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Research Letters in Communications
Volume 2009, Article ID 457342, 4 pages
Research Letter

Energy Detection of Multilevel PAM Signals with Systematic Threshold Mismatch

VTT Technical Research Centre of Finland, P.O. Box 1000, 90571 Oulu, Finland

Received 3 December 2008; Accepted 13 February 2009

Academic Editor: Luca De Nardis

Copyright © 2009 Antti Anttonen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We address a symbol decision problem with spectrally efficient energy detected multilevel pulse amplitude modulated (PAM) signals. First, we analytically quantify the relationship between a systematic threshold mismatch and the required increase of the average signal-to-noise ratio to preserve a desired symbol error rate. For the case in which such an increase is not tolerable, we present a novel near-optimal multilevel threshold selection scheme, which is accurate for a wide range of system parameters.