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oai:www.ideals.illinois.edu:2142/69359 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Chen, Chien-Chung 2014-12-15T19:05:18Z 2014-12-15T19:05:18Z 10000-01-01 1987 1987 The performance of direct and heterodyne detection optical intersatellite communication links are evaluated and compared. It is shown that the performance of optical links is very sensitive to the pointing and tracking errors at the transmitter and receiver. In the presence of random pointing and tracking errors, optimal antenna gains exist that will minimize the required transmitter power. In addition to limiting the antenna gains, random pointing and tracking errors also impose a power penalty in the link budget. This power penalty is between 1.6 to 3 dB for a direct detection QPPM link, and 3 to 5 dB for a heterodyne QFSK system. For heterodyne systems, the carrier phase noise presents another major factor of performance degradation that must be considered. In contrast, the loss due to synchronization error is small. The link budgets for direct and heterodyne detection systems are evaluated. It is shown that, for systems with large pointing and tracking errors, the link budget is dominated by the spatial tracking error, and the direct detection system shows a superior performance because it is less sensitive to the spatial tracking error. On the other hand, for systems with small pointing and tracking jitters, the antenna gains are in general limited by the launch cost, and suboptimal antenna gains are often used in practice. In which case, the heterodyne system has a slightly higher power margin because of the higher receiver sensitivity. Made available in DSpace on 2014-12-15T19:05:18Z (GMT). No. of bitstreams: 1 8721603.pdf: 7072368 bytes, checksum: e1ffb1edf313edc4c3005e2655f605d2 (MD5) Previous issue date: 1987 Embargo set by: Seth Robbins for item 69525 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 224 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1987. http://hdl.handle.net/2142/69359 (UMI)AAI8721603 Engineering, Electronics and Electrical Comparison of Direct and Heterodyne Detection Optical Intersatellite Communication Links text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.