A Modified FFT Algorithm for Efficient Computation of Narrow Band Spectrum
Shantanu Majumdar, Sridhar Ramakrishnan, N. V. Nair, Sammy Chan, R Clifford, Satish S. Udpa · 2006
In many applications, we are interested in computing the energy contained in a narrow band of a bandpass signal given its bandwidth and carrier frequency. The technique implemented in this paper can be used to compute the Fourier transform (FT) in a narrow band without having to calculate the entire frequency spectrum. It uses the decimation in time method for computing the FFT, exploiting some of the symmetry properties of the transform technique