Distributed adaptive bit-loading for spectrum optimization in multi-user multicarrier systems

This paper presents a low-complexity discrete bit-loading algorithm for multi-user multicarrier systems with application to spectrum balancing in digital-subscriber-lines. The algorithm can be implemented in a distributed manner using limited information that is sent to modems by a spectrum manageme...

Full description

Saved in:
Bibliographic Details
Published in:Physical communication Vol. 1; no. 1; pp. 40 - 59
Main Authors: Jagannathan, Sumanth, Cioffi, John M.
Format: Journal Article
Language:English
Published: Elsevier B.V 01.03.2008
Subjects:
Digital-subscriber-lines (DSL)
Dynamic spectrum management (DSM)
Interference channel
Multicarrier
Spectrum optimization
Spectrum optimization
Digital-subscriber-lines (DSL)
Interference channel
Dynamic spectrum management (DSM)
Multicarrier
ISSN:1874-4907, 1876-3219
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper presents a low-complexity discrete bit-loading algorithm for multi-user multicarrier systems with application to spectrum balancing in digital-subscriber-lines. The algorithm can be implemented in a distributed manner using limited information that is sent to modems by a spectrum management center (SMC). The SMC classifies users in the network as strong or weak, based on their channel and noise conditions. Weak users execute a discrete bit-loading algorithm approximating water-filling, such as the Levin–Campello (LC) algorithm, while strong users use a rate-penalty table along with a modified LC algorithm to limit their interference to weak users. Simulation results show that the proposed algorithm can achieve near-optimal performance. In addition, polite bit and gain adaptation algorithms are developed using the structure of the proposed bit-loading algorithm, which enables easy and fast adaptation to channel and noise variations.
ISSN:1874-4907
1876-3219
DOI:10.1016/j.phycom.2008.01.005