Single-ended transfer function estimation of telephone links for deployment of xDSL services

Licinius Alcantara, Roberto Rodrigues, Agostinho Castro, João Crisostomo Weyl Albuquerque Costa, Fredrik Lindqvist, Jaume Riu

DOI: 10.14209/sbrt.2005.267

Evento: XXII Simpósio Brasileiro de Telecomunicações (SBrT2005)

Keywords: Digital subscriber line maximum-likelihood estimation loop qualification one-port scattering parameter transfer function single-ended tests

Abstract

The transfer function (HV) estimation is an essential procedure to qualify a twisted-pair loop for xDSL data transmission. The transfer function can be indirectly estimated via one-port scattering parameter (S11), which fetches the commodities of single-ended measurements. For this purpose, the viability of the physical line model VUB0 was extensively tested on the parametric estimation of the S11 spectral behavior. The obtained parameters are then used to estimate HV. The approach was improved to consider an arbitrary loop scenario, and empirically bettered initial guesses for the VUB0 parameters were employed to increase the consistency of the estimator for complex loops.

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