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Wireless Optical Communication Systems

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The use of optical free-space emissions to provide indoor wireless communications
has been studied extensively since the pioneering work of Gfeller
and Bapst in 1979 [1]. These studies have been invariably interdisciplinary involving
such far flung areas such as optics design‚ indoor propagation studies‚
electronics design‚ communications systems design among others. The focus
of this text is on the design of communications systems for indoor wireless
optical channels. Signalling techniques developed for wired fibre optic networks
are seldom efficient since they do not consider the bandwidth restricted
nature of the wireless optical channel. Additionally‚ the elegant design methodologies
developed for electrical channels are not directly applicable due to the
amplitude constraints of the optical intensity channel. This text is devoted to
presenting optical intensity signalling techniques which are spectrally efficient‚
i.e.‚ techniques which exploit careful pulse design or spatial degrees of freedom
to improve data rates on wireless optical channels.

The material presented here is complementary to both the comprehensive
work of Barry [2] and to the later book by Otte et al. [3] which focused primarily
on the design of the optical and electronic sub-systems for indoor wireless
optical links. The signalling studies performed in these works focused primarily
on the analysis of popular signalling techniques for optical intensity
channels and on the use of conventional electrical modulation techniques with
some minor modifications (e.g.‚ the addition of a bias). In this book‚ the design
of spectrally efficient signalling for wireless optical intensity channels is approached
in a fundamental manner. The goal is to extend the wealth of modem
design practices from electrical channels to optical intensity domain. Here we
discuss important topics such as the vector representation of optical intensity
signals‚ the design and capacity of signalling sets as well as the use of multiple
transmitter and receiver elements to improve spectral efficiency.
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