PSD-constrained PAR reduction for DMT/OFDM

Authors:
Niklas Andgart;Brian S. Krongoldc;Per Ödling;Albin Johansson;Per Ola Börjesson
Affiliations:
Signal Processing Group, Department of Information Technology, Lund University, Lund, Sweden;Australian Research Council (ARC) Special Research Centre for Ultra-Broadband Information Networks, University of Melbourne, Victoria, Australia;Signal Processing Group, Department of Information Technology, Lund University, Lund, Sweden;Ericsson AB, Stockholm, Sweden;Signal Processing Group, Department of Information Technology, Lund University, Lund, Sweden
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2004

Citing 2
Cited 2

Understanding digital subscriber line technology

Understanding digital subscriber line technology
An active-set approach for OFDM PAR reduction via tone reservation

IEEE Transactions on Signal Processing

A low complexity multicarrier PAR reduction approach based on subgradient optimization

Signal Processing - Special section: Multimodal human-computer interfaces
Designing tone reservation PAR reduction

EURASIP Journal on Applied Signal Processing

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Abstract

Common to all DMT/OFDM systems is a large peak-to-average ratio (PAR), which can lead to low power efficiency and nonlinear distortion. Tone reservation uses unused or reserved tones to design a peak-canceling signal to lower the PAR of a transmit block. In DMT ADSL systems, the power allocated to these tones may be limited due to crosstalk issues with many users in one twisted pair bundle. This PSD limitation not only limits PAR reduction ability, but also makes the optimization problem more challenging to solve. Extending the recently proposed active set tone reservation method, we develop an efficient algorithm with performance close to the optimal solution.