Synchronization in emerging wireless communication systems

dc.contributor.authorYao, Yuzhe
dc.contributor.supervisorDong, Xiaodai of Electrical and Computer Engineeringen_US of Philosophy Ph.D.en_US
dc.description.abstractSynchronization is one of the most important issues in wireless communication systems design and implementation. The requirement for synchronization is going high as the signal bandwidth and the system complexity increases. For instance, the ultra-short pulse width in ultra-wideband (UWB) communication systems poses problems to the conventional timing synchronization methods and the multi-node transmission poses problems to the existing carrier frequency offset (CFO) synchronization methods. Moreover, the impact of imperfect synchronization in these systems on the system performance is more negative than that of the conventional communication systems. Therefore, efficient synchronization algorithms are really in need. This dissertation presents several synchronization methods aiming to either improve the synchronization performance or reduce the synchronization complexity. The focus of this dissertation is on UWB systems and cooperative systems. Both timing synchronization and carrier frequency synchronization problems have been investigated. Several different systems are considered, including the point to point block transmission based UWB communications, orthogonal frequency division multiplexing (OFDM) based one way and two way relaying communication systems and narrow band cooperative communication systems. For block transmission UWB systems, i.e., both OFDM and single carrier frequency domain equalization (SC-FDE) UWB systems, a new generic timing estimation method based on channel impulse response (CIR) estimation is proposed. The newly proposed method is superior to the existing methods not only in synchronization performance, but also in the algorithm complexity. For the multi-node cooperative communications, the CFO mitigation issue is studied with OFDM signaling. Due to the distributed nature of the cooperative system, the multiple CFO problem is inevitable and hard to solve. A two-step compensation scheme is designed to suppress the interference introduced by multiple CFO with low complexity. Moreover, timing synchronization in cooperative communications is studied, including the broadband OFDM based cooperative communication and the narrow band cooperative communication. A means of determining the optimal timing of the OFDM signal in asynchronous two way relay networks (TWRN) has been designed. A correlation based multi-delay estimation method is proposed for narrow band asynchronous cooperative communication systems. The synchronization issues covering both timing and carrier synchronization have been extensively studied in this dissertation. New synchronization methods have been proposed for the emerging transmission schemes such as high rate UWB transmission and the distributed cooperative transmission with challenges different from conventional wireless transmission schemes.en_US
dc.identifier.bibliographicCitationY. Yao, X. Dong and N. Tin, "Design and Analysis of Timing Synchronization in Block Transmission UWB Systems ", Communications, IEEE Transactions on, Vol. 59, No.6, Jun. 2011en_US
dc.identifier.bibliographicCitationY. Yao and X. Dong, "On the Detection of Distributed STBC AF Cooperative OFDM Signal in the Presence of Multiple CFOs ", Communications (ICC), 2010 IEEE International Conference on, May 2010en_US
dc.identifier.bibliographicCitationY. Yao, X. Dong and N. Tin, "A New Joint Timing and Channel Estimation Method for Block Transmission UWB Systems ", Communications, 2009. ICC '09. IEEE International Conference on, Jun. 2009en_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectcooperative communicationsen_US
dc.titleSynchronization in emerging wireless communication systemsen_US


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