Title page for ETD etd-010807-213448

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

Abstract
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.

Files
mcginley.pdf

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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
Abstract 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.
Files	mcginley.pdf