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| Paper: | SPCOM-P13.4 |
| Session: | DMT and xDSL |
| Time: | Friday, May 21, 15:30 - 17:30 |
| Presentation: |
Poster |
| Topic: |
Signal Processing for Communications: Multi-Carrier, OFDM, and DMT Systems |
| Title: |
ADAPTIVE BITRATE MAXIMIZING TEQ DESIGN FOR DMT-BASED SYSTEMS |
| Authors: |
Koen Vanbleu; Katholieke Universiteit Leuven | | |
| | Geert Ysebaert; Katholieke Universiteit Leuven | | |
| | Gert Cuypers; Katholieke Universiteit Leuven | | |
| Abstract: |
In a previous paper, we proposed a bitrate maximizing (BM) design criterion for the time-domain equalizer (TEQ) in a discrete multitone receiver. This BM-TEQ and the closely related BM per-group equalizers (PGEQ) get close to the performance of the so-called per-tone equalization (PTEQ). In this paper, we show that the BM-TEQ criterion, despite its nonlinear nature, is well suited for a recursive Levenberg-Marquardt (RLM) based design. This adaptive BM-TEQ also allows to track slow variations of transmission channel and noise. This RLM-based design uses the same second-order statistics (SOS) as the earlier presented recursive least-squares (RLS) based adaptive PTEQ and opens up a complete range of adaptive BM equalizers: from the computationally efficient RLS-based PTEQ with largest memory cost, over the RLM-based BM-PGEQ with intermediate memory cost, towards an RLM-based BM-TEQ with considerably smaller memory cost, but larger equalizer updating complexity. |
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