Adaptive pattern dependent noise prediction on a feed forward noise estimate

摘要

Various embodiments of the present invention provide systems and methods for processing data. As one example, a circuit is disclosed that includes a pre-detector that detects an estimated pattern in a digital input signal, and a summation element that subtracts the estimated pattern from the digital input signal to yield a noise estimate. The circuit further includes a data dependent noise prediction filter that is adaptively tuned to detect a noise pattern, and that filters the noise estimate to provide a filtered noise estimate.

主权项

1. A data decoding circuit, the circuit comprising:
a pre-detector operable to:
receive a digital input signal; andapply a data detection algorithm to the digital input signal without first subtracting a filtered noise estimate from the digital input signal to yield an estimated pattern in the digital input signal; a summation element operable to subtract the estimated pattern from the digital input signal to yield a noise estimate; and a data dependent noise prediction filter operable to:
filter the noise estimate and to provide the filtered noise estimate;subtract the filtered noise estimate from a derivative of the digital input signal to provide a noiseless data input;post-detect the noiseless data input to generate a detected output; andadaptively tune the data dependent noise prediction filter based at least in part on the derivative of the digital input signal and the detected output.