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:
Jul. 04, 2000
Filed:
Sep. 30, 1997
Leo G Dehner, Southlake, TX (US);
Slim Souissi, Fort Worth, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A digital sync signal (502) is transmitted (702) from K transmitters (206) of a cluster (402), followed by K fine tuning signals (506) during K time slots (510), each time slot assigned to a transmitter. Each fine tuning signal comprises a pair of tones (512) separated in frequency by a predetermined amount. A portable subscriber unit (122) receives (706) the sync signal and the fine tuning signals, and makes (708) a rough estimate of the beginning of the fine tuning signals from the sync signal and from knowledge about the time slots. The portable subscriber unit computes (710) for each time slot a 2M-point Fourier transform (FT) on a received signal including M fine tuning signals received during the time slot from a transmitter of the cluster and from M-1 corresponding transmitters of adjacent clusters (404). The portable subscriber unit then fine tunes (722) the rough estimate through FT calculations.