FIELD: information technologies.
SUBSTANCE: generation of coefficients relies on Fourier transformation made on a pulse characteristic in a time area, which is complemented with zeros, for instance, zeros are added to an array that corresponds to a sampled input signal with M length. A single prototype filter is generated by a characteristic in a frequency area with length NFFT=M+Ns-1, in which NS is a length of incoming signal sampling. Then the single prototype filter is cyclically shifted to generate a band filter aligned at the required frequency. Cyclically shifted filters are added in a pointwise manner to generate a combination of composite digital coefficients in order to filter an incoming signal. Reference frequencies for a composite filter are extracted from a message received from one or more basic stations related to one or more services providers. The composite filter usually operates on a frequency repeater.
EFFECT: reduced destructive effects of a working characteristic.
26 cl, 18 dwg
