Patent ID: 6553085
Filing Date: 2003-04-22
Classification: H04B,H04J,H04L

Abstract:
In a bi-directional data channel between a central station and a plurality of remote stations, wherein the central station and the plurality of remote stations comprises a plurality of transmitters and receivers, a method for equalizing interference over one of a synchronized packet and frame based baseband transmission system wherein the crosstalk on the system is cyclostationary or periodic with a period equal to a symbol interval, the method comprising the steps of:synchronizing the transmitters and receivers; generating an interference signal at the synchronized transmitters at one or more remote stations and the central station; using cascaded Fractionally Spaced Linear Equalizer (FSLE) and Decision Feed back Equalizer (DFE) for both interference suppression and equalization to increase a signal to noise ratio with a small excess bandwidth at the receivers; while holding the DFE constant, adding FSLE filter taps to the receiver FSLE filter to reduce pre-inter-symbol interference cursor and noise propagation; while holding the FSLE constant, adding DFE filter taps to the receiver DFE filter to reduce post-inter-symbol interference; and combining a first signal output from the FSLE/DFE with phase sampling adjustments, to increase the signal to noise ratio to enable use of spectral correlation properties peculiar to the generated interference signal.