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:
Feb. 28, 2006
Filed:
Apr. 14, 2000
Thomas J Endres, Pipersville, PA (US);
Samir N Hulyalkar, Plainsboro, NJ (US);
Christopher H Strolle, Glenside, PA (US);
Troy a Schaffer, Langhorne, PA (US);
Anand M Shah, Yardley, PA (US);
Thomas J Endres, Pipersville, PA (US);
Samir N Hulyalkar, Plainsboro, NJ (US);
Christopher H Strolle, Glenside, PA (US);
Troy A Schaffer, Langhorne, PA (US);
Anand M Shah, Yardley, PA (US);
ATI Technologies Inc., Ontario, CA;
Abstract
An equalizer for use in a communication receiver includes an infinite impulse response (IIR) feedback filter operated in acquisition and tracking feedback modes on a sample by sample basis to form a hybrid Decision Feedback Equalizer (DFE) architecture. In acquisition mode, soft decision samples from the filtered received signal are input to the IIR filter. In the tracking mode, hard decision samples from a slicer are input to the IIR filter. Acquisition and tracking operating modes are selected in accordance with a set of decision rules on a sample by sample basis based on the quality of the current hard decision. If the current hard decision is low quality, then the soft decision sample (acquisition mode) is used. If the current hard decision is high quality, then the hard decision sample (tracking mode) is used. In such manner, the DFE is operated in a hybrid mode, i.e., using both soft and hard decisions on a sample by sample basis. Furthermore, the decision rules that are responsive to signal reliability to select acquisition and tracking modes are adaptive.