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. 08, 2003
Filed:
Jul. 20, 2001
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method of estimating the frequency at the receiving end for a packet transmission system, for estimating a carrier frequency error between received symbols (r ) and transmitted symbols (c ). An error function (H(&Dgr;{circumflex over (f)})) defined for minimizing a magnitude which is representative of an average distance between the received symbols compensated in phase (r′ ) and estimations of the received symbols affected by a frequency error estimation (ĉ e ) is computed. The estimations of the received symbols affected by the frequency error estimation are obtained by varying the frequency error (&Dgr;{circumflex over (f)}) in an acquisition interval ([−f , +f ]) for estimations of the transmitted symbol (ĉ ). The estimations of the transmitted, symbols (ĉ ) are obtained based on a threshold relating to the phase of the received symbol which is compensated in phase (r′ ), in the case of a modulation of the PSK type. For a modulation of the QPSK (Quadrature PSK), the threshold decision is based on the sign of the real and imaginary parts of the received, phase-compensated symbol (r′ ).