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dc.contributor.advisorArıkan, Erdal
dc.contributor.authorToygar, M. Şenol.
dc.date.accessioned2016-08-04T13:58:23Z
dc.date.available2016-08-04T13:58:23Z
dc.date.copyright1990
dc.date.issued1990
dc.identifier.urihttp://hdl.handle.net/11693/32149
dc.descriptionCataloged from PDF version of article.en_US
dc.description[Ankara]: The Department of Electrical and Electronics Engineering and the Institute of Engineering and Sciences of Bilkent Univ., 1990.en_US
dc.descriptionIncludes bibliographical references (p.50-51).en_US
dc.description.abstractIn this thesis, we consider direct detection photon channel with peak and average power constraints. This channel is modelled as a binary input discrete memoryless channel. We study the cutoff rate for different modulation formats on this channel since it is a measure of decoding complexity when sequential decoding is used and also, it gives an upper bound for the probability of error which decreases exponentially with the constraint length of convolutional code. Cutoff rates for the ensembles of fixed-composition and independent-letters codes along with ON-OFF keying are computed numerically and also some bounds are given. Cutoff rates versus signal-to-noise ratio or peak power are plotted for blocklengths of N=40,100 and for both ensembles. Comparison of cutoff rates for these two ensembles shows that for the direct detection photon channel the cutoff rate of fixed-composition ensemble is significantly greater than that of independent-letters ensemble for small values of signal-to-noise ratio and when the average power is a small fraction of peak power, say, 5-30%. In an uncoded system, for achieving a probability of error P(E)=(10 to the power -9), we should send 10 photons/slot with rate R=1 bit/slot, resulting in an efficiency of 0.1 bits/photon.However, using coding we can make probability of error arbitrarily small achieving an efficiency of 1 bit/photon. Also, some remarks on the implementation of fixed-composition trellis codes and on multi-level signalling instead of ON-OFF keying are given in conclusions.en_US
dc.description.statementofresponsibilityby Toygar, M. Şenol.en_US
dc.format.extentviii, 51 leaves.en_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectCutoff rateen_US
dc.subjectFixed-composition codesen_US
dc.subjectPhoton channelen_US
dc.subjectON-OFF keyingen_US
dc.subject.lccQA268 .T69 1990en_US
dc.subject.lcshCoding theory.en_US
dc.subject.lcshSignal processing--Digital techniques.en_US
dc.titleCutoff rate for fixed-composition on-off keying over direct detection photon channelsen_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreeM.S.en_US
dc.identifier.itemidBILKUTUPB003071


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