{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/77440"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/77440","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"A noise-gated PLL for clock recovery in a free-space laser communication system","abstract":"In this thesis, I developed a phase-locked loop system for data clock recovery in a free-space laser communication application. The clock recovery unit is designed to operate at extremely low optical received power, tolerate a fading channel, and also account for Doppler effects. I explored the feasibility of adding a noise-gating system to the clock recovery unit in order to improve link margin in low-data-rate scenarios. 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