Faculty Advisor or Committee Member

Donald R. Brown III, Advisor

Faculty Advisor or Committee Member

Andrew G. Klein, Committee Member

Faculty Advisor or Committee Member

John A. McNeill, Committee Member

Identifier

etd-050509-200154

Abstract

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.

Publisher

Worcester Polytechnic Institute

Degree Name

MS

Department

Electrical & Computer Engineering

Project Type

Thesis

Date Accepted

2009-05-05

Accessibility

Unrestricted

Subjects

distributed beamforming, carrier synchronization, software-defined-radio, sensor networks, wireless networks, cooperative transmission, virtual antenna arrays

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