Title :
A SAW-based group demodulator for onboard processing in communications satellites
Author :
Shaw, Michael D. ; Loo, Chun ; Wong, Eric C W
Author_Institution :
COM DEV Ltd., Cambridge, Ont., Canada
Abstract :
An experimental 24-channel multicarrier (64-kb/s bit rate for each carrier) group demodulator using surface acoustic wave (SAW) chirp Fourier transform (CFT) processing is described. The demodulated data are combined into a single time division multiplexing (TDM) bit stream at the standard T1 rate of 1.544 Mb/s. Measured data on this M unit demonstrate superior performance (40-dB sidelobe suppression, 0.34-dB combined interference degradation), inherent reliability, and power efficiency of SAW technology when processing a large number of channels over wide bandwidths. This unit will be tested further using the Olympus satellite in a double-hop mode
Keywords :
Fourier transforms; demodulators; satellite relay systems; signal processing; surface acoustic wave devices; 1.544 Mbit/s; 64 kbit/s; SAW group demodulator; T1 rate; TDM; bandwidths; bit stream; chirp Fourier transform; communications satellites; interference degradation; measured data; onboard processing; power efficiency; reliability; sidelobe suppression; surface acoustic wave; time division multiplexing; Acoustic measurements; Acoustic waves; Bit rate; Chirp; Demodulation; Fourier transforms; Interference suppression; Power measurement; Surface acoustic waves; Time division multiplexing;
Conference_Titel :
Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-87942-697-7
DOI :
10.1109/GLOCOM.1991.188591
