Title :
A data-driven multitone echo canceller
Author :
Cioffi, John M. ; Bingham, John A C
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA, USA
fDate :
10/1/1994 12:00:00 AM
Abstract :
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
Keywords :
adaptive filters; data communication systems; echo suppression; filtering and prediction theory; frequency-domain analysis; interference suppression; modulation; protocols; time-domain analysis; MTEC; cancellation range; data-driven multitone echo canceller; delay; eigenvalue-spread problems; far-end data signal; far-end echo; frequency offset; frequency-domain updating; full-duplex data transmission; initialization; interframe interpolation; multitone modulation; near-end echo; numerical performance; received signal path; time-domain implementation; Bit error rate; Echo cancellers; Eigenvalues and eigenfunctions; Frequency estimation; Modems; Protocols; Pulse modulation; Quadrature amplitude modulation; Senior members; Time domain analysis;
Journal_Title :
Communications, IEEE Transactions on
