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Decision-directed echo cancellation for full-duplex data transmission at 4800bps

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2 Author(s)
Quatieri, T.F. ; Massachusetts Institute of Technology, Lexington, Massachusetts ; O'Leary, G.C.

In this paper, we present a design for a full-duplex near-echo-cancelling data modem based on a cambined "decision-directed" (DD) adaptive echo canceller and adaptive channel equalizer. This algorithm has the important feature that the interference to the canceller caused by the far-end signal is eliminated by subtracting an estimate of the far-end signal based on receiver decisions. This technique is extended to provide a new approach to full-duplex far-echo cancellation in which frequency offset of the far echo is adaptively estimated with little interference from the far-end signal and near echo. The approach uses receiver decisions on the far-end signal, but in addition, relies on a separate receiver structure devoted to joint estimation of the far-echo channel and the frequency offset in the far echo. The feasibility of both echo-cancelling modem algorithms is demonstrated by computer simulation with realistic channel distortions and with 4800 bps data transmission at which rate frequency offset in the far echo becomes important.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.  (Volume:11 )

Date of Conference:

Apr 1986

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