Title :
Comparison of CDMA and FDMA/TDMA in non-GEO satellite systems
Author :
Ichikawa, Naoki ; Katayama, Masaaki ; Okada, Hiraku ; Yamazato, Takaya ; Ogawa, Akira
Author_Institution :
Dept. of Inf. Electron., Nagoya Univ., Japan
Abstract :
We compare CDMA and FDMA (or TDMA) schemes in multibeam non-geostationary satellite systems, taking the effects of antenna patterns on inter-cell interference into consideration. The maximum acceptable number of users per cell in the uplink is employed as a measure of the system capacity. We have found that in FDMA (or TDMA) systems the maximum acceptable number of users varies according to the altitude of the satellites. While the performance is insensitive to the altitude in CDMA systems. For this reason, the altitude of the satellites is found to be an important factor for selecting multiple access schemes in non-geostationary satellite systems
Keywords :
antenna radiation patterns; cellular radio; code division multiple access; frequency division multiple access; mobile satellite communication; satellite communication; time division multiple access; CDMA; FDMA/TDMA; antenna patterns effect; inter-cell interference; maximum acceptable number of users; multibeam satellite systems; multiple access schemes; nonGEO satellite systems; nongeostationary satellite systems; satellite altitude; system capacity; Antenna measurements; Antenna radiation patterns; Base stations; Frequency division multiaccess; Information science; Interference; Low earth orbit satellites; Multiaccess communication; Satellite antennas; Time division multiple access;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937256
