Εργαστήριο Τηλεπικοινωνιών

Μόνιμο URI για αυτήν την κοινότηταhttps://dspace.library.tuc.gr/handle/123456789/93

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Channel coding and detection for increased range bistatic scatter radio
(Technical University of Crete, 2014) Alevizos Panagiotis; Αλεβιζος Παναγιωτης; Bletsas Aggelos; Μπλετσας Αγγελος; Karystinos Georgios; Καρυστινος Γεωργιος; Deligiannakis Antonios; Δεληγιαννακης Αντωνιος
Scatter radio, i.e communication by means of reflection, has emerged as a potential key-enabling technology for ultra low-cost, large-scale, ubiquitous sensor networking. This work jointly studies noncoherent detection and channel coding for scatter radio networks, with the ultimate goal to further extend communication range, compared to prior art. Specifically, this work focuses on frequency shift keying modulation (FSK) in bistatic scatter radio architectures, where carrier emitter is dislocated from the software defined radio receiver (SDR). FSK is ideal for the power limited regime and allows for simple, frequency division multiple access (FDMA) of simultaneously operating receiver-less sensors. A novel composite hypothesis testing decoding rule is derived for noncoherent channel-encoded FSK, in bistatic scatter radio architectures. Such decoding rule is evaluated with short block length channel codes; the latter offer ultra-low encoding complexity, and thus, they are appropriate for resource-constraint scatter radio sensors. Reed-Muller and BCH codes are studied, due to their strong algebraic structure. It is shown that the proposed decoding scheme achieves high diversity order through interleaving. Extensive simulations under Rician fading scenarios include the impact of carrier frequency offset estimation errors, channel coherence time and interleaving depth. Closed-form performance analysis is also provided. Theoretical analysis for maximum likelihood coherent detection and decoding in on-off keying modulation (OOK) is also presented. Furthermore, experimental measurements are conducted outdoors, with a commodity SDR reader and custom scatter radio sensor. Sensor-to-reader ranges up to 134 meters are experimentally demonstrated with omnidirectional antennas and 13 dBm (20 milliWatt) transmission power. Coded setup offered 10 additional meters range extension compared to the state-of-the-art uncoded noncoherent detection. As a result, this thesis provided a simple solution that could further leverage the adoption of scatter radio in large-scale, ultra low-cost wireless sensor networks
A software-defined implementation of an OFDM - adaptive OFDMA system using USRPs 1
(Πολυτεχνείο Κρήτης, 2014) Magounaki Theoni; Μαγουνακη Θεονη; Liavas Athanasios; Λιαβας Αθανασιος; Bletsas Aggelos; Μπλετσας Αγγελος; Karystinos Georgios; Καρυστινος Γεωργιος
Software-defined radio implementation of OFDM
(Πολυτεχνείο Κρήτης, 2014) Leonidakis Stylianos; Λεωνιδακης Στυλιανος; Liavas Athanasios; Λιαβας Αθανασιος; Bletsas Aggelos; Μπλετσας Αγγελος; Karystinos Georgios; Καρυστινος Γεωργιος
Wireless communications is by any measure the fastest growing segment of the communications industry. Cellular phones, Wireless Local Area Networks (WLANs), Smart Homes and telemedicine are some applications that make extensive use of wireless communications. Orthogonal Frequency Division Multiplexing (OFDM) is a modulation that has been applied to a wide variety of applications and is adopted in many recently standardized broadband communication systems. OFDM is an appealing technique for achieving high-bit-rate data transmision, due to its robustness against the multipath fading and Inter Symbol Interference. Since the OFDM transmission is vulnerable to time and frequency offsets, accurate estimation of these parameters is one of the most important tasks of the OFDM receiver. In this thesis, we implement a time synchronization algorithm based on correlation of two identical parts of an OFDM pilot symbol. In addition, knowledge of the channel in the transmitter is very useful for effective transmission and/or interference mitigation (especially in static environments). Thus, channel feedback is utilized throughout the experiments conducted for this thesis. The experiments were conducted on a software-defined-radio (SDR) testbed based on the Universal Software Radio Peripheral (USRP).
Synchronization and detection for Gen2 RFID signals
(Technical University of Crete, 2015) Bamiedakis-Pananos Michail; Μπαμιεδακης-Πανανος Μιχαηλ; Bletsas Aggelos; Μπλετσας Αγγελος; Karystinos Georgios; Καρυστινος Γεωργιος; Deligiannakis Antonios; Δεληγιαννακης Αντωνιος

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