Physical-Layer Modeling of UWB Interference Effects

Padgett, J.E.; Koshy, John C.; Triolo, Anthony

doi:10.21236/ada525522

Cited by 21 publications

(18 citation statements)

References 3 publications

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“…The peak amplitude of the pulse is one of the most important parameters for correlation detection. For standardization and comparison with existing users the power spectral density can be calculated using [1,3,18]:…”

Section: Power Estimationmentioning

confidence: 99%

Impulse Radio UWB Pulse Shaping for Cognitive Radio Applications

Urban

Grace

Pechač

2010

Wireless Pers Commun

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This paper introduces a method of shaping impulse radio Ultra Wideband (UWB) pulses in the context of using higher than normal power transmissions and cognitive radio to provide the ability for such systems to avoid interference with primary users in shared radio spectrum. Using multiple shaping frequencies and a standard Gaussian pulse shape, pulses are shaped in the time domain, according to the requirements of the frequency spectrum in use, and any limits on power spectral density. Simulation results are presented for an example scenario based on measured data, along with a more general approach applicable to a free spectrum scenario. We show that the introduced shaping technique ensures that up to 98.8% of capacity of the UWB bandwidth within the conventional spectrum mask can be achieved for a time scaling factor of 11 ns and shaping frequency of 30 MHz. Capacity well in excess of the 100% achievable with the spectral mask is possible when the transmit power is permitted to increase in areas of 'white space' spectrum.

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Section: Power Estimationmentioning

confidence: 99%

Impulse Radio UWB Pulse Shaping for Cognitive Radio Applications

Urban

Grace

Pechač

2010

Wireless Pers Commun

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“…Commercial devices are currently limited in power, restricting the operating range to about ten meters 4 . Further studies are being performed to quantify the interference risks of UWB to conventional platforms 5,6,7 . Prototype systems have been developed at Lawrence Livermore National Laboratory using an experimental license.…”

Section: Ultra-wideband Basicsmentioning

confidence: 99%

Ultra-wideband radar methods and techniques of medical sensing and imaging

et al. 2005

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Ultra-wideband radar holds great promise for a variety of medical applications. We have demonstrated the feasibility of using ultra-wideband sensors for detection of internal injuries, monitoring of respiratory and cardiac functions, and continuous non-contact imaging of the human body. Sensors are low-power, portable, and do not require physical contact with the patient. They are ideal for use by emergency responders to make rapid diagnosis and triage decisions. In the hospital, vital signs monitoring and imaging application could improve patient outcomes. In this paper we present an overview of ultra-wideband radar technology, discuss key design tradeoffs, and give examples of ongoing research in applying ultra-wideband technology to the medical field.

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“…This view is largely based on the assumption that if the UWB pulses arrive at a faster rate than the intermediate-frequency bandwidth of the victim receiver (which should effectively be the same as the signal bandwidth), that the power spectral density of the UWB interfering signal is essentially constant over the bandwidth of interest [10]. Applied to the forward link of a cdma2000 system, this implies that under certain conditions the frequency response of the UWB signal that is seen at the output of the final IF stage of the victim terminal can be modeled as an equivalent bandpass signal that is centered at the forward link's carrier frequency, having a post-receiver chain bandwidth of 1.25 MHz and an approximately frequency-independent response over the channel of interest.…”

Section: Uwb Emission Limits Over the Cdma2000 Pcs Forward Linkmentioning

confidence: 99%

Impact of ultrawideband on CDMA2000 forward link performance

Green

2004

SPIE Proceedings

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The future proliferation of UWB-enabled devices raises legitimate concerns for the impact of its use on the performance of incumbent radio systems. In this paper, we present analytical models that quantify the blocking probability and the increase in forward traffic channel power allocation in the presence of noise-like UWB interference. The cdma2000 forward link has a fixed maximum transmit power but can control the fraction of total forward link power allocated to each traffic channel. If a terminal experiences a loss in sensitivity due to the presence of UWB energy, the base station can raise its power allocation to compensate for these conditions, up to a limit. If, however, the conditions at the handset require more power than that which is allowed by the system, then the traffic channel is blocked. In this study, we consider system performance as a function of the UWB power spectral density and its separation from the victim cdma2000 1X terminal. Although further study is pending, our analysis generally shows that protection of the cdma2000 forward link for indoor reception requires the UWB indoor emission limit to at least be below 20 dB below the currently specified emission limit when there is a single radiating UWB source.

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Physical-Layer Modeling of UWB Interference Effects

Cited by 21 publications

References 3 publications

Impulse Radio UWB Pulse Shaping for Cognitive Radio Applications

Impulse Radio UWB Pulse Shaping for Cognitive Radio Applications

Ultra-wideband radar methods and techniques of medical sensing and imaging

Impact of ultrawideband on CDMA2000 forward link performance

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