Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1998-05-29
1999-05-11
Chan, Jason
Pulse or digital communications
Receivers
Interference or noise reduction
375229, 375233, 365 73, 365 76, H04B1/10
Patent
active
059036150
ABSTRACT:
A method and apparatus for estimating the frequency of a periodic signal and for canceling the interference in a modem signal. Power line noise may interfere with electronic signals. Since power lines may be either 50 Hz or 60 Hz, depending on the country, frequency estimation of the periodic power line noise is necessary. Modem signals are received and autocorrelated in order to identify the periodic characteristics of the signal over time. Once the frequency is identified, the power line noise is modeled based on creating a circular buffer. Initially, the circular buffer is composed of scaled samples of one cycle of the fundamental frequency of the power line noise. Thereafter, samples are received, scaled, and combined with previous buffer values in order to update the buffer. In this manner, the buffer models the power line noise, so that the power line noise may be removed from the system.
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Alelyunas Carl H.
Thomson Larry S.
3Com Corporation
Chan Jason
Tran Congvan
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