Title :
Capacity comparison of CDMA and FDMA/TDMA for a LEO satellite system
Author :
Fu, Hongyi ; Bi, Guoan ; Arichandran, K.
Author_Institution :
Center for Wireless Commun., Nat. Univ. of Singapore, Singapore
Abstract :
The system capacity determined by the outage probability of a multi-beam LEO system with CDMA and FDMA/TDMA is analyzed. In the case of CDMA, all possible multiple access interference is taken into account by a comprehensive interference analysis model including the effects of channel fading and shadowing, power control, practical spot beam antenna gains and imperfect equalization of the antenna pattern across a cell region. The results indicate that in LEO systems the CDMA capacity is significantly reduced because of the power control imperfections and the fact that multiple access interference is much more severe than that in terrestrial systems. A comparison with FDMA/TDMA shows that the capacity of an FDMA/TDMA system is comparable to a CDMA one for the LEO satellite systems
Keywords :
cellular radio; channel capacity; code division multiple access; fading channels; frequency division multiple access; mobile satellite communication; multibeam antennas; multiuser channels; power control; probability; radiofrequency interference; spread spectrum communication; telecommunication control; time division multiple access; CDMA capacity; FDMA/TDMA; LEO satellite system; LEO systems; antenna pattern; capacity comparison; cell region; cellular radio; channel fading; imperfect equalization; interference analysis model; multiple access interference; outage probability; power control; power control imperfections; shadowing; spot beam antenna gain; spread spectrum CDMA; terrestrial systems; Capacity planning; Fading; Frequency division multiaccess; Low earth orbit satellites; Multiaccess communication; Multiple access interference; Pattern analysis; Power control; Power system modeling; Time division multiple access;
Conference_Titel :
Communications, 1999. ICC '99. 1999 IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5284-X
DOI :
10.1109/ICC.1999.765441
