Patent ID: 7590183
Filing Date: 2009-09-15
Classification: H04L

Abstract:
1. A method for generating a signal, the method comprising: selecting a first set of carrier frequencies that are integral multiples of a first frequency interval; selecting a second set of carrier frequencies that are integral multiples of a second frequency interval, where the second frequency interval is an integral multiple of the first frequency interval and the second set is a subset of the first set; for each of one or more signal carrier frequencies in the second set, generating the signal based on an inverse Fourier transform of the modulated waveform frequency components; wherein selecting the plurality of associated carrier frequencies in the first set comprises selecting carrier frequencies within a predetermined distance from the peak carrier frequency, where the number of carrier frequencies within the predetermined distance is fewer than the number of the waveform frequency components used in the inverse Fourier transform and large enough to prevent distortion in a corresponding carrier waveform from reducing a signal-to-noise ratio of the signal below a predetermined threshold, where the distortion is caused by deviation of the corresponding carrier waveform from a sinusoid.