US 2021/0083718 A1Published application

Echo cancellation in a multiport data transceiver

AssigneeVecima Networks Inc.

InventorCarl Nuzman

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Abstract

A multiport FDX data transceiver having (i) digital transmit and receive chains shared by the multiple ports thereof and (ii) a multi-stage echo-cancellation circuit capable of canceling the echo of the transmitted signal that is coupled back into the receive chain through the analog front end of the transceiver. In an example embodiment, the echo-cancellation circuit comprises two stages. The first stage operates to remove a dominant echo signal corresponding to the output signal that is being broadcast on the multiple ports of the transceiver. The second stage operates to remove a residual echo signal typically caused by differences in the pertinent characteristics of the circuits associated with the different ports of the transceiver. In some embodiments, the multi-stage echo-cancellation circuit can be used for training a single-stage echo-cancellation circuit that may be unable to sufficiently quickly converge on an optimal set of filter coefficients on its own.

Claims20

Dependent claims

An apparatus comprising a data transceiver that comprises an analog front end having a plurality of ports, a digital transmit chain, and a digital receive chain, the digital transmit chain being configured to drive the analog front end to cause an output signal to be transmitted on the plurality of ports with some energy of the output signal being coupled through the analog front end into the digital receive chain as an echo signal;

wherein the data transceiver further comprises a first echo-cancellation circuit having at least a first stage and a second stage connected in series, the first echo-cancellation circuit being configurable to cancel the echo signal in response to a plurality of monitor signals received from the analog front end;
wherein the first stage comprises a plurality of first adaptive filters, each of the first adaptive filters having a respective feed-through path and a respective first tap, each of the respective first taps being connected to receive one of the plurality of monitor signals, one of the respective feed-through paths being connected to receive a data signal generated in response to one or more input signals received on the plurality of ports, and other ones of the respective feed-through paths being connected to receive other ones of the plurality of monitor signals;
and
wherein the second stage is connected to receive signals outputted by the respective feed-through paths of the plurality of first adaptive filters.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 17/086,523Filed 2 Nov 2020
Priority: 16 May 2018
Published: 18 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04B 1/525
Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of…
H04B 3/237
Using a replica of transmitted signal in the time domain, e.g. echo cancellers: using two adaptive filters, e.g. for near end and for end echo…
H04B 1/12
Means associated with receiver for limiting or suppressing noise or interference: neutralising, balancing, or compensation arrangements
H04B 1/40
Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of…: circuits

Family

Application15/980,865Continuation · filed 16 May 2018
Application17/086,523Continuation
US 10,826,559 B2Related patent
US 2019/0356353 A1Published application
US 2021/0083718 A1This patent

From the US filing history. Foreign family members aren’t listed.