Performance of CDMA-ALOHA in shadowed mobile satellite and stratospheric platform channels

Performance of mobile satellite communication in stratospheric platform along with low Earth orbit and quasi zenith satellite channels are examined. The throughput performance of mobile satellite communications using the slotted and unslotted CDMA-ALOHA systems is studied. Computer simulation is carried out using measured propagation data, and throughput performance for the different propagation characteristics is compared. The packet delay performance is also evaluated along with the altitude of satellite when ARQ (automatic repeat request.) scheme is introduced for error control. This paper studies the effect of transmission control of packets following the channel state monitor to improve throughput performance in measured land mobile satellite channels.