Title :
Performance estimation and design of group demodulator for satellite FDMA/TDM transmission
Author :
Loo, Chun ; Umehira, Masahiro
Author_Institution :
Dept. of Commun., Ottawa, Ont., Canada
Abstract :
The authors describe a Monte Carlo simulation of QPSK (quadrature phase shift keying) and offset QPSK group modems which take into account the effect of the nonlinearity of each ground terminal HPA. The effect of uplink fading due to rain, as encountered in satellite links operated in the Ka and Ku bands, is included. Results show that a normalized channel spacing with respect to a symbol rate of 2.5 or greater is required to reduce the effect of adjacent channel interference. At this spacing the performance of the model will still incur a Eb/N0 (energy per bit/noise density) degradation of about 1.0 dB. In addition, design criteria for major components such as digital subfilter, rate conversion filter, carrier recovery circuits, and quantization are given
Keywords :
Monte Carlo methods; demodulators; error statistics; frequency division multiple access; modems; phase shift keying; satellite relay systems; time division multiplexing; Ka band; Ku bands; Monte Carlo simulation; SHF; adjacent channel interference; bit error probability; carrier recovery circuits; design criteria; digital subfilter; ground terminal HPA; group demodulator; group modems; high power amplifier nonlinearity; normalized channel spacing; offset QPSK; quadrature phase shift keying; quantization; rain; rate conversion filter; satellite FDMA/TDM transmission; satellite links; uplink fading; Channel spacing; Circuit noise; Degradation; Demodulation; Digital filters; Interchannel interference; Modems; Quadrature phase shift keying; Rain fading; Satellites;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64129
