Sabharwal, Ashutosh2019-05-172019-05-172017-122017-12-01December 2Javed, Abeer. "ScaleSync: Scalable Multiple Antenna Phase Synchronization." (2017) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/105580">https://hdl.handle.net/1911/105580</a>.https://hdl.handle.net/1911/105580The benefits of antenna arrays and multi-user multiple-input-multiple-output (MU-MIMO) have elevated them to a central position in preliminary 5G discussions. The large sizes of these arrays enable fine resolution RF sensing via angle-of-arrival (AoA) techniques. While MU-MIMO does not require phase synchronization, AoA estimation does. Past methods addressing this prerequisite either suffer from error sources, scale poorly, or necessitate special transceivers. I circumvent these issues by proposing a wired daisy chain architecture that synchronizes multiple commercial-off-the-shelf (COTS) RF chains by adding off-chip hardware. This architecture achieves an order N (array size) reduction in connection path length compared to a centralized architecture, thus enabling system scalability. To test this scheme, I design hardware and add it to ArgosV2: a pre-existing multiple antenna experimental base station. Evaluations of this implementation characterize the performance of my architecture. I conclude by successfully capturing images in the form of AoA spectra.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.phase synchronizationlarge array5G base stationThesis2019-05-17