SUPERIMPOSED COMPOSITE CHANNEL FILTER

摘要

Methods and systems are provided to generate digital coefficients for a f ilter. The generation of coefficients relies on a Fourier transformation of an impulse response in time domain that is zero padded, e.g., zeros are appe nded to an array corresponding to a sampled input signal of length M. A unit prototypical filter is generated through a frequency domain response of len gth NFFT = Ns+M-1, wherein NS is a sampling length of the incoming signal. T he unit prototypical filter is then circularly shifted in order to generate a band pass filter centered at a desired frequency. Circularly shifted filte rs are point-to-point added to generate a set of composite digital coefficie nts to filter the incoming signal. The reference frequencies for the composi te filter are extracted from a message received from one or more base statio ns associated with one or more service providers. The composite filter typic ally operates on a frequency repeater.