Method and apparatus capable of quickly identifying an unknown s

Details Method and apparatus capable of quickly identifying an unknown s Method and apparatus capable of quickly identifying an unknown s

1994-03-07

1995-10-03

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

370 321, 375232, 379 3, H04B 323

Patent

active

054558190

ABSTRACT:
In an identification apparatus for identifying an unknown system in response to a transmission input signal and an echo signal which includes multiple echoes sent through the unknown system, a plurality of adaptive filters each of which has a plurality of taps are supplied with the transmission signal in parallel to individually identify the multiple echoes by successively modifying tap coefficients in each adaptive filter. Information is transmitted from a j-th adaptive filter to a (j+1)-th adaptive filter to identify each of the multiple echoes. Each adaptive filter monitors modification times of tap coefficients or ERLE. Alternatively, a step size is changed from one to another to be delivered to tap coefficient generators and to accomplish high speed convergence.

REFERENCES:
patent: 5307405 (1994-04-01), Sih
patent: 5375147 (1994-12-01), Awata et al.
B. Widro et al. "Adaptive Noise Cancelling: Principles and Applications", vol. 63, No. 12, pp. 1692-1716, Dec. 1975 (Proceedings of the IEEE).
J. Nagumo et al. "A Learning Method for System Identification", vol. AC-12, No. 3, pp. 282-287 Jun. 1967 (IEEE Transactions on Automatic Control).
S. Ideda et al. "A Fast Convergence Algorithm for Adaptive Fir Filters W/ Coarsely Located Taps", pp. 1525-1528, May 14-17, 1991 (Proceedings of the ICASSP).
A. Sugiyama et al. "A Fast Algorithm for Adaptive Fir W/ Coarsely-Located Coefficients for Cancellation of Multiple Echoes", 1992, (C&C Systems Research Laboratories).

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