Single ended line probing in DSL system using transformerless hybrid
AssigneeCentillium Communications, Inc.
InventorsJalil Kamali, Farrokh Rashid-Farrokhi
Life of this patent
Estimating the term…
Abstract
Single Ended Line Probing (SELP) techniques for devices having transformerless hybrid circuits are disclosed. These SELP techniques provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in Digital Subscriber Line (DSL) system) by computing a transfer function that accounts for the characteristics of the transformerless hybrid circuit and the transmission medium, and relating the transfer function to the length of the transmission medium at one or more frequencies.
Claims24
A method of estimating the length of a transmission medium included in a communication system having a transformerless hybrid circuit, comprising:
- transmitting a probe signal over the transmission medium by way of the transformerless hybrid circuit;
- measuring a reflected version of the probe signal received from the transmission medium;
- determining a transfer function characterizing the transmission medium and the transformerless hybrid circuit based on the transmitted probe signal and the reflected version of the probe signal;
- and
- estimating the length of the transmission medium based on the transfer function.
A system for estimating the length of a transmission medium included in a communication system having a transformerless hybrid circuit, comprising:
- a transformerless hybrid circuit for transmitting a probe signal over the transmission medium;
- and
- a processor operatively coupled to the transformerless hybrid circuit for determining a transfer function characterizing the transmission medium and the transformerless hybrid circuit based on the transmitted probe signal and a reflected version of the probe signal received from the transmission medium, and for estimating the length of the transmission medium based on the transfer function.
A computer-readable medium having stored thereon instructions which, when executed by a processor, cause the processor to perform the steps of:
- measuring a reflected version of a transmitted probe signal received from the transmission medium;
- determining a transfer function characterizing the transmission medium and the transformerless hybrid circuit based on the transmitted probe signal and the reflected version of the probe signal;
- and
- estimating the length of the transmission medium based on the transfer function.
A Digital Subscriber Line (DSL) modem, comprising:
- transformerless hybrid circuit means for transmitting a probe signal over the transmission medium;
- and
- processing means operatively coupled to the transformerless hybrid circuit means for determining a transfer function characterizing the transmission medium and the transformerless hybrid circuit means based on the transmitted probe signal and a reflected version of the probe signal received from the transmission medium, and for estimating the length of the transmission medium based on the transfer function.
Dependencies are inferred from the claim text.