低轨高通量卫星按需波束调度技术

doi:10.11959/j.issn.2096-8930.2022018

Abstract

Abstract:

Low-orbit high-throughput satellite internet can satisfy the increasing speed and connection density requirements of end users and provide users with all-weather low-latency ultra-broadband communication services.At the same time, how to adapt to the fl exible and unevenly distributed terrestrial service requirements in low-orbit downlink scenarios and improve system throughput is an urgent problem to be solved.Based on the modeling of the beamforming architecture of the low-orbit highthroughput satellite downlink system and the satellite-to-earth fading of the low-orbit satellite and the inter-beam interference of the high-throughput satellite, the low-orbit high-throughput satellite downlink channel model was established.Based on the research of the high-throughput satellite on-demand beam scheduling scheme, the beam scheduling optimization problem model was established to ensured the utilization of resources, and the on-demand beam scheduling technology for high-throughput satellite internet was proposed, the method of using a small amount of beams to cover multiple cells by using on-demand time division multiplexing improved the utilization rate of resources, effectively suppressed the interference between beams, and improved the throughput of the system.

Key words: high throughput satellite, downlink system, beam scheduling

CLC Number:

TP393

Shuai HAN, Yihang WU, Jixi LI, Zuting CHEN, Siyue SUN, Guang LIANG. On-Demand Beam Scheduling Technology of Low-Orbit High-Throughput Satellite[J]. Space-Integrated-Ground Information Networks, 2022, 3(2): 28-38.

Figures/Tables 8

References 23

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参数	值
波束调度相关参数
卫星波束数K	18个
波束小区数N	37个
高优先级小区数N_priority	2个
地面小区流量需求分布T_n/(Mbit·s^-1)	T_n～M·U(100,1 000)
时延约束τ	0.2 s
系统公平性系数ρ	0.8
卫星通信场景参数
波束带宽B	500 MHz
卫星轨道高度L	600 km
3 dB波束宽度	4.6°
波束功率P_t	20 dBW
载波频率f_c	20 GHz
地面等效噪声温度T_noise	300 K
卫星发射天线增益G_t	50 dBi
移动终端天线增益G_r	0 dBi
频率复用方案	三色复用

On-Demand Beam Scheduling Technology of Low-Orbit High-Throughput Satellite

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