Patent ID: 6947449

Claim:
Apparatus for a communication system in which data is communicated to a receiving station on a communication link susceptible to distortion, said apparatus for facilitating recovery of the data, communicated pursuant to a frequency division multiplexing scheme as a first data part communicated upon a first sub-band and at least a second data-part communicated upon at least a second sub-band, adjacent ones of the first and at least second sub-bands partially overlapping in frequency, said apparatus comprising: a data-part isolating a filter coupled to receive indications of values of the data, once received at the receiving station, said data-part isolating filter for forming separate filtered values within frequency ranges defining each of the first and at least second sub-bands, respectively; a pre-filter sample coupled to receive the separate filtered values formed by said data-part isolating filter for each of the first and at least second sub-bands, said pre-filter sampler for sampling the separate filtered values applied thereto at sampling rates causing frequency-shifting of selected portions of each of the separate filtered values to out-of-bound frequency ranges; and a pre-filter rejection filter coupled to said pre-filter sampler, said pre-filter rejection filter for rejecting the selected portions of each of the separate filtered values frequency-shifted by said pre-filter sampler and for forming therefrom filtered representations of each of the first and at least second data-parts.