Title :
Accurate characterization of TWTA distortion in multicarrier operation by means of a correlation-based method
Author :
Aloisio, Marinella ; Casini, Enrico ; Angeletti, Piero ; Balague, Roger Oliva ; Colzi, Enrico ; Addio, Salvatore D.
Author_Institution :
RF Payload & Syst. Div., Eur. Space Agency ESA/ESTEC, Noordwijk
Abstract :
Complex payload architectures, together with the use of high-order digital modulations and advanced coding schemes, call for a new interpretation of the traveling-wave tube (TWT) linearity parameters. We propose a correlation-based methodology to assess in a simple, yet effective, manner the level of intermodulation (IM) generated by the TWT nonlinearity; this method is particularly suited to accurate IM evaluation in the presence of multicarrier operation with non-constant envelope modulations.
Keywords :
correlation methods; travelling wave amplifiers; TWTA distortion; complex payload architectures; correlation-based method; high-order digital modulation linearity parameters; multicarrier operation; nonconstant envelope modulations; Digital modulation; Frequency; Gaussian noise; High power amplifiers; Linearity; Modulation coding; Nonlinear distortion; Payloads; Power amplifiers; Signal to noise ratio; Communication satellites; high-order modulations; intermodulation; linearity; noise power ratio; traveling-wave Tube (TWT);
Conference_Titel :
Vacuum Electronics Conference, 2008. IVEC 2008. IEEE International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-1715-5
DOI :
10.1109/IVELEC.2008.4556373
