NDLI: Adaptive Echo Cancellation for an On-Frequency RF Repeater using a Weighted Power Spectrum

Content Provider	IEEE Xplore Digital Library
Author	Braithwaite, R.N. Carichner, S.
Copyright Year	2007
Description	Author affiliation: Powerwave Technol., Santa Ana (Braithwaite, R.N.; Carichner, S.)
Abstract	Adaptive echo cancellation based on a weighted power spectrum is discussed for use in an on-frequency RF repeater with a digital IF stage. Radiated coupling between the input and output antennas cause echoes to be transmitted by a repeater. Echo cancellation, a technique used to reduce the effect, is often based on the auto-correlation of the repeater signal and is effective when the width of the auto-correlation of the input signal is less than the loop delay of the echo path. Narrow bandwidth signals such as EDGE cause problems because the auto-correlations of the input signal and echo overlap. However, in this paper it is shown that the repeater signal can be filtered to reduce the width of the autocorrelation by adjusting the power of all carriers within the input signal to the same power density. A method is presented for partitioning the power spectrum into disjoint bands approximating carrier bandwidths and computing a weighting function that normalizes the carriers. This is done without affecting the ripples within the power spectrum that are needed to detect the echoes. Results based on computer simulation models are provided.
Starting Page	82
Ending Page	85
File Size	280538
Page Count	4
File Format	PDF
ISBN	9782874870033
DOI	10.1109/ECWT.2007.4403951
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-08
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	European Microwave Association
Subject Keyword	Radio frequency Echo cancellers Filters Fourier transforms Feedback Bandwidth echo suppression Repeaters Arthritis Autocorrelation Delay
Content Type	Text
Resource Type	Article

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