An echo canceller with controlled power for frequency offset correction
Abstract
In an echo canceller (EC) compensating far-end echos affected by frequency offset, the phase loop gain is highly dependent on the echo and signal powers. Adoption of a normalized gain multiplied by the echo power yields an improved robustness. It is shown that the latter gain depends only on the echo-to-signal ratio. Practical implementation of this idea is realized by generating a first unitary echo replica, on which the DPLL will act, and then controlling the output power. The system has the additional advantage of a reduced binary size for the canceller taps.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- April 1986
- Bibcode:
- 1986ITCom..34..408M
- Keywords:
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- Adaptive Filters;
- Cancellation Circuits;
- Echo Suppressors;
- Computerized Simulation;
- Phase Error;
- Power Gain;
- Signal To Noise Ratios;
- Communications and Radar