Patent ID: 6349120
Filing Date: 2002-02-19
Classification: H04L

Abstract:
A method for improving spectral sampling in a communication system using a Discrete Fourier Transform processor to detect a continuous wave burst with large initial spectral uncertainties, the method comprising the steps of:dividing all samples of the continuous wave burst into smaller sub-burst, each having a smaller number M of samples than the burst number N of samples, wherein M and N are positive integers; performing a Discrete Fourier Transform on each sub-burst, the Transform having a finite number of frequency bins, each representing a different band-pass filter, the Transform producing associated Transform data for each of the smaller sub-bursts; non-coherently combining each of the associated Transform data to produce a digital signal; receiving the continuous wave burst, the burst comprising the digital signal; digitizing the digital signal into N digital samples; selecting an optimal number L of sub-bursts based upon system performance including the N digital samples, data rates, estimated spectral and time uncertainty of the burst and desired detection performance at a minimum operating signal-to-noise ratio, wherein L is a positive integer and L is less than N; and determining the synchronicity and the spectral content of the burst based upon the optimal number L of sub-bursts.