US 6,687,235 B1 · Mitigation of non-linear signal perturbations using truncated volterra-based non-linear echo canceler

Abstract

A non-linear echo cancellation scheme for a digital transceiver coupled to a wireline medium effectively mitigates against non-linear line perturbations that may cause disruption of digital communication services. A first embodiment employs a fast, linear echo canceler, and a truncated non-linear Volterra canceler coupled to an error cancellation location in the data signal flow path downstream of the data pump's linear equalizer. A second embodiment employs only a nonlinear Volterra echo canceler, the output of which is coupled to an error cancellation location in the data signal flow path upstream of the data pump's linear equalizer. A third embodiment employs a linear echo canceler with high gain setting on selected taps, and a truncated non-linear Volterra canceler coupled to an error cancellation location in the data signal flow path downstream of the data pump's linear equalizer.

Claims24

Dependent claims

An arrangement for transmitting digital communication signals over a two-wire transmission path comprising:

a data transmission path having an encoder configured to output an encoded data signal for transmission over said two-wire transmission path;
a data receiver path having a linear equalizer coupled in circuit with a decoder configured to decode a signal transmitted from a remote transceiver and received from said two-wire transmission path;
and
a first, non-linear echo canceler coupled downstream of said linear equalizer in said data receiver path and being operative to reduce from said data receiver path non-linear residual echo energy associated with said encoded data signal applied to said two-wire transmission path from said data transmission path.

1 more element

A method of transmitting digital communication signals over a two-wire transmission path comprising the steps of:

(a) providing a data transmission path that contains an encoder which is configured to output an encoded data signal for transmission over said two-wire transmission path, a data receiver path having a linear equalizer coupled in circuit with a decoder configured to decode a signal transmitted from a remote location and received from said two-wire transmission path, and a first, linear echo canceler coupled downstream of said linear equalizer in said data receiver path and being operative to reduce from said data receiver path energy associated with said encoded data signal applied to said two-wire transmission path from said data transmission path;
and
(b) mitigating against micro-interruptions, by coupling in circuit with said data receiver path a second, non-linear echo canceler that is operative to reduce from said data receiver path non-linear residual echo energy associated with said encoded data signal applied to said two-wire transmission path from said data transmission path.

Dependencies are inferred from the claim text.

Mitigation of non-linear signal perturbations using truncated volterra-based non-linear echo canceler

Life of this patent

Mitigation of non-linear signal perturbations using truncated volterra-based non-linear echo canceler

Life of this patent

Abstract

Claims24