Systems and methods for loop length and bridged tap length determination of a transmission line
First Claim
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1. A loop length and bridged tap length estimation system comprising:
- a central office (CO) modem;
a customer-premises equipment (CPE) modem;
a channel impulse response device that determines a channel impulse response for a transmission line based on signals transmitted during initialization of the CO modem and CPE modem;
a modeling device that determines a theoretical channel impulse response; and
a loop length and bridged tap determination device that determines a loop length and at least one bridged tap length based on a comparison of the channel impulse response and the theoretical channel impulse response.
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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
37 Claims
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1. A loop length and bridged tap length estimation system comprising:
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a central office (CO) modem;
a customer-premises equipment (CPE) modem;
a channel impulse response device that determines a channel impulse response for a transmission line based on signals transmitted during initialization of the CO modem and CPE modem;
a modeling device that determines a theoretical channel impulse response; and
a loop length and bridged tap determination device that determines a loop length and at least one bridged tap length based on a comparison of the channel impulse response and the theoretical channel impulse response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining a loop length and at least one bridged tap for a transmission line comprising:
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initializing a central office (CO) modem and a customer-premises equipment (CPU) modem;
estimating a channel impulse response based on signals transmitted during the initialization step;
determining a theoretical channel impulse response;
comparing the theoretical channel impulse response and the estimated channel impulse response; and
determining the loop length and at least one bridged tap based on an error minimization function. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An information storage media comprising information that determines a loop length and at least one bridged tap for a transmission line comprising:
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information that initializes a central office (CO) modem and a customer-premises equipment (CPE) modem;
information that estimates a channel impulse response based on signals transmitted during the initialization;
information that determines a theoretical channel impulse response;
information that monitors a difference between the theoretical channel impulse response and the estimated channel impulse response; and
information that determines the loop length and at least one bridged tap based on an error minimization function. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification