Quasi-synchronous CDMA in low earth orbit satellite systems through rails using spread spectrum communication

摘要

In the multimedia communication with Low Earth Orbit satellites, it is enable to suppress co-channel interference and access multiply with quasi-synchronous CDMA which makes the code synchronization easy, if the positioning information of satellites and mobile terminals can be obtained. In this paper, it is considered about influence of the positioning accuracy for the chip rate of the spreading code and data rate in the case of composing the quasi-synchronous CDMA system, and about the property which spreading code must have like the Zero-correlation Zone.