Adaptive integrated hybrid with complex adaptation for digital subscriber line systems
AssigneeIkanos Communications, Inc.
InventorsArnold Muralt, Eduard Sackinger, Fenghua Zheng, Fred Larsen
Life of this patent
Estimating the term…
Abstract
An adaptive hybrid system is coupled to a loop for adjusting trans-hybrid loss. The system comprises a fixed portion comprising a first receiver transfer function block and a first hybrid transfer function block. The fixed portion is configured to receive a far-end signal and mitigate frequency dependent attenuation experienced by the far-end signal. The system also comprises a variable portion comprising a second receiver transfer function block and a second hybrid transfer function block configured to subtract a transmit echo from the received far-end signal.
Claims20
An adaptive hybrid system coupled to a loop for adjusting trans-hybrid loss, the system comprising:
- a fixed component comprising a first receiver transfer function block and a first hybrid transfer function block, wherein the fixed component is configured to receive a far-end signal and mitigate frequency dependent attenuation experienced by the far-end signal;
- and
- a variable component comprising a second receiver transfer function block and a second hybrid transfer function block configured to remove transmit echo from the received far-end signal.
A method performed in an adaptive hybrid circuit for adjusting trans-hybrid loss on a loop, comprising:
- receiving an echo signal;
- adjusting a transfer function of a receive filter to pass low frequency components in the received echo signal;
- selecting and activating a resistor array connected in parallel to an output of the adaptive hybrid circuit;
- adjusting a transfer function of a receive filter to pass high frequency components in the received echo signal;
- and
- selecting and activating a capacitor array connected in parallel to an output of the adaptive hybrid circuit.
A method for tuning an adaptive hybrid circuit to adjust trans-hybrid loss on a loop, comprising:
- during initialization, performing two-dimensional tuning of components in the adaptive hybrid circuit, wherein the two-dimensional tuning comprises:
- selecting a resistor array among two resistor arrays that minimizes a gain of an echo signal;
- and
- selecting a capacitor array among two capacitor arrays that minimizes a gain slope and a phase of the echo signal;
- and
- applying the tuned components in the adaptive hybrid circuit during normal operation.
Dependencies are inferred from the claim text.