US 6,633,616 C1 (12,947th)
OFDM pilot tone tracking for wireless LAN
James A. Crawford, San Diego, CA (US)
Filed by James A. Crawford, San Diego, CA (US)
Assigned to FLEET CONNECT SOLUTIONS LLC, Austin, TX (US)
Reexamination Request No. 90/019,796, Dec. 28, 2024.
Reexamination Certificate for Patent 6,633,616, issued Oct. 14, 2003, Appl. No. 09/935,081, Aug. 21, 2001.
Application 90/019,796 is a continuation in part of application No. 09/790,429, filed on Feb. 21, 2001, granted, now 6,549,583.
Ex Parte Reexamination Certificate issued on Jun. 25, 2025.
Int. Cl. H04K 1/10 (2006.01); H04J 11/00 (2006.01); H04L 27/26 (2006.01); H04L 27/00 (2006.01)
CPC H04L 27/2657 (2013.01) [H04L 27/2675 (2013.01); H04L 27/2679 (2013.01); H04L 2027/0067 (2013.01); H04L 2027/0087 (2013.01)]
OG exemplary drawing
AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT:
The patentability of claims 12-14 is confirmed.
Claims 1-11 and 15-29 were not reexamined.
12. A method of pilot phase error estimation in an orthogonal frequency division multiplexed (OFDM) receiver comprising:
determining pilot reference points corresponding to a plurality of pilots of an OFDM preamble waveform;
processing, in a parallel path to the determining step, the OFDM preamble waveform with a fast Fourier transform;
determining a phase error estimate of a subsequent OFDM symbol relative to the pilot reference points; and
processing, in the parallel path to the determining step, the subsequent OFDM symbol with the fast Fourier transform:
wherein the determining the phase error estimate step is completed prior to the completion of the processing the subsequent OFDM symbol with the fast Fourier transform in the parallel path.