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Performance of serially coded binary and quaternary CPM (continuous phase modulations) with iterative decoding are explored. Such system shows high power performance when reasonable interleaver sizes (less than 1024) are considered. The effect of the modulation index variation on waveform efficiency is emphasized. Effect of ACI (adjacent channel interference) on waveform performance is also assessed. Simulation results will represent a guideline to select the best fitted CPM for future satellite communications systems in Ka band. The choice takes into account power and spectral performance, complexity as well as adaptive aspects. The latter criterion is justified by the significant channel fluctuations in Ka band. In such circumstances, non adaptive waveform leads automatically either to a non efficient channel exploitation or weak system availability.