When power control is employed in a Ka-band LEO satellite system featured with a Markov channel, the long loop lag induces power control gaps during channel state transition, which results in long (large-scale) bursterrors. To combat it, a novel hybrid ARQ scheme is proposed in this paper, in which the side information of the turbo decoder is utilized to derive the average reliability LLRl of t...

High-accuracy Low Earth Orbit (LEO) satellite clock and orbital products are preconditions to realize LEO augmentation for high-accuracy GNSS-based positioning on the ground. There is a high correlation between orbit parameters in kinematic Precise Determination (POD) process. While future satellites planned be equipped with better clocks, benefits of modeling high-stability clocks not yet thor...

Several low earth orbit (LEO) satellite constellations have been proposed for mobile satellite systems (MSS’s). Due to nonstationary coverage regions of individual LEO satellites, the offered traffic load for each cell varies continuously. The variation of the traffic load essentially requires dynamic channel assignment. Furthermore, extremely frequent handover requests require specific techniq...

This paper presents an adaptive forward error correction (AFEC) protocol that provides a reliable communication service for real-time trafflc over low-earth orbit (LEO) satellite networks. In time-varying wireless links, such as LEO satellite networks, a reliable channel estimation scheme with an appropriate code selection technique is essential for adaptive error-control systems. This paper pr...

Satellite networks have been widely investigated both in the business and academia for many years, with many important routing algorithms reported in the literatures. However, fewer existing routing algorithms focus on the trade-off between the routing survivability and the routing computation and storage overheads. Due to topological dynamics, it is difficult to effectively apply the conventio...

This paper focuses on interference suppression aspects for DS/CDMA (Direct Sequence / Code Division Multiple Access) LEO (Low Earth Orbit) satellite communication systems. The interference of other users represents a serious problem for LEO satellite CDMA systems. The application of interference suppression systems is a promising approach to mitigate the multiuser problem. With the concentratio...

Abstract Positioning, Navigation and Timing (PNT) are services generally provided by Global Satellite Systems (GNSS). GNSS reside in medium to high orbital altitudes from the Earth’s surface, resulting weak signal reception. However, user applications increasingly need of higher power strength or alternative PNT solutions. An influx satellites Low Earth Orbit (LEO) driving such innovation techn...

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This paper presents studies for the end-to-end QoS of IP over integrated terrestrial and Next Generation Satellite Network (NGSN) using FTP. We compare between LEO and GEO satellites constellations for the QoS parameters (i.e. delay, jitter, loss rate and throughput) of file transfer from a remote server in London and a remote client in Boston. We model the file transfer with multiple connectio...