Detection of end of preamble in read channel without interpolation

摘要

A method and system for detecting an end of a preamble without interpolation. The method includes receiving information from a zero phase start module, the information including a target phase constraint, a polyant, and a zero phase start phase. The method also includes selecting two samples per preamble cycle of short filter outputs and long filter outputs based on the target phase constraint, the polyant, and the zero phase start phase. The method further includes decimating the short filter outputs and the long filter outputs such that the selected two samples for each of the filters per preamble cycle are output upon decimation. The method additionally includes performing a sign comparison on the corresponding short filter and long filter outputs after decimation, wherein a sign mismatch of the corresponding short filter and long filter outputs indicates an end of a preamble.

主权项

1. A method, comprising:
receiving a plurality of samples by a long filter and a short filter; performing short filter operations on the plurality of samples by the short filter; performing long filter operations on the plurality of samples by the long filter; receiving short filter outputs from the short filter; receiving long filter outputs from the long filter; receiving information from a zero phase start module, the information including a target phase constraint, a polyant, and a zero phase start phase; selecting two samples per preamble cycle of the short filter outputs and the long filter outputs based on the target phase constraint, the polyant, and the zero phase start phase; decimating the short filter outputs and the long filter outputs such that the selected two samples for each of the long filter and the short filer per preamble cycle are output upon decimation; and performing a sign comparison on the corresponding short filter and long filter outputs after decimation, wherein a sign mismatch of the corresponding short filter and long filter outputs indicates an end of a preamble.