Journal ArticleDOI
Decoding with Stretched Pulses in Laser PPM Communications
G. Prati,R. Gagliardi +1 more
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TLDR
Several methods are considered for combating the pulse stretching, including pulse equalization, extended pulse integration, and pulse shape matching, and performance of these methods is compared for the case of exponential stretching and Gaussian statistics.Abstract:
The design and performance of optical PPM communication systems with ideal (rectangular) pulses have been well documented. However, many optical channels (fibers, atmosphere, clouds) are extremely dispersive to narrow pulses, producing receiver pulses that are spread (stretched) in time. This stretching produces interslot interference within a PPM frame, and if severe enough, can stretch over several frames (intersymbol interference). In this paper, laser pulse stretching in optical PPM formats is investigated in terms of performance degradation and decoder design alternatives. Several methods are considered for combating the pulse stretching, including pulse equalization, extended pulse integration, and pulse shape matching. Performance of these methods is compared for the case of exponential stretching and Gaussian statistics.read more
Citations
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Journal ArticleDOI
Decision-feedback equalization of pulse-position modulation on measured nondirected indoor infrared channels
TL;DR: This work examines the performance of two decision-feedback equalizers for pulse-position modulation on measured nondirected indoor infrared channels with intersymbol interference, and shows that a symbol-rate DFE provides performance that closely approaches that of the optimal MLSD.
Journal ArticleDOI
Differential PPM has a higher throughput than PPM for the band-limited and average-power-limited optical channel
TL;DR: The use of differential pulse position modulation (dPPM) as an alternative coding scheme to PPM is proposed and a simple scheme that decreases the throughput of the dPPM channel but is easy to analyze is chosen.
Posted Content
LiDAL: Light Detection and Localization
Aubida A. Al-Hameed,Safwan Hafeedh Younus,Ahmed Taha Hussein,Mohammed T. Alresheedi,Jaafar M. H. Elmirghani +4 more
TL;DR: This paper presents the first indoor light-based detection and localization system that builds on concepts from radio detection and ranging making use of the expected growth in the use and adoption of visible light communication (VLC), which can provide the infrastructure for the LiDAL system.
Proceedings ArticleDOI
Decision-feedback equalization of pulse-position modulation on measured non-directed indoor infrared channels
TL;DR: This work investigates suboptimal, reduced-complexity equalization techniques for PPM, providing a performance analysis of zero-forcing chip-rate and symbol-rate DFEs and shows that a symbol- rate DFE provides performance that closely approaches that of the optimal MLSD.
Dissertation
An investigation of an optical multiple pulse position modulation link over a dispersive optical channel
TL;DR: Digital Pulse Position Modulation, the subject of this thesis, offers the best sensitivity without the large bandwidth increase and a methodology of how to predict and generate an optimum or close to optimum mapping is suggested.
References
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The distribution of gains in uniformly multiplying avalanche photodiodes: Theory
TL;DR: In this paper, the authors derived the probability that a pulse initiated by n electrons in a uniformly multiplying semiconductor diode will result in a total number of electrons (or holes) m, to give a gain m/n, and for the probability Q n,m} that the gain will be m/m or greater.
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M-ary Poisson Detection and Optical Communications
R. Gagliardi,S. Karp +1 more
TL;DR: In this paper, the authors investigated the problem of maximum likelihood detection of one of M Poisson processes in a background of additive Poisson noise in a coherent M-ary optical communication system using photon counters in the presence of background radiation.
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