Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-050509-200154

Document Typethesis
Author NameZhang, Boyang
TitleReal-Time Software-Defined-Radio Implementation of Time-Slotted Carrier Synchronization for Distributed Beamforming
DepartmentElectrical & Computer Engineering
  • 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/Defense2009-05-14
    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.

  • zhang.pdf

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