Document Type thesis Author Name McGinley, James W URN etd-010807-213448 Title Real-Time Software-Defined-Radio Implementation of a Two Source Distributed Beamformer Degree MS Department Electrical & Computer Engineering Advisors Donald R. Brown, Advisor Richard Vaz, Committee Member John McNeill, Committee Member Keywords software defined radio beamforming distributed beamformer Date of Presentation/Defense 2006-12-08 Availability unrestricted
This thesis describes a real-time software-defined-radio implementation of a two source distributed beamformer. The technique in this thesis can be used to synchronize the carriers of two single antenna wireless transmitters (i.e. ``sources") with independent local clocks so that their bandpass transmissions arrive in-phase at an intended receiver (i.e. ``destination"). Synchronization is achieved via: (i) an unmodulated beacon transmitted by the destination to the sources and (ii) a pair of secondary unmodulated beacons between the sources. No explicit channel state information is exchanged between the sources and/or the destination. Using this method, it is possible to realize a two-source distributed beamformer that provides a reduction in overall transmit energy and increased security due to the directionality of the transmitted signal. System characterization results are provided along with experimental results for both time-invariant and time-varying channels. The experimental results in this thesis confirm the theoretical predictions and also provide explicit guidelines for a real-time implementation of a two-source distributed beamforming system.
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