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A data-driven multitone echo canceller

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2 Author(s)
J. M. Cioffi ; Inf. Syst. Lab., Stanford Univ., CA, USA ; J. A. C. Bingham

A data-driven echo canceller for full-duplex data transmission with multitone modulation is presented. This multitone echo canceller (MTEC) is not impaired by eigenvalue-spread problems that are inherent in signal-driven echo cancellers-it has numerical performance and cancellation range that equals, and in most cases exceeds, that of data-driven echo cancellers used in data transmission with baseband or quadrature amplitude modulation. The method makes use of frequency-domain updating, but time-domain implementation of the canceller. It introduces no delay into the received signal path and presents no special difficulties for interframe interpolation between near-end echo, far-end echo, or far-end data signal. The authors also investigate the fast initialization and the special case of far-end frequency offset in the echo signal

Published in:

IEEE Transactions on Communications  (Volume:42 ,  Issue: 10 )