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Wireless Optical Communication Systems
Description
WirelessOptical Communication Systems addresses the problem of designingefficient signaling and provides a link between the areas ofcommunication theory and modem design for amplitude constrainedlinear optical intensity channel. Topics include historicalperspective, channel impairments, amplitude constraints and thecharacteristics of popular optoelectronic components. A variety ofwireless optical channel topologies are presented along with a surveyand analysis of present day signalling techniques employed for thesechannels. The author provides a unifying framework for signallingdesign which allows the channel constraints to be representedgeometrically and permits the use of modem design principles fromelectrical channels. Modulation schemes are designed using theformalism of lattice codes and a design process for signalling setsis specified. The use of multiple-input/multiple-output (MIMO)wireless optical channels to improve the spectral efficiency of linksis explored. The basic spatio-temporal modem design problem isspecified and a spatial multiplexing gain is quantified. New spatialdiscrete multitone modulation is proposed and the unique features arediscussed. Based on measurements on an experimental prototype, achannel model is formulated and a realizable spatio-temporal codingscheme is simulated to quantify performance gains.
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