Patent ID: 6647069
Filing Date: 2003-11-11
Classification: H04N

Abstract:
A communication system for communicating a data signal using a cable television transmission medium, the communication arrangement comprising:an encoder configured to encode an input data stream as an encoder output signal; a transmission filter arrangement, responsive to the encoder output signal and configured to reduce adjacent channel interference in the encoder output signal and to generate a filter output signal; a modulator, configured to modulate the filter output signal, generating a modulated radio frequency signal for transmission using the cable television transmission medium; and a receiver arrangement coupled to receive the modulated radio frequency signal and configured to generate a stream of detected data based on the received modulated radio frequency signal, wherein the receiver arrangement comprises: an analog front end arrangement, configured to sample a desired signal from the received modulated radio frequency signal at less than the Nyquist rate and to cause thereby a shift in a center frequency of the desired signal from an initial frequency to a lower frequency; a modified matched filter configured to perform a convolution of a square-root raised cosine filter and a pre-calculated filter and to generate a modified matched filter output signal; an adaptive equalizer, responsive to the modified matched filter output signal and configured to generate an equalizer output signal; and a decoder, responsive to the equalizer output signal and configured to decode the equalizer output signal and to generate the stream of detected data.