Regents of University of Mn

Barret J Brickner

Bernardo Rub

Jaekyun Moon

An information handling system, such as a magnetic disk drive, includes a data channel which has a method and apparatus for detecting binary symbols from a received signal occurring at high data rates. The data channel includes a detector that has two inputs. The detector has a first portion which determines a first estimate of a binary input. The second portion, operating in parallel with the first portion, determines two conditional estimates for a second binary input. The estimate for the second binary input is selected after the first estimate is determined. The first and second estimates for the first and second binary inputs are then output from the detector. Each of the first and second portions of the detector uses a three dimensional observation space with orthogonal coordinate axes. Each of three consecutive synchronous observation samples of the received signal corresponding unambiguously to an axis in the observation space. A decision feedback equalizer removes intersymbol interference terms associated with prior detector outputs. Each detector portion uses a plurality of linear classifiers to partition the observation space. The second and/or third sample of the equivalent channel response is constrained relative to the first for the purpose of simplifying the linear classifiers. Boolean logic functions to decide into which decision region of the observation space a sample maps into. Advantageously, the detector runs at a frequency that is half the frequency of the remaining portions of the read channel.

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Minneapolis, MN, United States of America

Barret J Brickner