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This paper combines the design philosophies of synchronous and asynchronous, online and offline interactive teaching and learning environments to create a long-distance real-time educational support system based on intelligent perception (i-percieve), intelligent manageability (i-manage), intelligent interactive feedback (i-feedback), smart displays (i-view) and other core technologies. In addition...
Because of the environment and the nature of the signal itself, GPS or wireless mobile positioning technology always has any unavoidable defect. But higher coverage percentage, reliability or precision than single positioning can be gained if integrating at least two positioning technologies' advantages and avoiding their deficiencies. So the developmental trend of mobile positioning technology is...
In GEO (Geostationary Earth Orbit) mobile satellite system, subscribers could not be paged when the MES (Mobile Earth Station) is normally out of coverage area due to additional propagation path losses. To alert the subscribers in such situation, a more penetrative and computationally efficient coding modulation is needed. In this paper two kinds of orthogonal coded modulation, which are 6PSK based...
AODV routing protocol is a classical protocol in Ad Hoc network. The scientists have already conducted the extensive research. In order to perfect the protocol, an improved protocol LAODV is proposed in this paper, which has two improvements. One improvement is that LAODV involves a delayed algorithm based on node state. It adopts a novel delayed broadcast scheme which combines the shortest route...
For the problem in the route discovery process of AOMDV route protocol: lacking congestion control leads to the inappropriate main path selected by source node in many cases, this paper proposes an improved protocol which is based on the traffic load and location information of the network. In the route discovery process, the relay node adopts a delay algorithm before broadcasting RREQ message. So...
HMIPv6(Hierarchical Mobile IPv6) adopts hierarchical architecture to manage the communication between mobile node(MN) and correspondent node(CN) by introducing a mobility anchor point(MAP) so that it may greatly reduce signaling cost during MN movement. However, it also brings about some new problems, one of which is the issue of the route. When a MN moves to some special location, there maybe exists...
This paper shows us the coverage performance and Doppler shift of the IGSO constellation with 2, 3 or 4 satellites, and then contrasted with the GEO satellite. The IGSO constellation is better than GEO satellite in average elevation angle and multi-satellite coverage. It is concluded after simulation and analysis that the IGSO constellation with 3 or 4 IGSO satellites can provide higher coverage performance...
Power control is an important issue in mobile communication systems and has been studied extensively in the literature. This paper has taken on a new perspective and modeled the problem as a state estimation problem with finite communication constraints. The problem is solved by using the 1-bit mean coder-estimator sequence. The performance of the coder-estimator sequence is compared with that of...
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