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:
Mar. 16, 2004
Filed:
Aug. 01, 2000
Roy Baxter Blake, Denville, NJ (US);
Jianqing Lin, Pleasanton, CA (US);
Chun Wang, Fremont, CA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A Decision-Feedback Equalizer (DFE) includes a Maximum Likelihood Sequence Estimator (MLSE) for estimating a symbol sequence. The DFE also includes a signal level decoder, and a delay line having a first plurality of taps being connected to the output of the signal level decoder, and a second plurality of taps being connected to the output of the MLSE. Furthermore, the DFE has an error signal generator having a first input connected to the input of the signal level decoder, and a second input connected to the output of the signal level decoder for adjusting coefficients of the taps. The symbol delay line has been split into two sections with the output of the MLSE being fed to part of the delay line. Because symbols in the delay line are adjusted with the coefficients and fedback to the signal level decoder, the output of the MLSE is able to correct symbols whenever its output is available. In such a symbol updating approach, error propagation in the delay line is avoided during an error event.