A deep analysis of discrete Fourier transform - rational dither modulation (DFT-RDM), developed to cope with linear time invariant filtering, is here presented. This study has been motivated by the significant increase of the error probability suffered by DFT-RDM for non-white hosts, in spite of the low bit-error rate achieved for white hosts under the same attack filter. The theoretical analysis of DFT-RDM has been generalized to non-white Gaussian hosts providing an explanation to the measured performance degradation. Afterwards an extension of DFT-RDM, named whitened DFT-RDM, is proposed to achieve the same bit-error rates for white and non-white Gaussian hosts. Experimental results are also presented that validate the developed analysis and illustrate the performance enhancement provided by the proposed extension of DFT-RDM, with both non-white Gaussian signals and real audio clips.
|Titolo:||An extended analysis of discrete Fourier Transform –Rational Dither Modulation for non-white hosts|
|Data di pubblicazione:||2009|
|Nome del convegno:||2009 First IEEE International Workshop on Information Forensics and Security (WIFS)|
|Digital Object Identifier (DOI):||10.1109/WIFS.2009.5386466|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|