Proceedings ArticleDOI
Optical wireless communication using digital pulse interval modulation
Andrew Hayes,Zabih Ghassemlooy,N.L. Seed +2 more
- Vol. 3532, pp 61-69
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TLDR
It is shown that, for a simple threshold detector based receiver, DPIM can out perform PPM in terms of bandwidth efficiency and power efficiency, by taking advantage of its inherent variable symbol duration.Abstract:
This paper presents a study of digital pulse interval modulation (DPIM) as a candidate modulation scheme for optical wireless communications. DPIM code characteristics are discussed and the theoretical error probability performance of DPIM is analyzed in terms of the packet error rate. Performance comparisons are made with the more established techniques of on-off keying and pulse position modulation (PPM). We show that, for a simple threshold detector based receiver, DPIM can out perform PPM in terms of bandwidth efficiency and power efficiency, by taking advantage of its inherent variable symbol duration. Practical results are given for an experimental system in the form of eye diagrams. The use of a coding scheme with a non-uniform symbol duration does have implications for system design, which are discussed in the paper.read more
Citations
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Proceedings ArticleDOI
A MIMO-ANN system for increasing data rates in organic visible light communications systems
Paul Anthony Haigh,Zabih Ghassemlooy,Ioannis Papakonstantinou,Francesco Tedde,Sandro Francesco Tedde,Oliver Hayden,Sujan Rajbhandari +6 more
TL;DR: In order to speed up date rates further, an artificial neural network (ANN) is implemented to classify the signal and correct the error induced by the matrix inversion at the receiver, allowing a gross bit rate of 1.8 Mb/s in the best case.
Journal ArticleDOI
FSO Detection Using Differential Signaling in Outdoor Correlated-Channels Condition
Mojtaba Mansour Abadi,Zabih Ghassemlooy,Mohammad-Ali Khalighi,Stanislav Zvanovec,Manav R. Bhatnagar +4 more
TL;DR: In this article, a detection technique based on differential signaling for outdoor free space optical communications is proposed, which does not suffer from the computational load compared with the conventional receivers, where adjusting dynamically the detection threshold level (either based on CSI knowledge, or by using pilots) leads to increased computational time and reduced link throughput.
Proceedings ArticleDOI
Optical wireless communication for underwater Wireless Sensor Networks: Hardware modules and circuits design and implementation
TL;DR: The here proposed work has the aim to pave the way for diffuse optical communication allowing to support optical communication in an Underwater Wireless Sensor Network of dense-deployed fixed nodes for specific application, such as monitoring and surveillance, for shallow, coastal and inland water in the case of moderate/limited area.
Indoor Optical Wireless Communication Systems - Part I: Review
TL;DR: The emergence of portable computing devices such as laptops, palmtops and personal digital assistants (PDAs) has fuelled the demand for mobile connectivity and hence, led to the development of wireless local area networks (LANs).
Journal ArticleDOI
Digital pulse interval modulation for IR communication systems a review
Zabih Ghassemlooy,Andrew Hayes +1 more
TL;DR: This paper presents a brief review of infrared communications systems, modulation techniques and in particular, a digital pulse modulation scheme known as digital pulse interval modulation (DPIM) for infrared (IR) communication systems employing intensity modulation with direct detection (IM/DD).
References
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Book
Wireless Infrared Communications
Joseph M. Kahn,John R. Barry +1 more
TL;DR: The use of infrared radiation as a medium for high-speed short-range wireless digital communication, and several modification formats, including on-off keying (OOK), pulse-position modulation (PPM), and subcarrier modulation, are discussed.
Journal ArticleDOI
Simulation of multipath impulse response for indoor wireless optical channels
TL;DR: A recursive method for evaluating the impulse response of an indoor free-space optical channel with Lambertian reflectors, which enables accurate analysis of the effects of multipath dispersion on high-speed indoor optical communication systems.
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Optical Communication Receiver Design
TL;DR: Optical communications system performance photodetection photodentectors receiver noise modelling receiver front-end design receiver performance analysis.
Journal ArticleDOI
Experimental characterization of non-directed indoor infrared channels
TL;DR: An analysis indicating why non-directed infrared channels using intensity modulation and direct detection do not exhibit multipath fading, and justifying their representation as linear, time-invariant systems is provided.
Journal ArticleDOI
Differential pulse-position modulation for power-efficient optical communication
Da-Shan Shiu,Joseph M. Kahn +1 more
TL;DR: It is shown that for a given bandwidth, DPPM requires significantly less average power than pulse position modulation (PPM), and the ISI penalties incurred by PPM and DPPM exhibit very similar dependencies upon the channel RMS delay spread.