Patent ID: RE42538

Claim:
A method for synchronizing with a transmitted signal, said method comprising: receiving said transmitted signal, wherein said transmitted signal comprises a periodic information bearing point at an information rate and wherein an information period is the inverse of said information rate; sampling said received signal at sample points at a sampling rate greater than said information rate, wherein a sample period is the inverse of said sampling rate; filtering said sampled signal with a pulse-shaping filter; measuring a variable of said filtered signal at said sample points, wherein said variable is independent of information content in said received signal; determining the location of said information bearing point in said filtered signal based on said information content-independent variable; and synchronizing said filtered signal with said information bearing point, wherein said determining said location of said information bearing point comprises using a highest average energy point in said filtered signal as said information bearing point, and wherein said highest average energy point occurs between two of said sample points, and said determining said location of said information bearing point further comprises interpolating between sample points, and wherein said interpolating is performed using a quadratic equation fit on three of said sample points having three highest average energy values.