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The high peak-to-average power ratio (PAR) in Orthogonal Frequency Division Multiplexing (OFDM) modulation systems can significantly reduce power efficiency and performance. Methods exist which alter or introduce new signal constellations to combat large signal peaks. We present a new PAR-reduction method that dynamically extends outer constellation points in active (data-carrying) channels, within margin-preserving constraints, in order to minimize the peak magnitude. This schemedoi:10.1109/icassp.2003.1202695 dblp:conf/icassp/KrongoldJ03 fatcat:qwcvo4ytfjbkln6fhah6nwe5lu