Uplink User Power Control for Low-Orbit Satellite Communication Systems

Li, Hui; Yang, Guan Qing

doi:10.1109/compcomm.2018.8781042

Cited by 3 publications

(1 citation statement)

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“…Future mobile communication systems must be better suited to serve a variety of developing applications in environments with high levels of mobility, including loworbit satellites, manned and unmanned aircraft, manned and unmanned vehicles, and high-speed trains [1][2][3]. In these high-mobility scenarios, mobile channels exhibit the characteristics of doubly dispersive channels due to the influence of the Doppler effect and the multipath propagation effect.…”

Section: Introductionmentioning

confidence: 99%

A Structured Sparse Bayesian Channel Estimation Approach for Orthogonal Time—Frequency Space Modulation

Zhang

Yang

et al. 2023

Entropy

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Orthogonal time–frequency space (OTFS) modulation has been advocated as a promising waveform for achieving integrated sensing and communication (ISAC) due to its superiority in high-mobility adaptability and spectral efficiency. In OTFS modulation-based ISAC systems, accurate channel acquisition is critical for both communication reception and sensing parameter estimation. However, the existence of the fractional Doppler frequency shift spreads the effective channels of the OTFS signal significantly, making efficient channel acquisition very challenging. In this paper, we first derive the sparse structure of the channel in the delay Doppler (DD) domain according to the input and output relationship of OTFS signals. On this basis, a new structured Bayesian learning approach is proposed for accurate channel estimation, which includes a novel structured prior model for the delay-Doppler channel and a successive majorization–minimization (SMM) algorithm for efficient posterior channel estimate computation. Simulation results show that the proposed approach significantly outperforms the reference schemes, especially in the low signal-to-noise ratio (SNR) region.

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Section: Introductionmentioning

confidence: 99%

A Structured Sparse Bayesian Channel Estimation Approach for Orthogonal Time—Frequency Space Modulation

Zhang

Yang

et al. 2023

Entropy

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Research on Low Earth Orbit Satellite Positioning Technology Based on Time Difference Measurement

Ma,

Zhang,

Huang

et al. 2024

Lecture Notes in Electrical Engineering

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Game theory based maritime area detection for cloud-edge collaboration satellite network

Li,

Wang,

et al. 2024

Front. Phys.

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Maritime area detection technology applies equipment such as high-orbit satellites, gateway ships and Unmanned Aerial Vehicles to detection. In this scenario, real-time uploading and analysis of maritime data is crucial. In the existing scenario, UAV data are gathered to the gateway ship and uploaded to the shore-based cloud via the high-orbit satellite, because the communication distance of the high-orbit satellite is far, and when the uploaded data volume is large or the access to the equipment increases, the propagation delay of the uploading of the data from the gateway ship to the satellite and the forwarding of the data from the satellite to the shore-based cloud is longer, and the processing delay of the shore-based cloud is increased, and the efficiency of the data transmission and communication will be affected as well. Aiming at the problem of increasing delay caused by communication limitations in maritime area detection, this paper proposes a maritime area detection scheme based on cloud-side collaboration. The scheme solves the problem of communication limitation from the following two aspects. First, the edge computing nodes are deployed on the ship side of the gateway, and the optimal offloading ratio is sought through game theory to offload a part of the tasks from the center cloud to the edge cloud for processing, which improves the efficiency of processing data and thus reduces the data transmission latency and data processing delay. Secondly, low-orbit (LEO) satellites are introduced to provide communication services, because low-orbit satellites have low orbital altitude and short propagation delay, which can transmit the data at the gateway ship to the shore-based cloud more quickly and improve the data transmission efficiency. Finally, it is also verified by designing experiments that the proposed scheme adopts the optimal offloading ratio and has a lower total delay than the original scheme, thus proving the effectiveness of the proposed scheme.

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Uplink User Power Control for Low-Orbit Satellite Communication Systems

Cited by 3 publications

References 0 publications

A Structured Sparse Bayesian Channel Estimation Approach for Orthogonal Time—Frequency Space Modulation

A Structured Sparse Bayesian Channel Estimation Approach for Orthogonal Time—Frequency Space Modulation

Research on Low Earth Orbit Satellite Positioning Technology Based on Time Difference Measurement

Game theory based maritime area detection for cloud-edge collaboration satellite network

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