Evolution of Space TWT Requirements and Specifications for Modern Communication Satellites

Author

Aloisio, Marinella ; Casini, Enrico ; Ginesi, Alberto ; Waller, Pierre

Author_Institution

RF Payload Syst. Div., Eur. Space Agency

fYear

0

fDate

0-0 0

Firstpage

59

Lastpage

60

Abstract

Complex, non-constant envelope, high order digital modulation schemes used in modern communication satellites bring new requirements for the linearity and power efficiency of the traveling-wave tubes (TWT). As a result, a reassessment of the typical TWT specifications is in order. A digital system-level figure-of-merit, the total degradation (TD), is proposed. It accounts for the characteristics of any coded digital system and the performance of the overall communication link, including co-channel and adjacent channel interference. This figure-of-merit allows re-optimizing the operating point of currently used TWTs, comparing the end-to-end performance of different tubes and revising the standard TWT linearity-versus-efficiency requirements

Keywords

adjacent channel interference; satellite communication; travelling wave tubes; TWT specifications; adjacent channel interference; cochannel interference; coded digital system; communication satellites; digital modulation schemes; space travelling wave tubes; total degradation; Artificial satellites; Degradation; Digital modulation; Digital systems; Digital video broadcasting; Interchannel interference; Linearity; Modulation coding; Radio frequency; Satellite broadcasting; Communication satellites; Total Degradation (TD); Traveling-wave Tube (TWT); efficiency; high order digital modulation schemes; linearity; optimization;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2006 held Jointly with 2006 IEEE International Vacuum Electron Sources., IEEE International

Conference_Location

Monterey, CA

Print_ISBN

1-4244-0108-9

Type

conf

DOI

10.1109/IVELEC.2006.1666183

Filename

1666183