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:
Aug. 17, 1999
Filed:
May. 13, 1998
Alan F Hendrickson, Austin, TX (US);
DSP Group, Inc., Santa Clara, CA (US);
Abstract
A method for configuring the receiver with an IF delay value that indicates the timing of symbol transitions in a received signal processed by the receiver. The receiver recovers a timing that has the same period as the symbol period, but which is out of phase with the received symbols. The received symbols are members of a constellation with elements that have purely I or purely Q components. A symbol-quality signal is generated by constructing the quantity .vertline..vertline.I.vertline.-.vertline.Q.vertline..vertline.. This quantity is a maximum when the detected symbols are aligned with the expected points in the symbol constellation, and decreases if the detected symbols are rotated away from these constellation points. The method determines an optimal delay value by which the symbol clock should be shifted from the recovered timing by using the symbol-quality signal to evaluate test delays and to successively refine them until the optimal delay value is found.