Superimposed composite channel filter

Details Superimposed composite channel filter Superimposed composite channel filter

2011-03-15

2011-03-15

Qureshi, Afsar M. (Department: 2472)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S335000, C370S342000, C370S509000, C375S137000, C375S150000

Reexamination Certificate

active

07907513

ABSTRACT:
Methods and systems are provided to generate digital coefficients for a filter. The generation of coefficients relies on a Fourier transformation of an impulse response in time domain that is zero padded, e.g., zeros are appended to an array corresponding to a sampled input signal of length M. A unit prototypical filter is generated through a frequency domain response of length NFFT=NS+M−1, wherein NSis a sampling length of the incoming signal. The unit prototypical filter is then circularly shifted in order to generate a band pass filter centered at a desired frequency. Circularly shifted filters are point-to-point added to generate a set of composite digital coefficients to filter the incoming signal. The reference frequencies for the composite filter are extracted from a message received from one or more base stations associated with one or more service providers. The composite filter typically operates on a frequency repeater.

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