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:
Jun. 22, 2004
Filed:
Jul. 27, 2000
Srihari Adireddy, Ithaca, NY (US);
Lang Tong, Ithaca, NY (US);
Cornell Research Foundation, Inc., Ithaca, NY (US);
Abstract
An apparatus for reducing a precursor ISI signal in a receiver that receives an incoming stream of symbols distorted by intersymbol interference (ISI) includes: 1) a first forward filter for receiving the incoming stream of distorted symbols and generating a first equalized output signal (Y′ ); 2) a first decision feedback equalizer (DFE) stage for receiving the Y′ signal and generating a first decided symbol sequence (Ŝ ), wherein the first DFE stage generates from Ŝ a first postcursor cancellation signal that reduces postcursor ISI in the Y′ signal and generates from the Y′ signal a first symbol estimate signal (v ) in which postcursor ISI is at least partially reduced; and 3) a second decision feedback equalizer (DFE) stage for receiving the Y′ signal and generating a second decided symbol sequence (Ŝ ), wherein the second DFE stage comprises a soft symbol estimator that receives the v signal and generates a soft decision sequence (Ŝ′ ) comprising decided symbols and zero output signals, and wherein the second DFE stage generates from Ŝ′ a precursor cancellation signal that reduces precursor ISI in the Y′ signal.