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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2021 Vol.22 No.6 P.790-801
Forward link outage performance of aeronautical broadband satellite communications
Abstract: High-throughput satellites (HTSs) play an important role in future millimeter-wave (mmWave) aeronautical communication to meet high speed and broad bandwidth requirements. This paper investigates the outage performance of an aeronautical broadband satellite communication system’s forward link, where the feeder link from the gateway to the HTS uses free-space optical (FSO) transmission and the user link from the HTS to aircraft operates at the mmWave band. In the user link, spot beam technology is exploited at the HTS and a massive antenna array is deployed at the aircraft. We first present a location-based beamforming (BF) scheme to maximize the expected output signal-to-noise ratio (SNR) of the forward link with the amplify-and-forward (AF) protocol, which turns out to be a phased array. Then, by supposing that the FSO feeder link follows Gamma-Gamma fading whereas the mmWave user link experiences shadowed Rician fading, we take the influence of the phase error into account, and derive the closed-form expression of the outage probability (OP) for the considered system. To gain further insight, a simple asymptotic OP expression at a high SNR is provided to show the diversity order and coding gain. Finally, numerical simulations are conducted to confirm the validity of the theoretical analysis and reveal the effects of phase errors on the system outage performance.
Key words: Aeronautical broadband satellite network, Free-space optical (FSO) transmission, High throughput mmWave communication, Outage probability, Phase error
1南京邮电大学通信与信息工程学院，中国南京市，210003
2中南大学计算机科学与工程学院，中国长沙市，410083
3紫金山实验室，中国南京市，210096
4康考迪亚大学电气与计算机工程系，加拿大蒙特利尔，QC H3G 1M8
摘要：高通量卫星系统可以满足未来高速率和大带宽的需求，在毫米波航空通信中扮演着重要角色。研究了航空宽带卫星通信系统前向链路的中断性能，其中从信关站到卫星的馈线链路使用自由空间光通信传输，从卫星到飞机的用户链路则在毫米波频段工作。特别地，在用户链路中，高通量卫星采用点波束技术，并在飞机上部署大型天线阵列。首先，在采用放大转发协议情况下，提出一种基于位置的波束成形方案，使得平均输出信噪比最大，并且此方案适用于相控阵。然后，假设馈电链路服从伽马-伽马分布，而用户链路经历阴影莱斯衰落，同时考虑相位误差影响，推导出系统的中断概率闭合表达式。为获得分集度和编码增益，进一步推导了高信噪比情况下的渐近中断表达式。最后，数值仿真验证了理论分析的有效性，并揭示相位误差对系统中断性能的影响。
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DOI:
10.1631/FITEE.2000445
CLC number:
TN92
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On-line Access:
2021-07-12
Received:
2020-08-31
Revision Accepted:
2021-02-01
Crosschecked:
2021-05-17