A 1.6 Mbps digital-QAM system for DSL transmission

Author

Daneshrad, B. ; Samueli, H.

Author_Institution

Dept. of Digital Commun. Res., AT&T Bell Labs., Holmdel, NJ

Volume

13

Issue

9

fYear

1995

fDate

12/1/1995 12:00:00 AM

Firstpage

1600

Lastpage

1610

Abstract

An all digital-QAM system is studied here for high-speed data transmission on digital subscriber loops. All elements of the system have been fully investigated and their effects on overall system performance documented. In particular, the following issues have been explicitly addressed: utility of an adaptive error-prediction (noise-prediction) filter; equalizer size and convergence; blind equalization; choice of constellation size and center frequency; combined timing/carrier recovery; and the oversampling requirements of a numerically-controlled-oscillator (NCO) for potential use in the timing and carrier recovery loop. The paper relies on simulation results to investigate and quantify the overall interactions of the various blocks. Throughout the paper emphasis has been placed on reducing the complexity of the system for implementation on an integrated circuit (IC). It is expected that the information provided here will serve as a good starting point for an IC designer to start the implementation of a transceiver ASIC

Keywords

adaptive equalisers; adaptive filters; convergence of numerical methods; data communication; quadrature amplitude modulation; subscriber loops; 1.6 Mbit/s; DSL transmission; adaptive error-prediction filter; blind equalization; center frequency; combined timing/carrier recovery; constellation size; convergence; digital subscriber loops; digital-QAM system; equalizer size; high-speed data transmission; integrated circuit; numerically-controlled-oscillator; oversampling requirements; simulation results; system performance; transceiver ASIC; Adaptive equalizers; Adaptive filters; Blind equalizers; Circuit simulation; Convergence of numerical methods; DSL; Data communication; Frequency; System performance; Timing;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.475533

Filename

475533