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:
Nov. 22, 2005
Filed:
Sep. 24, 2001
Steven L. White, Cedar Rapids, IA (US);
Joseph C. Whited, Marion, IA (US);
Thomas L. Tapp, Cedar Rapids, IA (US);
Rodney L. Mickelson, Cedar Rapids, IA (US);
Steven L. White, Cedar Rapids, IA (US);
Joseph C. Whited, Marion, IA (US);
Thomas L. Tapp, Cedar Rapids, IA (US);
Rodney L. Mickelson, Cedar Rapids, IA (US);
Rockwell Collins, Cedar Rapids, IA (US);
Abstract
A bandwidth efficient advanced modulation waveform modem using concatenated iterative turbo coding and continuous phase modulation is disclosed. A demodulator in the modem has a turbo decoder and a decision feedback carrier and time tracking algorithm to track a carrier and adjust timing. The decision feedback carrier and time tracking algorithm may use an APP decoder as a decision device to provide symbol decisions at a high error rate and low latency for a coded input data stream. A symbol phase estimator produces a symbol phase error estimate from the symbol decisions. An erasure decision function decides which symbol decisions are correct and which symbol decisions are erasures. A carrier tracking function receives the symbol phase error estimates when the symbol decisions are correct and receives erasure inputs when the symbol decisions are erasures to maintain carrier tracking.