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:
Jan. 21, 2003
Filed:
Dec. 17, 1998
Nortel Networks Limited, St-Laurent, CA;
Abstract
The present invention relates to a method and an apparatus for compensating a signal that has experienced fading distortion in a communication channel. The signal that can be a TDMA (Time Division Multiple Access) signal includes slots that carry data symbols. Non-uniformly spaced pilot symbols are also embedded in the slot structure. The receiver separates the incoming symbols stream in two parts namely a pilot symbols stream and data symbols stream. Since the transmitted pilot symbols are known, an estimate of the channel distortion on the pilot symbols locations can be computed. This estimate is then interpolated to provide an estimate of the fading distortion at the data symbols locations, thus allowing to compensate accurately for the fading distortion in the channel.