Document Type thesis Author Name Zhang, Boyang URN etd-050509-200154 Title Real-Time Software-Defined-Radio Implementation of Time-Slotted Carrier Synchronization for Distributed Beamforming Degree MS Department Electrical & Computer Engineering Advisors Donald R. Brown III, Advisor John A. McNeill, Committee Member Andrew G. Klein, Committee Member Keywords distributed beamforming carrier synchronization software-defined-radio sensor networks wireless networks cooperative transmission virtual antenna arrays Date of Presentation/Defense 2009-05-14 Availability unrestricted
This thesis describes a real-time software-defined-radio implementation of the time-slotted round-trip carrier synchronization protocol in two-source and three-source communication systems. The techniques developed in this thesis can be used to synchronize the carriers of two or three single-antenna wireless transmitters with independent local oscillators so that their band-pass transmissions combine constructively at an intended receiver. Synchronization is achieved via the time-slotted transmission of (i) an unmodulated primary beacon from the destination to the sources and (ii) a series of secondary unmodulated beacons between the sources. Explicit channel state information is not exchanged between the sources and/or the destination. When synchronized, the single-antenna sources are able to cooperatively transmit as a distributed beamformer and achieve increased transmission range, reduced transmission energy, and/or increased security. The experimental results in this thesis confirm the theoretical predictions and also provide explicit guidelines for the real-time implementation of a carrier synchronization technique suitable for distributed transmit beamforming.
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