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:
Dec. 03, 2013
Filed:
Aug. 27, 2010
Brandon P. Hombs, Merrimack, NH (US);
John A. Tranquilli, Jr., Merrimack, NH (US);
Joseph A. Farkas, Merrimack, NH (US);
Leonard E. Russo, Nashua, NH (US);
Joshua D Niedzwiecki, Manchester, NH (US);
Brandon P. Hombs, Merrimack, NH (US);
John A. Tranquilli, Jr., Merrimack, NH (US);
Joseph A. Farkas, Merrimack, NH (US);
Leonard E. Russo, Nashua, NH (US);
Joshua D Niedzwiecki, Manchester, NH (US);
Collision Communications, Inc., Portsmouth, NH (US);
Abstract
A QR-RLS adaptive digital filter provides fast computation without excessive computational resources. 18-bit multipliers enhance speed, and a floating point inverse square root block adjusts dynamic range in 12-dB steps. A memory stores two P-matrix copies, one being delivered with rows shifted according to the clock speed so as to enhance pipeline processing. Embodiments reliably detect modulation schemes, demodulate strong signals by passing feedback bits between multiple stages, remove impulses due to lightening, etc, erase symbol estimates which exceed an error threshold, and add high frequency noise to avoid mathematical divergence caused by excessive S/N. A genetic method is provided for identifying asynchronous spreading codes with minimum correlations, whereby randomly selected candidates compete based on Frobenius norms of their correlations, the weakest being discarded and the process being iterated. A method is provided for selecting optimal filter sampling windows for simultaneously detected symbol streams having relative timing delays.