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.
Worcester Polytechnic Institute
Electrical & Computer Engineering
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Zhang, Boyang, "Real-Time Software-Defined-Radio Implementation of Time-Slotted Carrier Synchronization for Distributed Beamforming" (2009). Masters Theses (All Theses, All Years). 748.
distributed beamforming, carrier synchronization, software-defined-radio, sensor networks, wireless networks, cooperative transmission, virtual antenna arrays