An efficient bit-loading algorithm for DMT applications

This letter describes an efficient bit allocation algorithm for digital subscriber loop modems that use discrete multi-tone technology. The algorithm computes the optimum bit allocation profile within all constraints and requires fewer computations than the conventional "water-filling" app...

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Bibliographic Details
Published in:IEEE communications letters Vol. 4; no. 3; pp. 80 - 82
Main Authors: Sonalkar, R.V., Shively, R.R.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.03.2000
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Allocations
Applied sciences
Attenuation
Bins
Bit rate
Budgeting
Digital
DSL
Exact sciences and technology
Frequency
Interference
Iterative algorithms
Laboratories
Masks
Modems
OFDM modulation
Optimization
Spread spectrum communication
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Bit error rate
Interference
Data transmission
Digital loop
Integrated services digital network
Transceiver
Experimental result
Algorithm performance
Optimal allocation
High speed
Telecommunication network
Numerical simulation
Spread spectrum
Modem
Transmission speed
Signal to noise ratio
Power spectrum
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Description
Summary:This letter describes an efficient bit allocation algorithm for digital subscriber loop modems that use discrete multi-tone technology. The algorithm computes the optimum bit allocation profile within all constraints and requires fewer computations than the conventional "water-filling" approach. Conventional algorithms are unable to assign data bits to higher frequency bins over long loops with high level of interference due to the power spectrum mask limitation, even if the total power budget is not expended. We propose a novel scheme to distribute data over multiple bins at correspondingly reduced power in these, otherwise unpopulated bins.
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ISSN:1089-7798
1558-2558
DOI:10.1109/4234.831031