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:
May. 16, 1995
Filed:
Dec. 07, 1992
Georg Frank, Nurnberg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A mobile radio receiver for a digital radio transmission system includes a recognition arrangement (6) for searching a received digital signal for pulses (i) of a frequency correction burst which recurs with a predetermined frequency in the digital signal and for determining the pulse positions (t). A frequency estimation arrangement (7) derives estimates of the predetermined frequency. In order to improve the initial synchronization of the mobile radio receiver with a base station, the recognition arrangement includes an averaging circuit (14) which averages with weight factors (Us) the pulse positions (t) that have been determined in successive observation intervals, the weight factors (Us) being proportional to the individual pulse heights (U). The reliability of recognition of pulses which belong a frequency correction burst is improved by providing evaluation based on the number of pulses of amplitudes above a selected threshold level during a selected interval, and further evaluation based on a phase error quality of the frequency estimates of the predetermined frequency.