Title :
An Echo Canceller with Controlled Power for Frequency Offset Correction
Author :
Macchi, Odile ; Park, Kyu Ho
Author_Institution :
CNRS-ESE, Gif-sur-Yvette, France
fDate :
4/1/1986 12:00:00 AM
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.
Keywords :
Echo interference; Phase jitter; Adaptive control; Adaptive filters; Additive noise; Data communication; Echo cancellers; Error correction; Frequency; Power generation; Programmable control; Telephony;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOM.1986.1096535