Adaptive impulse noise canceler for digital subscriber lines

Details Adaptive impulse noise canceler for digital subscriber lines Adaptive impulse noise canceler for digital subscriber lines

1992-10-13

1995-04-25

Dolinar, Andrew M.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327551, H04B 1500

Patent

active

054102642

ABSTRACT:
An impulse noise canceler includes circuitry which recognizes, locates, and cancels impulse noise when it occurs in an incoming signal. Impulse noise is characterized by a shape, an amplitude, and an arrival time, any or all of which may be unknown. In one implementation, adaptive circuitry is deployed to estimate the amplitude when it is the only unknown, and a replica of the impulse noise is generated and used to cancel the impulse noise in the incoming signal. In another implementation, both the arrival time and amplitude are estimated when they are unknowns, and a replica is again generated to cancel the original impulse noise. In yet another implementation, the shape, amplitude, and arrival time are all estimated of the impulse noise to produce the replica to cancel the original impulse noise.

REFERENCES:
patent: 3374435 (1968-03-01), Engel
patent: 3825843 (1974-07-01), Felsberg et al.
patent: 4587620 (1986-05-01), Niimi et al.
patent: 4914398 (1990-04-01), Jove et al.
"Impulse Noise in the Loop Plant", J. J. Werner, 1990 IEEE, pp. 1734-1737. (month unknown).
"The HDSL Environment", J. J. Werner, IEEE Journal on Selected Areas in Communications, vol. 9, No. 6, Aug. 1991, pp. 794,795,800.

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