On polarization adjusted convolutional codes over fading and additive white Gaussian noise channels

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buir.advisorDuman, Tolga Mete
dc.contributor.authorSeyedmasoumian Charandabi, Seyed Sadra
dc.date.accessioned2022-06-14T08:00:54Z
dc.date.available2022-06-14T08:00:54Z
dc.date.copyright2022-05
dc.date.issued2022-05
dc.date.submitted2022-06-13
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Master's): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2022.en_US
dc.descriptionIncludes bibliographical references (leaves 84-88).en_US
dc.description.abstractUltra-reliable and low-latency communications (URLLC), which focuses on delay sensitive applications and services, is one of the three main pillars of 5G New Radio (NR) network architecture. URLLC's physical layer design is challenging since it must meet two contradictory requirements: ultra-low latency and ultra-high reliability. Short packets are used to minimize latency but at the cost of a significant loss of coding gain. Alternatively, system bandwidth can be increased, which is not always practical, particularly for some URLLC applications in industrial control that use unlicensed spectrum. In order to improve reliability, we must utilize robust channel codes in conjunction with retransmission techniques. Therefore, the construction of block codes with short blocklengths (e.g., a thousand or less information bits) is receiving significant attention with emerging wireless communications applications. In this thesis, we review existing channel coding bounds with short blocklengths for both additive white Gaussian noise (AWGN) and block fading channels. Furthermore, we investigate the performances of tail-biting convolutional, polar, and polarization adjusted convolutional (PAC) codes. With the motivation of reducing the decoding complexity of PAC decoders, we implement an alternative sequential decoding algorithm, namely, creeper algorithm, and describe a simplified list decoding approach. We also conduct an investigation on the performance of PAC codes and channel coding limits for block fading channels. Furthermore, we derive a method for computing approximate weight distribution of PAC codes, which can be used for an accurate performance bound; and, employing this approximation, we design PAC codes utilizing simulated annealing for optimization of the rate profiles. The results show that the newly designed PAC code rate profiles offer superior performance.en_US
dc.description.provenanceSubmitted by Betül Özen (ozen@bilkent.edu.tr) on 2022-06-14T08:00:53Z No. of bitstreams: 1 B153370.pdf: 1186061 bytes, checksum: 64f4718476663ac4959049a0e72db7aa (MD5)en
dc.description.provenanceMade available in DSpace on 2022-06-14T08:00:54Z (GMT). No. of bitstreams: 1 B153370.pdf: 1186061 bytes, checksum: 64f4718476663ac4959049a0e72db7aa (MD5) Previous issue date: 2022-05en
dc.description.statementofresponsibilityby Seyed Sadra Seyedmasoumian Charandabien_US
dc.format.extent[xviii], 88 leaves : charts (color) ; 30 cm.en_US
dc.identifier.itemidB153370
dc.identifier.urihttp://hdl.handle.net/11693/90592
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectShort blocklength channel codesen_US
dc.subjectPolarization-adjusted convolutional codesen_US
dc.subjectWeight distributionen_US
dc.subjectUnion bounden_US
dc.subjectTail biting convolutional codesen_US
dc.subjectPolar codesen_US
dc.subjectRate profilesen_US
dc.titleOn polarization adjusted convolutional codes over fading and additive white Gaussian noise channelsen_US
dc.title.alternativeSönümlü ve eklemeli beyaz Gauss gürültü kanalları üzerinde polarzasyon ayarlı evrişimli kodlaren_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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