Patent ID: 6915464
Filing Date: 2005-07-05
Classification: H04L

Abstract:
1. In a communications system, a method for non-causal channel equalization using error statistics, the method comprising: receiving a non-return to zero (NRZ) data stream input encoded with forward error correction (FEC); establishing a plurality of thresholds to generate a first bit estimate, including: supplying the first bit estimate for comparison in response to distinguishing the NRZ data stream input at the first, second, and third thresholds; comparing the first bit estimate in the data stream to a second bit value received prior to a first bit; comparing the first bit estimate to a third bit value received subsequent to the first bit; in response to the comparisons, determining the value of the first bit; FEC decoding determined first bit values; and, using FEC error statistics to adjust the thresholds by evaluating a number of errors associated with different groups of three-bit sequences, where each sequence includes the second bit value, followed by the first (center) bit value, followed by the third bit value, and the error is in the first (center) bit value.