Decision-feedback equalizer with maximum-likelihood sequence estimation and associated methods

• Main Authors: WANG CHUN, LIN JIANQING, BLAKE ROY BAXTER
• Format: Patent
• Language: English
• Published: 16.03.2004
• Edition: 7
• Subjects: CONTROLLING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

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.