Non-linear signal receiver

Abstract

A non-linear signal receiver. The non-linear signal receiver for detecting an original data ak from an input signal r(t) which is a binary data stream input through a channel or reproduced from data recorded on a storing device includes: an analog-to-digital converter (ADC) for sampling the input value according to sampling timing phases, and converting the sampled data into a digital signal rk; a modeling portion including 2N+1 taps Pn (n=−N, . . . , 0, . . . , N) each for selecting one of 2τ+ν tap values according to each pattern pn (bk−n+ν:k−n+1, bk−n−1:k−n−τ) of absolute values of the data transitions future ν bits and past τ bits, for estimating the channel characteristics of the sampled signal from the selected tap value and the data transition value; a timing recovery portion for controlling the sampling timing phase of the analog-to-digital converter using a phase gradient equal to p1(0)−p−1(0), which is the difference between values of respective taps positioned symmetrically around the tap P0 of the modeling portion; an equalizer for compensating for the deteriorated characteristics of the output value of the analog-to-digital converter; and a detector for converting the output of the equalizer to a digital value, to detect the original signal. Therefore, an accurate timing phase can be found using a model in which a non-linear channel of a high-density digital magnetic storing device is expressed by transition pulses selected according to the future ν bits and the past τ bits, thereby reducing timing jitter and bias.

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