Patent ID: 8064552
Filing Date: 2011-11-22
Classification: G06F,H04B,H04L

Abstract:
1. A method for correlating samples of a received signal and samples of an internally generated or stored sample sequence, comprising: performing, by at least one electronic circuit, a first iteration of a low-resolution correlation, said low-resolution correlation including the steps of: selecting a first N sets of received signal samples from a received signal; selecting a first set of reference samples from an internally generated or stored sample sequence; concurrently comparing each of said first N sets of received signal samples with said first set of reference samples to determine if a sufficient correlation exists between the same, wherein a sufficient correlation exists when a correlation peak value associated with a respective one of said first N sets of received signal samples exceeds a pre-defined threshold value; performing a second iteration of said low-resolution correlation if it is determined that a sufficient correlation does not exist between said first N sets of received signal samples and said first set of reference samples; and performing, by at least one electronic circuit, a first iteration of a higher-resolution correlation if it is determined that a sufficient correlation exists between at least one of said first N sets of received signal samples and said first set of reference samples, and said higher-resolution correlation comprising obtaining a plurality of correlation values by comparing each of a second N sets of received signal samples with a second set of reference samples; wherein said first N sets of received signal samples and said first set of reference samples comprise the same number of samples, and each of said second N sets of received signal samples comprises a larger number of samples than each of said first N sets of received signal samples.