Systems and methods for loop length and bridged tap length determination of a transmission line
First Claim
Patent Images
1. A loop length estimation system comprising:
- a controller; and
a loop length output device capable of;
estimating a channel transfer function using one or more signals from an initialization, the initialization occurring between a first multicarrier modem on a first end of a transmission line and a second multicarrier modem on a second end of the transmission line, the one or more signals from the initialization having been transmitted or received using a multiplicity of discrete frequency carriers;
determining a theoretical channel transfer function of the transmission line;
comparing the theoretical channel transfer function and the estimated channel transfer function; and
determining an estimated loop length of the transmission line based upon said comparison,wherein the theoretical transfer function has as an input a parameter related to a gauge of the transmission line.
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Abstract
Through the use of a least squares minimization concept, the loop length, the number of bridged taps and length of the bridged taps on a transmission line can be determined from readily available modem data. In particular, the loop length, the number of bridge taps and the length of bridged taps can be estimated by comparing a measured frequency domain channel impulse response of the transmission line to a model of a loop that is comprised of multiple sections and multiple bridge taps.
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Citations
19 Claims
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1. A loop length estimation system comprising:
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a controller; and a loop length output device capable of; estimating a channel transfer function using one or more signals from an initialization, the initialization occurring between a first multicarrier modem on a first end of a transmission line and a second multicarrier modem on a second end of the transmission line, the one or more signals from the initialization having been transmitted or received using a multiplicity of discrete frequency carriers; determining a theoretical channel transfer function of the transmission line; comparing the theoretical channel transfer function and the estimated channel transfer function; and determining an estimated loop length of the transmission line based upon said comparison, wherein the theoretical transfer function has as an input a parameter related to a gauge of the transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to estimate a loop length of a transmission line comprising:
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estimating, using a processor, a channel transfer function using one or more signals from an initialization, the initialization occurring between a first multicarrier modem on a first end of the transmission line and a second multicarrier modem on a second end of the transmission line, the one or more signals from the initialization having been transmitted or received using a multiplicity of discrete frequency carriers; determining a theoretical channel transfer function of the transmission line; comparing, by a controller, the theoretical channel transfer function and the estimated channel transfer function; and determining the estimated loop length of the transmission line based upon said comparison, wherein the theoretical transfer function has as an input a parameter related to a gauge of the transmission line. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification