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. 10, 2005
Filed:
Jul. 18, 2003
Eric Ojard, San Francisco, CA (US);
Alan Corry, Santa Clara, CA (US);
Eric Ojard, San Francisco, CA (US);
Alan Corry, Santa Clara, CA (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
A method and apparatus for obtaining a channel estimate and a baud frequency offset estimate for a communications channel in a communications system. The communications system has a transmitter for transmitting to a receiver over the communications channel signals representing data appended to a preamble signal. The preamble signal is provided as a periodic plurality of preamble sequences, each preamble sequence being generated in accordance with:A signal representing the periodic plurality of preamble sequences is sent by a transmitter over the communications channel to a receiver and is received at the receiver as a received signal. The received signal is processed to determine from the received signal both a channel estimate in accordance with:wherein B represents a matrix of preamble symbol values, upsampled by four and zero-filled, and yand yare column vectors of received samples, and a baud frequency offset estimate Δfin accordance with:wherein fis a baud frequency and fis a center frequency of the transmission signal.