Title :
Suppression of interferences over SATCOM links with transparent transponders
Author :
Kohl, Marcel ; Wiesler, Anne ; Jondral, Riedrich
Author_Institution :
DAST, Defense & Civil Syst., Ulm, Germany
Abstract :
In today´s SATCOM systems transparent transponders are widely used. This device is the most vulnerable component of the whole system. Signals which are received accidentally or introduced intentionally into the transponder band will be retransmitted, generating IM products and therefore reducing the available energy to the user signal. It is shown, that the bandwidth spreading of the user signal reduces the vulnerability. Two techniques, frequency hopping (FH) and direct sequence spread spectrum (DS-SS), are considered
Keywords :
error statistics; frequency hop communication; interference suppression; intermodulation; pseudonoise codes; radiofrequency interference; satellite communication; spread spectrum communication; transponders; travelling wave amplifiers; BER; DS-SS; IM products; QPSK signal; TWTA; bandwidth spreading; direct sequence spread spectrum; frequency hopping; interference suppression; nonlinear behaviour; satellite communication systems; transparent transponders; transponder band; user signal; Bandwidth; Bit error rate; Degradation; Downlink; Frequency; Interference suppression; Quadrature phase shift keying; Spread spectrum communication; Transmitters; Transponders;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-3871-5
DOI :
10.1109/PIMRC.1997.627041
