Coding schemes for energy harvesting and multi-user communications

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buir.advisorDuman, Tolga Mete
dc.contributor.authorDabirnia, Mehdi
dc.date.accessioned2017-12-28T11:38:39Z
dc.date.available2017-12-28T11:38:39Z
dc.date.copyright2017-12
dc.date.issued2017-12
dc.date.submitted2017-12-27
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Ph.D.): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2017.en_US
dc.descriptionIncludes bibliographical references (leaves 139-152).en_US
dc.description.abstractMany wireless communication and networking applications can bene t from energy harvesting and wireless energy transfer including wireless sensor networks, radio frequency identi cation systems and wireless body networks. Some of the advantages that energy harvesting provides for such applications include energy self-su ciency, ability to implement them in hard-to-reach places, reducing the required battery size or even removing the battery completely from the wireless units. In such systems the required energy for the system operation is obtained from a renewable energy source such as solar, thermal or kinetic energy or from a man-made source such as radio frequency (RF) signals, arti cial light, etc. While there has been decades of designs and developments of energy harvesting nodes from circuit and device engineering perspectives, only recent studies consider the speci c constraints of these systems from a communications point of view, and signi cant challenges and problems still remain unsolved, particularly, at the physical layer. With the motivation of addressing some of the above challenges, our main focus in this thesis is the design and analysis of capacity approaching coding schemes for several energy harvesting and multiuser scenarios; in particular, by exploiting nonlinear codes concatenated with low-density parity-check (LDPC) codes for these scenarios. First, novel code design approaches are studied for the joint energy and information transfer speci cally, employment of nonlinear trellis codes (NLTCs) in serial concatenation with outer LDPC codes is proposed, and an algorithm is developed to design the NLTCs prior to optimizing the outer LDPC code using the EXIT analysis. The designed codes are shown to improve upon the o -the-shelf point-to-point (P2P) codes and outperform the alternative of utilizing linear codes with time switching and the reference scheme of concatenating LDPC codes with nonlinear memoryless mappers (NLMMs). This coding approach is then examined for the energy harvesting channel (EHC) implementing two decoding approaches at the receiver side wherein the rst one ignores the memory in the battery state, while the second one incorporates this memory into the trellis. Compared with the P2P codes and the reference schemes, the newly designed codes consistently o er better performance. This code design approach is explored for the case of discrete memoryless interference channels (DMICs) implementing the Han-Kobayashi (HK) encoding and decoding strategy as well. A stability condition is derived for the concatenated coding scheme and it is utilized in the process of designing the outer LDPC code employing the EXIT analysis. It is demonstrated that the designed codes achieve rate pairs close to the optimal boundary of the HK subregion and outperform the single user codes with time sharing. Furthermore, code design principles are also investigated for the two-user Gaussian interference channel with fading employing trellis-based codes with short block lengths. Finally, the problem of designing explicit and implementable codes is studied for a two-user interference channel with energy harvesting transmitters, and a design framework is proposed employing similar techniques developed for the DMIC and EHC.en_US
dc.description.degreePh.D.en_US
dc.description.statementofresponsibilityby Mehdi Dabirnia.en_US
dc.embargo.release2020-12-27
dc.format.extentxix, 152 leaves : charts ; 30 cmen_US
dc.identifier.itemidB157333
dc.identifier.urihttp://hdl.handle.net/11693/35709
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectEnergy harvesting communicationsen_US
dc.subjectJoint energy and information transferen_US
dc.subjectInterference channelen_US
dc.subjectChannels with memoryen_US
dc.subjectNonlinear trellis codesen_US
dc.subjectLowdensity parity-check codesen_US
dc.subjectSerially concatenated codesen_US
dc.subjectStability conditionen_US
dc.titleCoding schemes for energy harvesting and multi-user communicationsen_US
dc.title.alternativeEnerji hasadı yapılan ve çok-kullanıcılı haberleşme sistemleri için kodlama yöntemlerien_US
dc.typeThesisen_US

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