The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 2025
Filed:
Jun. 21, 2022
Amazon Technologies, Inc., Seattle, WA (US);
Pengfei Xia, San Diego, CA (US);
Runhua Chen, Plano, TX (US);
Arunabha Ghosh, Bellevue, WA (US);
Timothy Leo Gallagher, Woodinville, WA (US);
AMAZON TECHNOLOGIES, INC., Seattle, WA (US);
Abstract
A satellite constellation provides communication between user terminals (UTs) and ground stations that connect to other networks. Grant-free transmissions allow the UTs access to the satellite uplink as needed. Each UT is assigned a unique preamble that represents a combination of repetition pattern (from a set of patterns) and precoding vectors (from a set of precoding vectors). The repetition pattern specifies two or more uplink slots to transmit the same data. The precoding vectors specify different phase angles for the respective uplink slots. The UT transmits a signal using the preamble, repetition pattern, and precoding vectors. The satellite receives these signals, and stores signal data representative of the signals, including repetitions. Overlapping signals from different UTs received during the same timeslot are separated using successive interference cancellation or a linear equalizer. The recovered signal may then be processed to recover data encoded therein.