Distance Spectra for Trellis Coded Modulation Schemes on Channels with Intersymbol Interference

Authors : Sabire Haciömeroğlu And Melek D. YÜCEL

Pages : 111-123

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The effect of intersymbol interference on distance spectra for trellis coded 8-PSK, 16-QAM and 32-AMPM modulation schemes is evaluated using the methods proposed by Schlegel. Distance spectra of 16-state 8-PSK scheme are computed for different intersymbol interference channels. It is seen that on channels with intersymbol interference the spectral lines are spread into a nearly continuous spectrum and the minimum Euclidean distance between codewords decreases severely. Hence, although the main contribution at large signal to noise ratios comes from the minimum Euclidean distance insert ignore into journalissuearticles values( dfree ); , higher spectral components also become very important at moderate values of the signal to noise ratio.
Keywords : Trellis Coded Modulation, Distance Spectrum, Intersymbol Interference