Patent ID: 7339985
Filing Date: 2008-03-04
Classification: H04L

Abstract:
1. A method for analyzing digital signals, the method comprising: receiving a digital signal, wherein the digital signal encodes a plurality of binary symbols; sampling the digital signal to generate a plurality of samples that represent the digital signal; determining a plurality of zero crossings of the digital signal, wherein each of the plurality of zero crossings is determined by a respective first sample and a respective second sample, wherein the first sample immediately precedes the zero crossing, and wherein the second sample immediately follows the zero crossing; for each of the plurality of zero crossings, determining an error expression, wherein the error expression computes an error of an interpolated value from the first sample and the second sample as a function of an estimated symbol period T and an estimated offset τ of the digital signal, wherein τ denotes a preamble of the signal that precedes the plurality of symbols; determining values of T and τ based on said error expressions using a linear fit that minimizes a total error of values of said error expressions; and storing said determined values of T and τ, wherein said determined values of T and τ are usable in analyzing the digital signal.