Frame-based carrier frequency and phase recovery system and method
AssigneeViaSat, Inc.
InventorsWilliam Thesling, Fan Mo
Life of this patent
Estimating the term…
Abstract
Header information is used to facilitate coarse frequency and frame recovery. The coarse frequency and frame recovery is thereafter utilized to perform adaptive phase and frequency synchronization on a frame-by-frame basis. A digitized signal representative of a wireless signal may be received. A frame identifier in a physical layer header in the signal may be identified by correlating the digitized signal to one or more known frame identifiers. The identified frame identifier may be used to estimate a phase or frequency error.
Claims23
A machine-implemented method for phase and frequency recovery from an input signal in a frame-based communication system, comprising:
- identifying a frame identifier in a frame header of a frame, the frame identifier a subset of the frame header;
- minimizing a frequency error based on the frame identifier;
- generating, with a processing device, a first phase estimate for the frame identifier based on frame identifier and the minimized frequency error;
- generating, with the processing device, a second phase estimate for a remainder of the frame header based on the first phase estimate;
- and
- combining, with the processing device, the first and second phase estimates to generate a third phase estimate for the entirety of the frame header.
A communication terminal for phase and frequency recovery of an input signal in a frame-based communication system comprising an application specific integrated circuit (ASIC) that is configured to:
- identify a frame identifier in a frame header of a frame, the frame identifier a subset of the frame header;
- minimize a frequency error based on the frame identifier;
- generate a first phase estimate for the frame identifier based on frame identifier and the minimized frequency error;
- generate a second phase estimate for a remainder of the frame header based on the first phase estimate;
- and
- combine the first and second phase estimates to generate a third phase estimate for the entirety of the frame header.
A communication terminal for phase and frequency recovery of an input signal in a frame-based communication system, comprising:
- means for identifying a frame identifier in a frame header of a frame, the frame identifier a subset of the frame header;
- means for minimizing a frequency error based on the frame identifier;
- means for generating a first phase estimate for the frame identifier based on frame identifier and the minimized frequency error;
- means for generating a second phase estimate for a remainder of the frame header based on the first phase estimate;
- and
- means for combining the first and second phase estimates to generate a third phase estimate for the entirety of the frame header.
Dependencies are inferred from the claim text.