The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management
<p/> <p>Dynamic spectrum management (DSM) has been proposed to achieve next-generation rates on digital subscriber lines (DSL). Because the copper twisted-pair plant is an interference-constrained environment, the multiuser performance and spectral compatibility of DSM schemes are of pri...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2006-01-01
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| Series: | EURASIP Journal on Advances in Signal Processing |
| Online Access: | http://dx.doi.org/10.1155/ASP/2006/78524 |
| _version_ | 1811284181302378496 |
|---|---|
| author | Brady Mark H Cioffi John M |
| author_facet | Brady Mark H Cioffi John M |
| author_sort | Brady Mark H |
| collection | DOAJ |
| description | <p/> <p>Dynamic spectrum management (DSM) has been proposed to achieve next-generation rates on digital subscriber lines (DSL). Because the copper twisted-pair plant is an interference-constrained environment, the multiuser performance and spectral compatibility of DSM schemes are of primary concern in such systems. While the analysis of multiuser interference has been standardized for current <it>static</it> spectrum-management (SSM) techniques, at present no corresponding standard DSM analysis has been established. This paper examines a multiuser spectrum-allocation problem and formulates a lower bound to the achievable rate of a DSL modem that is tight in the presence of the worst-case interference. A game-theoretic analysis shows that the rate-maximizing strategy under the worst-case interference (WCI) in the DSM setting corresponds to a Nash equilibrium in pure strategies of a certain <it>strictly competitive</it> game. A Nash equilibrium is shown to exist under very mild conditions, and the rate-adaptive waterfilling algorithm is demonstrated to give the optimal strategy in response to the WCI under a frequency-division (FDM) condition. Numerical results are presented for two important scenarios: an upstream VDSL deployment exhibiting the near-far effect, and an ADSL RT deployment with long CO lines. The results show that the performance improvement of DSM over SSM techniques in these channels can be preserved by appropriate distributed power control, even in worst-case interference environments.</p> |
| first_indexed | 2024-04-13T02:25:52Z |
| format | Article |
| id | doaj.art-9f27a40798c84028b8562c950706b231 |
| institution | Directory Open Access Journal |
| issn | 1687-6172 1687-6180 |
| language | English |
| last_indexed | 2024-04-13T02:25:52Z |
| publishDate | 2006-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Advances in Signal Processing |
| spelling | doaj.art-9f27a40798c84028b8562c950706b2312022-12-22T03:06:48ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802006-01-0120061078524The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum ManagementBrady Mark HCioffi John M<p/> <p>Dynamic spectrum management (DSM) has been proposed to achieve next-generation rates on digital subscriber lines (DSL). Because the copper twisted-pair plant is an interference-constrained environment, the multiuser performance and spectral compatibility of DSM schemes are of primary concern in such systems. While the analysis of multiuser interference has been standardized for current <it>static</it> spectrum-management (SSM) techniques, at present no corresponding standard DSM analysis has been established. This paper examines a multiuser spectrum-allocation problem and formulates a lower bound to the achievable rate of a DSL modem that is tight in the presence of the worst-case interference. A game-theoretic analysis shows that the rate-maximizing strategy under the worst-case interference (WCI) in the DSM setting corresponds to a Nash equilibrium in pure strategies of a certain <it>strictly competitive</it> game. A Nash equilibrium is shown to exist under very mild conditions, and the rate-adaptive waterfilling algorithm is demonstrated to give the optimal strategy in response to the WCI under a frequency-division (FDM) condition. Numerical results are presented for two important scenarios: an upstream VDSL deployment exhibiting the near-far effect, and an ADSL RT deployment with long CO lines. The results show that the performance improvement of DSM over SSM techniques in these channels can be preserved by appropriate distributed power control, even in worst-case interference environments.</p>http://dx.doi.org/10.1155/ASP/2006/78524 |
| spellingShingle | Brady Mark H Cioffi John M The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management EURASIP Journal on Advances in Signal Processing |
| title | The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management |
| title_full | The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management |
| title_fullStr | The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management |
| title_full_unstemmed | The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management |
| title_short | The Worst-Case Interference in DSL Systems Employing Dynamic Spectrum Management |
| title_sort | worst case interference in dsl systems employing dynamic spectrum management |
| url | http://dx.doi.org/10.1155/ASP/2006/78524 |
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