Correlation for Multi-Frequency Propagation in Urban Environments

Laethem, Benjamin Van; Quitin, François; Bellens, François; Oestges, Claude; Doncker, Philippe De

doi:10.2528/pierl11111701

Cited by 26 publications

(21 citation statements)

References 6 publications

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“…The univariate summary statistics, which are usually provided [6,16] for the individual frequency bands, are therefore not the summary statistics of the real incident signal, if the output of the PEMs is significantly confounded by crosstalk. Moreover, it is not unrealistic to assume that certain signals will be correlated anyway [19] , since they are frequently emitted from the same locations of base stations. This implies that, besides a correlation between data measured in the same frequency band; there will be a significant correlation between measurements in different frequency bands using PEMs, which means that the data are not univariate.…”

Section: Introductionmentioning

confidence: 99%

On-body calibration and processing for a combination of two radio-frequency personal exposimeters

Thielens

Agneessens

Verloock

et al. 2014

Radiation Protection Dosimetry

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Section: Introductionmentioning

confidence: 99%

On-body calibration and processing for a combination of two radio-frequency personal exposimeters

Thielens

Agneessens

Verloock

et al. 2014

Radiation Protection Dosimetry

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“…The optimum selection of the frequency of the system improves its performance [15][16][17]. This selection is most important for WCE applications, because the frequency-dependent, dielectric properties of the human body are highly hostile to the propagation of RF signals [18,19].…”

Section: Frequency Approachmentioning

confidence: 99%

A Novel, High-Speed Image Transmitter for Wireless Capsule Endoscopy

Basar¹,

Malek²,

Saleh³

et al. 2013

PIER

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Abstract-Wireless capsule endoscopy (WCE) was developed as a painless diagnostic tool for endoscopic examination of the gastrointestinal (GI) tract, but, to date, the low operating power of the capsule and the high data rate of the RF telemetry system are still key concerns. Innovative, novel solutions must be developed to address these concerns before WCE can be used extensively in clinical applications. In this paper, we propose a novel RF transmitter for WCE applications that only requires 1.5 V to transmit the required data as opposed to using a DC power supply. Our proposed, directconversion transmitter system consists of a current reuse oscillator, an envelope filter, and an L-section matching network. The oscillator is powered by the transmitting data which keep the oscillator in turned on and off for the transmitting 1 and 0 bit respectively and results in the on-off keying (OOK) of the modulated signal at the output of the oscillator. The rate of data transmission at the modulated signal is limited by the transient period of the oscillator start-up. When the start-up time of the oscillator is optimized, an OOK modulation rate of 100 Mb/s can be attained. In order to eliminate the oscillator decay noise, we used an envelope filter connected in series with the oscillator to filter out the decay part of the oscillation. Finally, the output impedance of the envelope filter is matched to the 50-Ω antenna with an L-section, low-pass, matching network to ensure maximum

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“…We also provide analytical cumulative distribution functions that can be used to approximate the diversity gains, providing an indication of improved coverage through the use of diversity. Work most closely related to ours may be that in [33]- [35]. In [34] and [35], only a single (tall) base station site was used for studying correlations across frequency, whereas in [33] multiple sites were used at a single frequency to study spatial correlation.…”

Section: Large-scale Site and Frequency Diversity Inmentioning

confidence: 99%

“…Work most closely related to ours may be that in [33]- [35]. In [34] and [35], only a single (tall) base station site was used for studying correlations across frequency, whereas in [33] multiple sites were used at a single frequency to study spatial correlation. Reference [34] used a frequency span slightly less than two and considered correlations of path loss and shadowing separately.…”

Section: Large-scale Site and Frequency Diversity Inmentioning

confidence: 99%

Large-Scale Site and Frequency Diversity in Urban Peer-to-Peer Channels for Six Public-Safety Frequency Bands

Matolak

Remley

Holloway

et al. 2014

IEEE Trans. Wireless Commun.

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Abstract-We report on peer-to-peer large-scale wireless channel characteristics for an urban environment in six public-safety bands, for five simultaneous receiving sites. Results are based upon measurements taken in Denver in July 2009 with stationary receivers and a pedestrian transmitter. The six frequencies at which we measured are (in MHz) 430, 750, 905, 1834, 2400, and 4860. We quantify both site and frequency diversity, and show that 5-site selection yields minimum average gains of 15 dB in mean received power levels; 5-site selection diversity also reduces received power variation by 17-29 dB, depending on frequency. Frequency diversity yields similar gains. By approximating received powers as lognormal, we describe an analytical method to approximate the cdf of the per-site, or per-frequency (or both) maximum received power. These data and diversity models should be useful for public-safety and ad hoc communication system designers, and for cooperative diversity schemes, wherein multiple users act as a virtual array.

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Correlation for Multi-Frequency Propagation in Urban Environments

Cited by 26 publications

References 6 publications

On-body calibration and processing for a combination of two radio-frequency personal exposimeters

On-body calibration and processing for a combination of two radio-frequency personal exposimeters

A Novel, High-Speed Image Transmitter for Wireless Capsule Endoscopy

Large-Scale Site and Frequency Diversity in Urban Peer-to-Peer Channels for Six Public-Safety Frequency Bands

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