Systems and methods for loop length and bridged tap length determination of a transmission line
AssigneeAware, Inc.
InventorMurat Belge
Life of this patent
Estimating the term…
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.
Claims17
1-36. (canceled)
A modem-based upstream data loop length and bridged tap length estimation system comprising:
- a reverb signal determination device adapted to determine a transfer function by averaging a plurality of consecutive frames of a reverb signal;
- a controller adapted to determine a frequency domain propagation function for a specified wire gauge input from a storage device;
- an impedance determination device adapted to determine a frequency domain impedance of the specified wire gauge;
- the controller further adapted to:
- determine a transmit impedance of a CPE modem;
- determine a receive impedance of a CO modem;
- determine a matrix representing frequency domain responses of an ith section of a loop, the matrix representing a response of a bridged tap, and a FS matrix representing analog front end circuitry for source (TX) and load (RX) paths;
- estimate a transfer function (H);
- and
- input a calibrated and a compensated reverb signal in the frequency domain, and a reference gauge of a wire from the storage device;
- and
- a modem identification determining device adapted to determine an identification of the CO modem collecting the reverb signal, and the identification of the CPE modem transmitting the reverb signal, wherein since the number of elements in a receive function is known, the controller further minimizes a difference between actual and measured transfer functions, and outputs, with the cooperation of a loop length output device and a bridged tap output device, an estimated loop length and the estimated bridged tap length, respectively,
A modem-based upstream data loop length and bridged tap length estimation method comprising:
- determining a transfer function by averaging a plurality of consecutive frames of a reverb signal;
- determining a frequency domain propagation function for a specified wire gauge input from a storage device;
- determining a frequency domain impedance of the specified wire gauge;
- determining a transmit impedance of a CPE modem;
- determining a receive impedance of a CO modem;
- determining a matrix representing frequency domain responses of an ith section of a loop, the matrix representing a response of a bridged tap, and a FS matrix representing analog front end circuitry for source (TX) and load (RX) paths;
- determining a transfer function (H);
- and
- inputting a calibrated and a compensated reverb signal in the frequency domain, and a reference gauge of a wire from the storage device;
- and
- determining an identification of the CO modem collecting the reverb signal, and the identification of the CPE modem transmitting the reverb signal, wherein since the number of elements in a receive function is known, a difference between actual and measured transfer functions can be determined and an estimated loop length and the estimated bridged tap length output.
Dependencies are inferred from the claim text.