Abstract
In wireline communications, echo is a problem affecting analog front-end dynamic range and received signal to noise ratio. Echo cancellation schemes were devised using adaptive filtering but they are computationally expensive. Traditionally, echo cancellers are implemented using adaptive FIR filters that tend to be long to allow for enough echo rejection. In this paper a new equation-error based IIR-tail connected in tandem with FIR echo canceller is introduced. The new architecture can save up to 50% of the number of FIR taps needed for the echo cancellation. Simplified weight update for the new architecture is examined using block-update LMS for the FIR portion and full update for the IIR portion. The combined savings can be up to 70% compared to regular FIR only adaptive echo canceller. Echo rejection performance is verified via simulations and adaptive IIR stability is confirmed for the equation-error based adaptation
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