NDLI: Precision-efficient use of block adaptive algorithms in data-driven echo cancellers

Content Provider	IEEE Xplore Digital Library
Author	Cioffi, M.
Copyright Year	1988
Description	Author affiliation: Inf. Syst. Lab., Stanford, CA, USA (Cioffi, M.)
Abstract	Data-driven echo cancellers are used in full-duplex voiceband data transmission at rates of 4800 b/s and above, and in digital subscriber loops for ISDN (integrated services digital network) at rates of 160 kb/s (or above). It is well-known that the required 60 dB of cancellation mandates high coefficient and processor precision if the stochastic-gradient (least-mean-squares (LMS)) adaptive algorithm for the echo canceller is implemented in fixed-point arithmetic. However, the use of block LMS or block adaptive algorithms significantly improves this situation without increasing computation. The improvement in numerical accuracy is traded (almost linearly) for a decrease in tracking speed of the echo canceller, which, however, is often an acceptable tradeoff as the echo channel does not exhibit significant time variation. A drawback of the block adaptive algorithms, their requirement of more temporary internal variables, is also discussed.<>
Starting Page	355
Ending Page	359
File Size	427654
Page Count	5
File Format	PDF
DOI	10.1109/ICC.1988.13590
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-06-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive algorithm Echo cancellers Least squares approximation Data communication DSL Roundoff errors Information systems Laboratories ISDN Fixed-point arithmetic
Content Type	Text
Resource Type	Article

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