Title :
SSMA and spread FDMA transmission through a nonlinear satellite channel
Author :
Sampaio-Neto, Raimundo ; Albuquerque, José Paulo A
Author_Institution :
Center for Studies in Telecommun., Pontificia Universidade Catolica, Rio de Janeiro, Brazil
Abstract :
The authors analyze and compare two possible access schemes, spread-spectrum multiple access (SSMA) and frequency-division multiple access (FDMA) to be used in satellite networks with a large number of small users. For FDMA, it is assumed that individual carriers are also spread, to the extent that the available bandwidth is always fully occupied. Spectral efficiencies are computed and compared for transmission through a nonlinear satellite channel in the presence of thermal noise and external interference, in addition to the self-interference that is intrinsic to the SSMA system. Optimum operating points for the nonlinear amplifier are also determined. As for the linear channel, spread FDMA shows higher efficiency than SSMA for the nonlinear channel
Keywords :
frequency division multiple access; multi-access systems; satellite relay systems; spread spectrum communication; telecommunication channels; SSMA; external interference; frequency-division multiple access; nonlinear amplifier; nonlinear satellite channel; optimum operating points; self-interference; spectral efficiencies; spread FDMA transmission; spread-spectrum multiple access; thermal noise; Bandwidth; Binary phase shift keying; Error probability; Frequency division multiaccess; Interference; Noise figure; RF signals; Satellites; Sections; White noise;
Conference_Titel :
Communications, 1989. ICC '89, BOSTONICC/89. Conference record. 'World Prosperity Through Communications', IEEE International Conference on
Conference_Location :
Boston, MA
DOI :
10.1109/ICC.1989.49747
