Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-10-25
1999-07-27
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
329318, 329319, 329320, H03D 104, H03D 106
Patent
active
059303107
ABSTRACT:
This invention relates to telecommunications systems. The present invention provides a system and method operable to the cancel interference from digital subscriber line systems. A data signal demodulator having first and second inputs arranged to receive differential data signals and local field RFI signals respectively, wherein a digital adaptive notch filter is formed by DSP means which locates an interferer in the differential signal by adapting its bandwidth and center frequency by adaptation means and wherein the center frequency and bandwidth of the notch filter are used to generate a bandpass filter centered on the interferer and of approximate bandwidth to the interferer; whose output, after processing forms a feedback signal which is sampled, processed, weighted and then combined with the local field RFI input signal of the demodulator, which combined signal is summed with the differential input signal to thereby cancel interference coupled onto the first input.
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patent: 5425052 (1995-06-01), Webster et al.
patent: 5500879 (1996-03-01), Webster et al.
patent: 5570395 (1996-10-01), Myers
patent: 5701598 (1997-12-01), Atkinson
Chin Stephen
Ghayour Mohammad
Northern Telecom Limited
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