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Implementation of distributed Alamouti space time code in orthogonal frequency-division multiplexing (OFDM) system using USRP N200

Karamolegos Nikolaos

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URIhttp://purl.tuc.gr/dl/dias/E98324A7-4B9F-4924-B39E-204E52798785-
Identifierhttps://doi.org/10.26233/heallink.tuc.62379-
Languageen-
Extent2.2 megabytesen
TitleImplementation of distributed Alamouti space time code in orthogonal frequency-division multiplexing (OFDM) system using USRP N200en
TitleΥλοποίηση κατανεμημένου αλγορίθμου Alamouti σε OFDM σύστημα χρησιμοποιώντας USRP N200el
CreatorKaramolegos Nikolaosen
CreatorΚαραμολεγκος Νικολαοςel
Contributor [Thesis Supervisor]Liavas Athanasiosen
Contributor [Thesis Supervisor]Λιαβας Αθανασιοςel
Contributor [Committee Member]Paterakis Michalisen
Contributor [Committee Member]Πατερακης Μιχαληςel
Contributor [Committee Member]Karystinos Georgiosen
Contributor [Committee Member]Καρυστινος Γεωργιοςel
PublisherΠολυτεχνείο Κρήτηςel
PublisherTechnical University of Creteen
Academic UnitTechnical University of Crete::School of Electronic and Computer Engineeringen
Academic UnitΠολυτεχνείο Κρήτης::Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών Υπολογιστώνel
DescriptionΔιπλωματική εργασία που υποβλήθηκε στη σχολή ΗΜΜΥ του Πολυτεχνείου Κρήτης για την πλήρωση προϋποθέσεων λήψης του Διπλώματος Ηλεκτρονικού μηχανικού και μηχανικού ηλεκτρονικών Υπολογιστώνel
Content SummaryOrthogonal frequency division multiplexing (OFDM) is a modulation technique which is now used in most wired and wireless communication systems, because it is an effective solution to cope with intersymbol interference caused by the channel. In wireless communication, the concept of parallel transmission of symbols is used to achieve high throughput and better transmission quality. OFDM is one of the techniques for parallel transmission. OFDM splits the total transmission band- width into a number of orthogonal subcarriers in order to transmit the symbols using these subcarriers in parallel. It is a widely used modulation and multiplexing technology, which has become the basis of many telecommunications standards in- cluding 4G, wireless local area networks (LANs), digital terrestrial television (DTT) and digital radio broadcasting in much of the world. Multiple-input multiple-output (MIMO) technology significantly enhances sys- tem performance. The extra degrees of freedom afforded by the multiple antennas can be used for increasing bit rates through spatial multiplexing or for improved diversity order through space-time coding techniques. In this thesis, we combine OFDM and MIMO systems. Specifically, we design and implement an OFDM system with two transmitters and one receiver with Alamouti space time code (STC) using USRP. At the beginning, we create an OFDM transmitter and receiver with N subcarriers in Matlab and GNU radio and then we build it using C++ for real time processing. The two transmitters modify the data, as described, by Alamouti STC and they send them simultaneously. The receiver has to receive and process the data in order to detect the transmitted symbols. Time synchronization, CFO cancellation and channel estimation are such processes. The transmitters are two USRPs N200, which were synchronized to send the Alamouti symbols at the same time. Also, the receiver is a USRP N200. Before the Alamouti scheme, we implemented an OFDM system with one transmitter and one receiver. Finally, we measure some performance metrics, like SNR and BER. en
Type of ItemΔιπλωματική Εργασίαel
Type of ItemDiploma Worken
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-12-02-
Date of Publication2015-
SubjectOFDM systemsen
SubjectTelecommunication OFDMen
SubjectOrthogonal frequency division multiplexingen
SubjectOFDM in SDRen
Bibliographic CitationNikolaos Karamolegos, "Implementation of distributed Alamouti space time code in orthogonal frequency-division multiplexing (OFDM) system using USRP N200", Diploma Work, School of Electronic and Computer Engineering, Technical University of Crete, Chania, Greece, 2015en
Bibliographic CitationΝικόλαος Καραμολέγκος, "Υλοποίηση κατανεμημένου αλγορίθμου Alamouti σε OFDM σύστημα χρησιμοποιώντας USRP N200", Διπλωματική Εργασία, Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών Υπολογιστών, Πολυτεχνείο Κρήτης, Χανιά, Ελλάς, 2015el

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