On the spectral estimation and synchronization of the cyclostationary optical fibre PPM process

Elmirghani, Jaafar M. H.; Cryan, R.A.; Clayton, F.M.

doi:10.1109/26.380132

Cited by 8 publications

(1 citation statement)

References 22 publications

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“…The analysis of the spectral properties of linear modulation formats and PPM (without time hopping) is well documented in the literature (e.g., [11], [12]). The study of the spectral properties of TH-IR combined with those modulation formats, however, is fairly recent.…”

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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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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Sensitivity evaluation of EDFA PPM systems under chromatic dispersion

Hussain

Elmirghani

Cryan

1996

Microw. Opt. Technol. Lett.

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I = 0 mm, 1 = 7.5 mm, and 1 = 12.5 mm). For a patch without slots, the current flows primarily in a straight line from one side to the other. From Figures 5(b) and 5k), it is clear that the presence of the slots forces the current to travel through a much longer path. This explains the decrease in the resonance frequency of the meander patch antenna. Also, it is evident from the figures that the patch length of the current flow increases with increasing slot length. This confirms the experimental observation of the reduction in the resonant frequency with an increase of the slot length. From the figures it is also clear that an increase in the slot width does not significantly increase the path length to the flow of the current. This validates the earlier results that the change in the slot width does not bring any significant change in the resonance frequency. CONCLUSIONThe design of a compact meander patch antenna has been presented. The length of the antenna is 70% less than that of a half-wave microstrip patch antenna. It is anticipated that this design will find application in hand-held communication systems where light weight and compactness are the most desirable criteria. Mbit/ s and h = 1.53 p m is analyzed, and is shown to offer a sensiticQ benefit of 9.2 dB oc,er an equiralent OOK system. Fiber chromatic dispersion is taken into account and is used to estimate the receiced pulse shape. Pulse dispersion can potentially induce a significant performance penalty in PPM system because of the temporal nature of the PPM format. Thr results show that for a transmitted pulse of duration 80 ps, the receiced pulses have full widths at half maximum (FWHM) of 160 and 320ps forfiber lengths equaling 120 and 240 km, respectiL,ely. The system sensitivity degradation due to dispersion is explicitly eilaluated. It is shown that a sensitivivpenal(y of up to 5 dB can be incurred over the transmission spans considered. 0 ABSTRACT An optically preamplified pulse position modulation (PPM) system operating at 622

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Analysis of PPM-Coded Modulated Signals

2024

Coding Theory in Optical Wireless Communication Systems

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On the spectral estimation and synchronization of the cyclostationary optical fibre PPM process

Cited by 8 publications

References 22 publications

Spectral shaping of UWB signals for time-hopping impulse radio

Spectral shaping of UWB signals for time-hopping impulse radio

Sensitivity evaluation of EDFA PPM systems under chromatic dispersion

Analysis of PPM-Coded Modulated Signals

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