| 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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