Environment

Park

Hong

2020

IEEE Access

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The performance of time-reversal (TR) based far-field wireless power transfer (WPT) from an antenna array in a complex propagation environment is investigated in comparison with conventional arraybased beamforming (BF). A two-step experiment is performed, namely 1) the propagation stage and 2) rectification stage. In the propagation stage, signal transmission is measured between the transmit array and receive antenna in an indoor multipath environment, for line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios. The results demonstrate that TR results in higher peak voltage compared to BF given the same average transmit power. In addition, while BF loses its ability to selectively send waves at the receiver due to impairment of the beam from multipath, TR can selectively focus waves at the receiver by inherently taking advantage of multipath. In the rectification stage, the resulting signals from the propagation stage are fed into a broadband rectifier for RF-to-DC conversion. It is shown that the signals received using TR lead to higher rectified DC voltage and rectification efficiency. The overall results suggest that TR can outperform BF with higher rectification efficiency given the same average transmit power. Through optimization of the TR pulse interval, array configuration and transmit power, further improvement in the performance of TR based WPT in a complex propagation environment is possible.INDEX TERMS Time-reversal, complex propagation environment, wireless power transfer, antenna array, beamforming, broadband rectifier, rectification efficiency.

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A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array

Park

Hong

2021

Sci Rep

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For far-field wireless power transfer (WPT) in a complex propagation environment, a time-reversal (TR) based WPT that can overcome the drawbacks of conventional beamforming (BF) by taking advantage of multipath has been recently proposed. However, due to the WPT performance of BF and TR depending on the complexity of the propagation environment, the performance prediction between BF versus TR would be required. We present a detailed and generalized analysis of the recently proposed performance metric referred to as the peak received power ratio (PRPR) for linear array-based WPT. Here, the effectiveness of PRPR is verified via measurement for free space and indoor scenarios. The results demonstrate that PRPR is directly related to the complexity of the propagation environment and the corresponding power transmission capability of BF and TR. That is, the higher the complexity, the greater the value of PRPR and TR outperforms BF with higher peak power given the same average transmit power and vice versa. The mode decision between BF and TR based on PRPR potentially promises efficient far-field WPT even in a dynamic propagation environment.

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Enhancement of Time-Reversal Subwavelength Wireless Transmission Using Pulse Shaping

Cited by 9 publications

References 17 publications

Real-Time Dispersion Code Multiple Access for High-Speed Wireless Communications

Real-Time Dispersion Code Multiple Access for High-Speed Wireless Communications

Investigation of Time-Reversal Based Far-Field Wireless Power Transfer From Antenna Array in a Complex Environment

A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array

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