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US 8,509,125 B1Granted
Method and apparatus for reducing nonlinear echo distortion in a communication device
AssigneeMarvell International Ltd.
InventorJagadish Venkataraman
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Abstract
Systems, methods, and other embodiments associated with echo cancellation are described. According to one embodiment, a method uses two signals from a transmitter as input to a look-up table to generate a non-linear echo cancellation signal. The non-linear echo cancellation signal is applied to a receiving path to reduce non-linear echo distortion on the receiving path based at least in part on the current signal and the previous signal.
Claims18
An apparatus, comprising:
- a transmitter connected to a transmission path;
- a receiver connected to a receiving path;
- and
- an echo canceller connected between the transmitter and the receiver, wherein the echo canceller includes a look-up table containing cancellation values, and wherein the look-up table is addressed by two consecutive signals from the transmission path;
- wherein one or more of the cancellation values in the look-up table are applied to the receiving path to cancel non-linear echo distortion in a signal that is fed back from the transmitter to the receiver, wherein the look-up table is a two-dimensional look-up table that is addressed in a first dimension by a current signal of the two consecutive signals and is addressed in a second dimension by a previous signal of the two consecutive signals, and wherein the two consecutive signals are data symbols.
2 more elements
A method, comprising:
- using a current signal and a previous signal from a transmitter as input to a look-up table to generate a non-linear echo cancellation signal, wherein the look-up table is a two-dimensional look-up table and the current signal addresses a column of the look-up table and the previous signal addresses a row of the look-up table;
- and
- applying the non-linear echo cancellation signal to a receiving path to reduce non-linear echo distortion on the receiving path based at least in part on the current signal and the previous signal.
A device comprising:
- a transmitter including a digital-to-analog converter;
- a receiver;
- and
- an echo cancellation circuit configured to cancel non-linear echo signals that are introduced by the digital-to-analog converter, wherein the echo cancellation circuit is configured to generate a cancellation signal that is determined from a current signal and a previous signal from the transmitter and to apply the cancellation signal to a signal at the receiver, wherein the echo cancellation circuit includes a look-up table, wherein entries in the look-up table are addressed by the current signal and the previous signal, wherein the look-up table is a two-dimensional look-up table, and wherein the current signal addresses a column in the look-up table and the previous signal addresses a row in the look-up table.
1 more element
Dependencies are inferred from the claim text.