Abstract
The performance of data-driven echo cancellers in general switched telephone networks (GSTN) in the presence of different faults is documented. Results are collected by simulating an echo channel obtained from a telephone channel simulator with the CCITT model M.1025 placed in the forward path. Problems considered are additive noise, frequency offset and phase hits, with the emphasis on the latter. A new scheme of sequential adaptation for the canceller taps and the phase roll compensator is proposed for a simplified structure. The new scheme is compared to the conventional joint adaptation. Results show that in addition to easing computation burden during full-duplex transmission, the new scheme is more suitable for telephone links with significant phase hits.
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