A far-end echo canceller with a digital filter for simulating a

Details A far-end echo canceller with a digital filter for simulating a A far-end echo canceller with a digital filter for simulating a

1991-08-27

1994-04-12

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375118, 379411, H04J 1500

Patent

active

053032284

ABSTRACT:
A far-end echo path may be simulated at a terminal which utilizes QAM by processing the in-phase and quadrature data symbols by a pulse shaping filter whose transfer function may be a raised cosine function. The in-phase and quadrature data symbols are then multiplied by cos (.omega..sub.c +.omega..sub.o)t and sin (.omega..sub.c +.omega..sub.o)t, respectively, where .omega..sub.c is the carrier frequency and .omega..sub.o is the adaptively determined offset frequency of the far-end echo signal. The output signals of the multipliers are then summed and the result is processed by a single transversal filter whose transfer function is determined adaptively. The output of this filter is a simulated far-end echo signal.

REFERENCES:
patent: 4646173 (1987-02-01), Kammeyer et al.
patent: 4786884 (1988-11-01), Wouda et al.
patent: 4813073 (1989-03-01), Ling
patent: 5084866 (1992-01-01), Buttle
patent: 5189664 (1993-02-01), Cheng

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