A 70 Mb/s variable-rate DMT-based modem for VDSL

Author

Veithen, D. ; Spruyt, P. ; Pollet, T. ; Peeters, M. ; Braet, S. ; Van de Wiel, O. ; Van De Weghe, H.

Author_Institution

Alcatel Bell Telephone, Antwerp, Belgium

fYear

1999

fDate

17-17 Feb. 1999

Firstpage

248

Lastpage

249

Abstract

Very high-speed digital subscriber line (VDSL) technology can deliver data at multi-Mbits/s over the unshielded, twisted pair in overlay to the plain old telephone service (POTS) and ISDN services. Discrete multi-tone (DMT) is one candidate for the modulation of VDSL. The DMT transmit signal is the sum of independent quadrature amplitude modulated (QAM) carriers spread over a bandwidth of 11.04 MHz. Time division duplexing (TDD) is used to provide a half-duplex communication channel over a single pair. This chip integrates the complete digital signal processing required by a TDD-DMT VDSL system and the Transport Convergence (TC) sublayer functions such as (de)interleaving, Reed-Solomon (de)coding, (de)scrambling, (de)framing and the ATM-specific TC functions. It can be used both at the network termination (NT) and the line termination (LT) side.

Keywords

Reed-Solomon codes; asynchronous transfer mode; digital subscriber lines; interleaved codes; modems; quadrature amplitude modulation; time division multiplexing; twisted pair cables; 11.04 MHz; 70 Mbit/s; ATM-specific TC functions; Reed-Solomon coding; TDD-DMT VDSL system; VDSL; discrete multi-tone; framing; half-duplex communication channel; independent quadrature amplitude modulated carriers; interleaving; line termination; network termination; scrambling; time division duplexing; transport convergence sublayer functions; twisted pair; variable-rate DMT-based modem; very high-speed digital subscriber line; Amplitude modulation; Bandwidth; Communication channels; DSL; Digital signal processing chips; ISDN; Modems; OFDM modulation; Quadrature amplitude modulation; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1999. Digest of Technical Papers. ISSCC. 1999 IEEE International

Conference_Location

San Francisco, CA

ISSN

0193-6530

Print_ISBN

0-7803-5126-6

Type

conf

DOI

10.1109/ISSCC.1999.759222

Filename

759222