On the power spectral density of time-hopping impulse radio

Romme, Jac; Piazzo, Lorenzo

doi:10.1109/uwbst.2002.1006357

Cited by 58 publications

(31 citation statements)

References 5 publications

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“…Call the intensity of the point process, i.e., the average number of random points, or times, per unit of time. Then (3) Proof: The proof is sketched in Appendix. A more mathematically detailed proof can be found in [10].…”

Section: Shot Noise With Random Excitationmentioning

confidence: 99%

“…Among several contributions to spectral evaluation, we mention the computation of the power spectrum of a time-hopping, pulse position modulated signal [1]- [3], and that of the spectral density of the family of pulse interval modulated signals [4]. Such computations concern specific signal models and are performed using the classical wide-sense stationary (WSS) approach, i.e., as the Fourier transform of the correlation function.…”

Section: Introductionmentioning

confidence: 99%

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Ultrawide bandwidth signals as shot noise: a unifying approach

Ridolfi

Win

2006

IEEE J. Select. Areas Commun.

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Abstract-We present a shot noise based model for a large family of ultrawide bandwidth (UWB) signals. These include time-hopping and direct-sequence signaling with pulse position, interval, and amplitude modulations. Each specific signal is constructed by adding features to a basic model in a modular, simple, and tractable way. Our work unifies the contributions scattered in the literature and provides a general approach that allows various extensions of previous works as well as new results. The exact power spectrum is then evaluated using shot noise spectral theory, which provides a simpler, systematic, and rigorous approach to the spectra evaluation of complicated UWB signals. The strength of our methodology is that different features of the signal model contribute clearly and separately to the resulting spectral expressions.Index Terms-Point processes, power spectrum, pulse modulated signals, shot noise, ultrawide bandwidth.

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Section: Shot Noise With Random Excitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrawide bandwidth signals as shot noise: a unifying approach

Ridolfi

Win

2006

IEEE J. Select. Areas Commun.

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“…, 2 K − 1}. Then the power spectral density (PSD) of the transmitted bursty UWB signal is given by [10] …”

Section: System Model and Receiver Architecture A Transmitter Anmentioning

confidence: 99%

Compressed Sensing Reception of Bursty UWB Impulse Radio is Robust to Narrow-Band Interference

Oka

Lampe

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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Abstract-We have recently proposed a novel receiver for Ultra-Wide-band Impulse-Radio communication in bursty applications like Wireless Sensor Networks. The receiver, based on the principle of Compressed Sensing (CS), exploits the sparsity of the transmitted signal to achieve reliable demodulation. It acquires a modest number of projections of the received signal using analog correlators, and performs a joint decoding of the time of arrival and the data bits from these under-sampled measurements via an efficient quadratic program. In this paper we examine the robustness of this receiver to strong narrow-band interference (NBI) from primary licensed systems like WiMAX. First, by choosing frequency selective test functions in the front-end correlators, we ensure that the interferer can corrupt only a small fraction of the CS measurements. Then we implement a 'digital notch' by identifying and dropping those affected measurements during the quadratic programming reconstruction. The method is easily extended to multiple interferers without additional cost or complexity. We show that by implementing such a 'digital notch' the receiver becomes extremely robust to NBIs. For example its performance is negligibly affected even when the WiMAX customer premise equipment is at a distance comparable to that of the UWB transmitter and the base station is only ten times farther off, both very practical scenarios.

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“…Even in this case, the lines still remain about 20 dB above the continuous part of the spectrum (for 100Mbps data rate), and require a reduction of the total transmitted power of the signal by that amount. Uniform timing jitter, which is equivalent to considering a random position of the pulse within the frame, helps to smooth the spectrum but does not remove all spectral lines [15].…”

Section: Iic Psd Of Th-ir With Short Th Sequencementioning

confidence: 99%

“…[2] considered some fundamental properties of the spectrum of "classical" TH-IR, while [13] and [14] analyzed the impact of timing jitter on such systems. Piazzo and Romme analyzed the PSD further in [15] and suggested a way to control the spectrum by means of TH codes [16]. The use of polarity randomization for TH-IR was first suggested by us in 2003 [17].…”

Section: Introductionmentioning

confidence: 99%

Spectral shaping of UWB signals for time-hopping impulse radio

Nakache

Molisch

2006

IEEE J. Select. Areas Commun.

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This paper studies the design of signaling waveforms for time-hopping impulse radio (TH-IR) with limits on the power spectral density. Such restrictions are imposed by the spectral mask prescribed by frequency regulators for ultrawideband (UWB) signals. The "conventional" TH-IR system with pulse-position modulation and time-hopping multiple access gives rise to spectral lines that either violate the regulations, or require a significant power back-off. To remedy this situation, we propose the use of polarity randomization, which eliminates the spectral lines and also leads to a smoothing of the continuous part of the spectrum. We analyze different variants of the polarity randomization, considering short and long randomization sequences, as well as symbol-based or pulse-based randomization. We analyze the effect of this technique on both PPM and BPSK modulation. IEEE Journal on Selected Areas in CommunicationsThis work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved.

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On the power spectral density of time-hopping impulse radio

Cited by 58 publications

References 5 publications

Ultrawide bandwidth signals as shot noise: a unifying approach

Ultrawide bandwidth signals as shot noise: a unifying approach

Compressed Sensing Reception of Bursty UWB Impulse Radio is Robust to Narrow-Band Interference

Spectral shaping of UWB signals for time-hopping impulse radio

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