Title :
Equalization for DMT based broadband modems
Author :
Pollet, Thierry ; Peeters, Miguel ; Moonen, Marc ; Vandendorpe, Luc
Author_Institution :
Alcatel Corp Res. Center, Antwerp, Belgium
fDate :
5/1/2000 12:00:00 AM
Abstract :
Faced with fierce competition from cable operators, telephone companies are now aggressively investing in digital subscriber line technology with the objective of providing an economic broadband access alternative. However, high-bit-rate transmissions over the metallic access network is far from trivial. The subscriber loop predominantly consists of interconnection of twisted pair copper sections. This causes severe attenuation of the high-frequency components of the transmitted signal. Equalization refers to the signal processing in the transceiver to combat the effects of the dispersive channel on the transmitted signal. This article overviews equalization methods for discrete multitone modulation (DMT). The interference structure created by a non-ideally equalized channel is analyzed. Time modulation as well as frequency domain equalization methods are addressed
Keywords :
broadband networks; dispersive channels; equalisers; frequency-domain analysis; intersymbol interference; modems; modulation; subscriber loops; time-domain analysis; transceivers; twisted pair cables; Cu; DMT based broadband modems; HF components attenuation; ISI; VDSL; cable operators; digital subscriber line technology; discrete multitone modulation; dispersive channel; economic broadband access; equalization methods; frequency domain equalization methods; high-bit-rate transmissions; interference structure; metallic access network; nonideally equalized channel; signal processing; subscriber loop; telephone companies; time modulation; time-domain equalization; transceiver; transmitted signal; twisted pair copper sections; Attenuation; Communication cables; Copper; DSL; Modems; OFDM modulation; Signal processing; Subscriber loops; Telephony; Transceivers;
Journal_Title :
Communications Magazine, IEEE
