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Adaptive Waveforms for Multimedia Satellite Applications in Ka Band Based on Continuous Phase Modulation

Abstract : The Present thesis deals with the uplink in future satellite communication systems for multimedia applications in Ka band. More precisely we are concerned by the design of an adaptive waveform to cope with the stringent propagation conditions in Ka band. Such waveform will provide higher system capacity by adopting spectral efficient waveform at clear sky propagation. It will also improve system availability by selecting power efficient waveform during fading events. CPM based waveform is adopted as a solution for the waveform design. Motivations are the followings: First, constant envelope signals allow us to operate user terminal amplifier near saturation which provide higher power efficiency. Secondly, high power performances are obtained when CPM is serially coded with convolutional code with iterative decoding. Finally, waveform parameters diversity (modulation order, modulation index, pulse shape - ) is very helpful to design an adaptive waveform. The proposed adaptive waveform is mainly based on the modulation index variation while keeping the same denominator. This solution leads to the same receiver structure and complexity, it require, however, a specific filter banc associated to each modulation index. Three CPM schemes with different modulation indexes are considered: the binary 3RC, the quaternary 2RC and the octal 2RC. Simulation results show that binary scheme is more efficient at low Eb/N0 . However quaternary and octal CPM offer higher spectral efficiency during favorable propagation conditions. Therefore, those schemes seem to be more suitable for adaptive waveform. The octal 2RC is particularly an attractive scheme, it requires, higher complexity
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Submitted on : Thursday, February 3, 2005 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:27:29 PM


  • HAL Id : pastel-00000988, version 1



Ridha Chaggara. Adaptive Waveforms for Multimedia Satellite Applications in Ka Band Based on Continuous Phase Modulation. domain_other. Télécom ParisTech, 2004. English. ⟨pastel-00000988⟩



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