Patent ID: 7460618
Filing Date: 2008-12-02
Classification: H04L

Abstract:
1. In a method for determining a carrier frequency of a continuous phase modulation (“CPM”) waveform containing a binary data sequence comprising a pattern of a predetermined number (N) of first binary tones followed by N second binary tones, the pattern repeating a predetermined number of times, said method using a Fourier Transform (“FT”), the improvement comprising the steps of: performing a first FT of said CPM waveform to generate a first set of FT bins and a second FT of said CPM waveform to generate a second set of FT bins, wherein said second FT is contiguous with said first FT; determining a phase difference between phase values from a first FT bin of said first set of FT bins and a second FT bin of said second set of FT bins wherein said first FT bin and said second FT bin have the largest amplitudes in the first set and second set of FT bins, respectively; dividing said phase difference by the time duration of either said first FT or said second FT to determine a frequency offset; and determining the carrier frequency of said CPM waveform at least in part from said first FT and said second FT by adding said frequency offset to a frequency of the first or second FT bin having the largest amplitude.