%0 Conference Paper %B IEEE International Conference on Communications (ICC) %D 2011 %T A Dirty Paper Scheme for Hierarchical OFDM %A Scagliola, Michele %A Fernando Pérez-González %A Guccione, Pietro %K dirty paper %K Hierarchical OFDM %K watermarking %B IEEE International Conference on Communications (ICC) %C Kioto, Japan %8 June %G eng %0 Journal Article %J IEEE Transactions on Communications %D 2011 %T Gain-Invariant Dirty Paper Coding for Hierarchical OFDM %A Scagliola, Michele %A Fernando Pérez-González %A Guccione, Pietro %K dirty paper %K dynacs %K Hierarchical OFDM %K watermarking %X

A novel approach is here presented to superimpose a low-priority data stream on a high-priority data stream for OFDM systems. The main improvement with respect to conventional hierarchical modulation, which is included with the same purpose in various wireless technologies, is that the low-priority data stream can be decoded from the received subcarrier symbols without any previous equalization for multipath fading channels. As a consequence, the expected performance is nearly invariant of the channel estimation method used to equalize the channel. The low-priority stream is inserted adopting a gain-invariant dirty paper coding based on Rational Dither Modulation, which was proposed for data hiding applications. In this paper an analysis of the developed system is presented and several simulations have been carried out using DVB-T system parameters to verify the validity of the proposed approach. The experimental results show the better performance of the proposed method with respect to that of a conventional hierarchical modulation, particularly when the accuracy of the estimated channel response decreases.

%B IEEE Transactions on Communications %V 59 %P 3323-3334 %8 December %G eng %R 10.1109/TCOMM.2011.101011.100544 %0 Conference Paper %B IEEE International Workshop on Information Forensics and Security (WIFS) %D 2009 %T AN EXTENDED ANALYSIS OF DISCRETE FOURIER TRANFORM - RATIONAL DITHER MODULATION FOR NON-WHITE HOSTS %A Scagliola, Michele %A Fernando Pérez-González %A Guccione, Pietro %K data hiding %K dither modulation %K filtering %K non-white Gaussian hosts %K watermarking %B IEEE International Workshop on Information Forensics and Security (WIFS) %I IEEE %C London, U.K. %8 December %G eng %0 Journal Article %J EURASIP Journal on Information Security %D 2009 %T High-rate data-hiding robust to linear filtering for colored hosts %A Scagliola, Michele %A Fernando Pérez-González %A Guccione, Pietro %K data-hiding %K rational dither modulation %K watermarking %B EURASIP Journal on Information Security %G eng