CDMA truy cập và chuyển mạch P7
lượt xem 14
download
Network Access and Synchronization Overview As we have described in Chapters 3 and 6, the SS/CDMA uses orthogonal CDMA in both uplink and downlink. The orthogonal CDMA can reject the interference between the user traffic channels and thus maximize the system capacity. However, the use of orthogonal CDMA in the uplink requires a network-wide synchronization of all satellite receptions (global synchronization). The accuracy of the synchronization at steadystate and the speed at which synchronization is acquired depends on the propagation environment, i.e. the channel condition, the mobility of the end user, the propagation delay, etc....
Bình luận(0) Đăng nhập để gửi bình luận!
CÓ THỂ BẠN MUỐN DOWNLOAD