Methods and apparatus for asynchronous sampling of a received signal at a downsampled rate

A system for asynchronous sampling of a received signal, comprising:

• at least one analog to digital converter configured to convert said received signal to a plurality of digital samples at a downsampled rate that is lower than a rate of said received signal;
• a plurality of parallel interpolation filters operating at said downsampled rate configured to interpolate said plurality of digital samples;
• a plurality of parallel data detectors to generate digital data, each of said parallel data detectors processing an output of a corresponding one of said parallel interpolation filters, and each of said parallel data detectors operating at said downsampled rate;
• at least one phase detector configured to generate an estimate of a timing error based on said digital data;
• and
• a digital loop filter configured to process said timing error estimates to generate an interpolation phase value that is applied to said parallel interpolation filters.

A system for asynchronous sampling of a received signal, comprising:

• means for converting said received signal to a plurality of digital samples at a downsampled rate that is lower than a rate of said received signal;
• means for interpolating said plurality of digital samples using a plurality of parallel interpolation filters operating at said downsampled rate;
• means for applying an output of each of said parallel interpolation filters to a corresponding data detector operating at said downsampled rate to generate digital data;
• means for generating an estimate of a timing error based on said digital data;
• and
• means for processing said timing error estimates to generate an interpolation phase value that is applied to said parallel interpolation filters.