Research Of MAC Protocol In Intersatellite Optical CDMA Communication

Having high quality in high-capacity, anti-jamming, privacy etc, intersatellite optical CDMA communication technology is promising. As the address code, code or encode multi-user detecting etc developing, it's impossible to use optical CDMA technology into intersatellite communication. This dissertation does research on the problem.In intersatellite optical communication , Media Access Control (MAC) is a key issue, which determines network performance,bandwidth efficiency, complexity and cost of terminal. Aiming at this issue, on the base of an in-depth study on existing MAC protocols, this thesis exploringly researched on MAC protocols in intersatellite optical communication network. The main results are as follows:Firstly, by calculating parameters including the link length, the azimuth angle, the elevation, the optical power that the intersatellite optical CDMA communication system will receive, the variation range of the azimuth angle and the elevation from the optical antenna of PAT are understood well.Secondly, based on different services in network, I constructed single-length and multi-length OOC. The performance of single-length and multi-length OOC in intersatellite optical communication CDMA system were analyzed in detail.Thirdly, several kind of typical MAC protocols in network were analyzed. Investigating and comparing the characteristics among TDMA, WDMA, CDMA; Random multiple protocols such as Aloha were analyzed.Finally, I investigated the framework and Slotted Aloha-CDMA multiple protocols was analyzed too. The network throughput for slotted Aloha- CDMA protocol was derived and analyzed. Aiming at the issue that network has low throughput at high offered payload, this thesis put forward Modified Channel Load Sensing Protocol (MCLSP), and the proposed protocol was proved effective in improving network throughput.