Channel combining and splitting for cutoff rate improvement

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dc.citation.epage639en_US
dc.citation.issueNumber2en_US
dc.citation.spage628en_US
dc.citation.volumeNumber52en_US
dc.contributor.authorArikan, E.en_US
dc.date.accessioned2016-02-08T10:20:19Z
dc.date.available2016-02-08T10:20:19Z
dc.date.issued2006en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractThe cutoff rate R0(W) of a discrete memoryless channel (DMC) W is often used as a figure of merit alongside the channel capacity C(W). If a channel W is split into two possibly correlated subchannels W1, W2, the capacity function always satisfies C(W1) + C(W2) ≤ C(W), while there are examples for which R0(W1) + R0(W2) > R0(W). The fact that cutoff rate can be "created" by channel splitting was noticed by Massey in his study of an optical modulation system. This paper gives a general framework for achieving similar gains in the cutoff rate of arbitrary DMCs by methods of channel combining and splitting. The emphasis is on simple schemes that can be implemented in practice. We give several examples that achieve significant gains in cutoff rate at little extra system complexity. Theoretically, as the complexity grows without bound, the proposed framework is capable of boosting the cutoff rate of a channel to arbitrarily close to its capacity in a sense made precise in the paper. Apart from Massey's work, the methods studied here have elements in common with Forney's concatenated coding idea, a method by Pinsker for cutoff rate improvement, and certain coded-modulation techniques, namely, Ungerboeck's set-partitioning idea and Imai-Hirakawa multilevel coding; these connections are discussed in the paper.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:20:19Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2006en
dc.identifier.doi10.1109/TIT.2005.862081en_US
dc.identifier.eissn1557-9654
dc.identifier.issn0018-9448
dc.identifier.urihttp://hdl.handle.net/11693/23857
dc.language.isoEnglishen_US
dc.publisherInstitute of Electrical and Electronics Engineersen_US
dc.relation.isversionofhttp://doi.org/10.1109/TIT.2005.862081en_US
dc.source.titleIEEE Transactions on Information Theoryen_US
dc.subjectChannel combiningen_US
dc.subjectChannel splittingen_US
dc.subjectCoded modulationen_US
dc.subjectConcatenated codingen_US
dc.subjectCutoff rateen_US
dc.subjectError exponenten_US
dc.subjectMultilevel codingen_US
dc.subjectRandom-coding exponenten_US
dc.subjectReliability exponenten_US
dc.subjectSet partitioningen_US
dc.subjectSuccessive cancellation decodingen_US
dc.titleChannel combining and splitting for cutoff rate improvementen_US
dc.typeArticleen_US

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