2026-09-18T21:28:14Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1131522026-06-06T00:55:06Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
James Ward.
Griffin, Joseph C
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2018-01-12T21:00:08Z
2018-01-12T21:00:08Z
2017
2017
http://hdl.handle.net/1721.1/113152
1018306927
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (page 85).
Beamforming systems typically involve arrays of antenna elements with controllable spacing and little or no motion. However, a distributed beamforming system could leave array geometry and motion largely unconstrained. This work considers an airborne relay communication concept with multiple balloons in which the individual array elements act as relays to a receiver on the ground at a base station. The beamforming operation is performed at the receiver. The link between the relays and receiver suffers from a high bandwidth requirement. This thesis explores ways to reduce this bandwidth requirement by compressing the signals across the relays. A distributed compression algorithm is proposed and applied to both simulated and collected data. We conclude that a compression algorithm across the relays offers a substantial decrease in bit rate requirement, and that a preprocessing step can make the compression performance robust against differential delay and Doppler shifts across the array.
by Joseph C. Griffin.
M.Eng.
85 pages
eng
Massachusetts Institute of Technology
MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Exploring data compression for a distributed aerial relay application
Thesis
application/pdf
Publication
unknown
unknown
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<Abstract>Beamforming systems typically involve arrays of antenna elements with controllable spacing and little or no motion. However, a distributed beamforming system could leave array geometry and motion largely unconstrained. This work considers an airborne relay communication concept with multiple balloons in which the individual array elements act as relays to a receiver on the ground at a base station. The beamforming operation is performed at the receiver. The link between the relays and receiver suffers from a high bandwidth requirement. This thesis explores ways to reduce this bandwidth requirement by compressing the signals across the relays. A distributed compression algorithm is proposed and applied to both simulated and collected data. We conclude that a compression algorithm across the relays offers a substantial decrease in bit rate requirement, and that a preprocessing step can make the compression performance robust against differential delay and Doppler shifts across the array.</Abstract>
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