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. 10, 1998
Filed:
Oct. 11, 1996
Kelly Davidson Hawkes, Los Altos, CA (US);
Corsair Communications, Inc., Palo Alto, CA (US);
Abstract
System for measurement of the bit period (or bit rate or baud rate or symbol rate) and bit epoch (or symbol epoch) of a digitally modulated signal by extracting a bit time-of-transition array, determining an emphasis array with individual elements thereof relating to corresponding elements of the bit time-of-transition array, and using linear regression on the bit time-of-transition array with the emphasis. The emphasis array is formed from the signal amplitude, signal to interference ratio, or probability of a bit not being in error. One of several matched filters is dynamically selected based on the data content of the signal and used to detect bit transitions. The system has application in time varying multi-path fading environments. The system operates on signals with low SNR, high co-channel interference, or high intersymbol interference. Useful in transmitter identification, range finding, mobile transmitter location, and frequency hop intercept systems.