Inter-Symbol / Inter-Frame Interference in Time-Hopping Ultra Wideband Impulse Radio System

Deleuze, A.-L.; Ciblat, Philippe; Martret, Christophe J. Le

doi:10.1109/icu.2005.1570020

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…In [9], it has been remarked that, even in presence of large guard time interval, the variance of the interference term z 2 does not vanish. This residual interference is due to collision between pulses only shifted by a delay belonging to [−T w , T w ].…”

Section: System Modelmentioning

confidence: 98%

“…Actually, z 1 is the useful signal, and z 2 is the so-called interference [10], [9]. In [9], it has been remarked that, even in presence of large guard time interval, the variance of the interference term z 2 does not vanish.…”

Section: System Modelmentioning

confidence: 98%

“…represents either the so-called developed code in the context of Time-Hopping scheme (see, e.g., [12], [9]) or the usual code on the context of Direct Sequence scheme.…”

Section: System Modelmentioning

confidence: 99%

“…Nevertheless, even if the guard time is large enough, a residual interference may remain and degrade the performance [6], [9]. Indeed, when the path delay is less than the pulse duration, pulses associated with the same symbol can overlap and create the "residual interference", also called, "cross modulation interference".…”

Section: Introductionmentioning

confidence: 96%

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Rake Receiver Improvement for Residual Interference Cancellation in UWB Context

Deleuze

Martret

Ciblat³

2007

2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring

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In the context of PAM Time-Hopping/Direct Sequence Impulse Radio Ultra Wide Band (IR-UWB), a residual interference occurs at the output of the Rake Receiver when realistic multipath propagation channel is considered even if a large guard-time interval is used. As a consequence, the performance is limited and exhibits BER floor. In this paper, we explicitally explains what causes such a residual interference. Secondly, we propose a simple way to modify the Rake receiver in order to totally remove this residual interference. The results are illustrated by simulations that validate the proposed method.

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Section: System Modelmentioning

confidence: 98%

Section: System Modelmentioning

confidence: 98%

“…represents either the so-called developed code in the context of Time-Hopping scheme (see, e.g., [12], [9]) or the usual code on the context of Direct Sequence scheme.…”

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Rake Receiver Improvement for Residual Interference Cancellation in UWB Context

Deleuze

Martret

Ciblat³

2007

2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring

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“…Approximate analytical expressions for Signal to ISI power ratio was first derived in [12] for various UWB transmission formats over two paths channels. In [13], a closed-form expression of the ISI/IFI energy at the output of a rake receiver is stated by considering the IEEE 802. 15.3a statistical channel model [7] with one cluster.…”

Section: Introductionmentioning

confidence: 99%

A statistical analysis of multipath interference for impulse radio UWB systems

Stanciu¹,

Azou

Rădoi

et al. 2015

Journal of the Franklin Institute

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International audienceIn this paper, we develop a statistical characterization of the multipath interference in an Impulse Radio (IR)-UWB system, considering the standardized IEEE 802.15.4a channel model. In such systems, the chip length has to be carefully tuned as all the propagation paths located beyond this limit can cause interframe/intersymbol interferences (IFI/ISI). Our approach aims at computing the probability density function (PDF) of the power of all multipath components with delays larger than the chip time, so as to prevent such interferences. Exact analytical expressions are derived first for the probability that the chip length falls into a particular cluster of the multipath propagation model and for the statistics of the number of paths spread over several contiguous clusters. A power delay profile (PDP) approximation is then used to evaluate the total interference power as the problem appears to be mathematically intractable. Using the proposed closed-form expressions, and assuming minimal prior information on the channel state, a rapid update of the chip time value is enabled so as to control the signal to interference plus noise ratio

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Performance Evaluation of Non-prefiltering vs. Time Reversal Prefiltering in Distributed and Uncoordinated IR-UWB Ad-Hoc Networks

Caso

Nardis

et al. 2017

Mobile Netw Appl

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Time Reversal (TR) is a prefiltering scheme mostly analyzed in the context of centralized and synchronous IR-UWB networks, in order to leverage the trade-off between communication performance and device complexity, in particular in presence of multiuser interference. Several strong assumptions have been typically adopted in the analysis of TR, such as the absence of Inter-Symbol / Inter-Frame Interference (ISI/IFI) and multipath dispersion due to complex signal propagation. This work has the main goal of comparing the performance of TR-based systems with traditional non-prefiltered schemes, in the novel context of a distributed and uncoordinated IR-UWB network, under more realistic assumptions including the presence of ISI/IFI and multipath dispersion. Results show that, lack of power control and imperfect channel knowledge affect the performance of both non-prefiltered and TR systems; in these conditions, TR prefiltering still guarantees a performance improvement in sparse/low-loaded and overloaded network scenarios, while the opposite is true for less extreme scenarios, calling for the developement of an adaptive scheme that enables/disables TR prefiltering depending on network conditions

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Inter-Symbol / Inter-Frame Interference in Time-Hopping Ultra Wideband Impulse Radio System

Cited by 9 publications

References 13 publications

Rake Receiver Improvement for Residual Interference Cancellation in UWB Context

Rake Receiver Improvement for Residual Interference Cancellation in UWB Context

A statistical analysis of multipath interference for impulse radio UWB systems

Performance Evaluation of Non-prefiltering vs. Time Reversal Prefiltering in Distributed and Uncoordinated IR-UWB Ad-Hoc Networks

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