Title :
Accurate Characterization of TWTA Distortion in Multicarrier Operation by Means of a Correlation-Based Method
Author :
Aloisio, Marinella ; Angeletti, Piero ; Casini, Enrico ; Colzi, Enrico ; D´Addio, Salvatore ; Oliva-Balague, Roger
Author_Institution :
Eur. Space Res. & Technol. Centre (ESA/ESTEC), Eur. Space Agency, Noordwijk
fDate :
5/1/2009 12:00:00 AM
Abstract :
Complex payload architectures, together with the use of high-order digital modulations and advanced coding schemes, call for an accurate evaluation of traveling-wave tube amplifier (TWTA) nonlinearity impairments. To assess in a simple yet accurate manner the level of signal distortion generated by the TWTA nonlinearity, we adopt a correlation-based methodology. The proposed method provides an accurate evaluation of the TWTA intermodulation, particularly in the presence of multicarrier operation with nonconstant envelope modulations.
Keywords :
correlation methods; intermodulation distortion; travelling wave amplifiers; higher-order modulation; intermodulation distortion; noise power ratio; output back off; signal distortion; traveling-wave tube amplifier; AWGN; Digital modulation; Energy consumption; Intermodulation distortion; Linearity; Operational amplifiers; Payloads; Power amplifiers; Satellites; Space technology; Communications satellites; high-order modulations; intermodulation (IM) distortion; noise power ratio (NPR); output back-off (OBO); traveling-wave tube (TWT);
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2009.2016128
