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:
Apr. 08, 2003
Filed:
Jan. 12, 1999
Timothy M. Schmidl, Dallas, TX (US);
Donald C. Cox, Stanford, CA (US);
The Board of Trustees of the Leland Stanford Junior University, Stanford, CA (US);
Abstract
A method of determining an integral portion of a carrier offset &Dgr;f of an RF signal transmitted from a transmitter at a transmit carrier frequency f and an apparatus for carrying out the method. The signal consists of at least two data symbols S and S , each having a useful part preceded by a cyclic prefix containing a tail portion of the useful part, such that in the time domain the useful part occupies a symbol interval T and the cyclic prefix occupies a guard interval T . The carrier offset &Dgr;f between a receive carrier frequency f and the transmit carrier frequency f is calculated in the form of an integral multiple of the inverse 1/T of the symbol interval. The method is especially useful in application to data symbols which are multiplexed by the orthogonal frequency division multiplexing (OFDM) and are constructed from sub-symbols c belonging to a 2 -ary constellation of complex values equally spaced in phase, such as phase-shift keyed (PSK) constellations, e.g., BPSK, QPSK, DQPSK, 8-PSK, 8-DPSK, 16-PSK and 16-DPSK or amplitude and phase-shift keyed (APSK) constellations, e.g., 16-APSK, 16-DAPSK, 64-APSK and 64-DAPSK.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile