Title :
Probability of error in the return link of a CDMA mobile satellite system
Author :
Corazza, Giovanni E. ; De Gaudenzi, Riccardo
Author_Institution :
Dipartimento di Ingegneria Elettronica, Rome Univ., Italy
Abstract :
CDMA has been proposed as the multiple access technique for some future generation mobile satellite systems at the L-band. To enhance the coverage and the quality of service non-geostationary constellations are envisaged. This implies the presence of a large Doppler effect that combined with frequent mobile channel shadowing makes the uplink closure for handheld terminals a very challenging task. In this paper the performance of M-ary orthogonal convolutionally coded DS-CDMA is analyzed in depth and its performance compared to the simpler coded differential BPSK scheme. The bit error rate bounds with or without satellite diversity and equal gain combining are evaluated over typical LEO satellite fading channels. Different coding rates and soft metrics are considered to optimize the channel performance
Keywords :
Doppler effect; code division multiple access; convolutional codes; diversity reception; error statistics; fading; land mobile radio; mobile satellite communication; multipath channels; probability; pseudonoise codes; satellite links; spread spectrum communication; CDMA mobile satellite system; Doppler effect; L-band; LEO satellite fading channels; M-ary orthogonal convolutionally coded DS-CDMA; bit error rate bounds; channel performance; coding rates; frequent mobile channel shadowing; future generation mobile satellite systems; handheld terminal; multiple access technique; nongeostationary constellations; performance; qual gain combining; return link; satellite diversity; soft metrics; uplink closure; Binary phase shift keying; Convolutional codes; Diversity reception; Doppler effect; L-band; Multiaccess communication; Performance analysis; Quality of service; Satellites; Shadow mapping;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501521
