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Signal processing design for an ADSL high speed equalizer

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1 Author(s)
D. C. Jones ; Bellcore, Morristown, NJ, USA

An asymmetric digital subscriber line (ADSL) is an emerging technology for the transport of video services or other asymmetric high bit-rate services over the copper local loop plant. This paper describes the design and implementation of a high speed equalizer for an ADSL research prototype. This equalizer contains two complex adaptive 32-tap equalizers, and is capable of processing QAM or carrierless amplitude/phase (CAP) modulation signals up to 1 MBaud in speed. Implementation is via off-the-shelf fixed and programmable DSPs, with a resulting throughput in excess of 300 MIPS. Experimental results are presented indicating a reach of 18 kft of twisted copper pair for the system

Published in:

Communications, 1994. ICC '94, SUPERCOMM/ICC '94, Conference Record, 'Serving Humanity Through Communications.' IEEE International Conference on

Date of Conference:

1-5 May 1994