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An adaptive adjustment strategy in the transmission of physical frame is proposed for a satellite communication system based on time division duplexing. The proposed strategy adaptively adjusts both superframe length and uplink synchronization time according to the subregion determined by the positions of all active users. Meanwhile, a transition procedure for physical frame adjustment is also designed...
A noval signal transmission method of asynchronous code division multiple access (CDMA) is proposed to improve the utilization of uplink timeslots for the time division duplexing (TDD) satellite communication systems. The terminals at different positions within a beam of the satellite antenna transmit their data blocks at different moments in the uplink timeslot window according to a certain rule...
The plan of constructing satellite communications system has been implementing in China since the miserable Wenchuan Earthquake in 2008. Several radio transmission technologies of terrestrial cellular systems are investigated to adapt to the satellite communications environment. In order to study the feasibility of TDD or HFDD satellite communications system compatible with TD-SCDMA standard, an analytical...
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