Patent ID: 7200193

Claim:
A communications method with correlated noise removal in a demodulator system, the method comprising the steps of: translating a quadrature vestigial-sideband (QVSB) signal to inphase and quadrature (I/Q) baseband components, r T iq and r T qi ; filtering the baseband components to generate I and Q channel cross-coupled filtering outputs; estimating transmitted data content of the I and Q channel cross-coupled filtering outputs; employing the estimated data content to reconstruct originally transmitted I/Q signals, {tilde over (s)} T iq and {tilde over (s)} T qi ; processing the reconstructed signal components and the inphase and quadrature (I/Q) baseband components to generate correlated-noise estimates, {circumflex over (n)} i and {circumflex over (n)} q ; subtracting the correlated-noise estimates, {circumflex over (n)} i and {circumflex over (n)} q , from the cross-coupled filtering outputs to yield receive-filtered I/Q signals in white noise, r iq and r qi ; and procesing the receive-filtered I/Q signals in white noise to provide optimal data estimates, {circumflex over (m)}.