Method for matching an adaptive hybrid to a line

Details Method for matching an adaptive hybrid to a line Method for matching an adaptive hybrid to a line

2007-01-23

2007-01-23

Harold, Jefferey F. (Department: 2614)

Telephonic communications

Line equalization or impedance matching

C379S399010, C379S394000

Reexamination Certificate

active

10991487

ABSTRACT:
Methods for matching adaptive hybrids (15) to lines (16) for making reflectograms of the lines (16) measure (1) input impedances (Zmeas) of the lines (16), model (2) characteristic impedances of the lines (16) via physical models (Zphymod), estimate (3) parameters of the physical models (Zphymod) via cost functions which depend on the measured input impedances (Zmeas), convert (30) the modelled characteristic impedances into impedance values (13), and set (31) the adaptive hybrids (15) with the impedance values (13). Unwanted near-end reflections are minimised and wanted reflections can be measured. The physical models depend on frequencies s, Bessel functions Jiand parameters airelated to geometrical dimensions A, D and L and material constants σ, ε and μ of the lines (16). The method may further model (6) characteristic impedances of the lines (16) via rational function models (Zrafumod) and estimate (7) parameters of the rational function models (Zrafumod) via further cost functions which depend on outcomes of the physical models (Zphymod).

REFERENCES:
patent: 6208732 (2001-03-01), Moschytz et al.
patent: 6724890 (2004-04-01), Bareis
Arnaut L R: “Adaptive Control and Optimization of Electromagnetic Radiation, Attenuation, and Scattering Using Self-Adaptive Material Systems,” IEEE Transactions on Antennas and Propagation, IEEE Inc. New York, US, vol. 51, No. 7, Jul. 2003, pp. 1530-1548, XP001170048.

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