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The uplink capacity of GEO satellite mobile communication system compatible with TD-SCDMA is presented in this paper. An analysis on the interference and system capacity in the specific system is made according to the multi-beam model based on HFDD. Verified by simulation, the analysis not only provides a theoretical foundation for network planning of satellite system based on TD-SCDMA in terms of...
Adaptive Modulation and Coding (AMC) is one of the most promising techniques to cope with the dynamic fading of wireless channels, adopted by emerging standards such as LTE and WiMAX. In satellite communications, the upper bound of AMC adjustment period is determined by both long round-trip delay and different channel coherence time. In this paper, the impact of AMC adjustment period in mobile satellite...
In mobile satellite communication systems, Doppler shift is caused by the movement of both unified equipment and satellite, and differs from that in terrestrial mobile communication. Therefore, in OFDM based mobile satellite communication systems, the selection of sub-carrier bandwidth should be different. In this paper, the characteristic of Doppler shift in the satellite communication is analyzed,...
LTE-based mobile satellite communication system is a combination of terrestrial LTE system and satellite communication techniques, which aims at improving the current LTE system's technical specifications for better service quality. AMC (Adaptive Modulation and Coding) technique is applied in current LTE system to improve system capacity and data transmission efficiency. CQI (Channel Quality Indicator),...
In this paper, a new compensation scheme for timing deviation is proposed in the SCDMA mobile satellite communication system. Instead of adjusting the timing deviation directly, the scheme adjusts the timing deviation according to the timing deviation of the current period and the last period. Simulation results show that the proposed scheme performs better than the traditional scheme.
A three-layer interleaver scheme, which is added into TD-SCDMA specification for the compatibility with satellite environment, is proposed for 3G mobile satellite communication systems. Simulation results for satellite channel are presented, which demonstrate that the third interleaver can improve the system performance significantly and satisfy the demands. The proposed interleaver design also provides...
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...
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