2024-09-12 プリンストン大学
Low Earth orbit satellites could soon offer millions of people worldwide access to high-speed communications. Now, researchers have invented a technique that enables these satellites’ antennas to manage signals for multiple users at once, making them cheaper and simpler to design and launch. Image by Adobe Stock
＜関連情報＞
- https://engineering.princeton.edu/news/2024/09/12/simple-shift-could-make-low-earth-orbit-satellites-high-capacity
- https://ieeexplore.ieee.org/document/10545600
複数の低軌道衛星との通信のための物理的ビーム共有 Physical Beam Sharing for Communications With Multiple Low Earth Orbit Satellites
Yan-Yin He; Shang-Ho Tsai; H. Vincent Poor
IEEE Transactions on Signal Processing Published:03 June 2024
DOI:https://doi.org/10.1109/TSP.2024.3408061
Abstract
Physical (analog) beamforming is expected to become an important technique in Low Earth Orbit (LEO) satellite transmission in upcoming 6G communications. To build dense networks via LEO satellites and decrease deployment expenses, the corresponding satellites should have minimal hardware, low computational complexity, and limited power consumption. Additionally, issues such as different propagation delays, Doppler effects, long feedback delays, and serious attenuation caused by bad weather should also be addressed in LEO satellite communications. This work proposes a novel physical beam sharing scheme for multiple-satellite systems that enables a satellite to simultaneously serve multiple users using only one Radio-Frequency (RF) chain, consequently leading to a significant reduction in hardware complexity and power consumption. In this case, all users can achieve full multiplexing gain. Furthermore, we propose two ways of optimizing for this novel scheme. One is maximizing the throughput of all users, and the other is minimizing the LEO satellite system’s power consumption. For the problems, we propose both solutions using instantaneous Channel State Information (iCSI) and long-term statistical Channel State Information (sCSI). Simulation results demonstrated that the proposals significantly outperform conventional schemes in terms of throughput and power consumption, and the performance of the proposed sCSI solutions is close to that of iCSI ones.
