Performance Analysis of M-ary Optical Communication over Log-Normal Fading Channels for CubeSat Platforms

IF 0.6 Q4 ASTRONOMY & ASTROPHYSICS

Journal of Astronomy and Space Sciences Pub Date : 2020-12-01 DOI:10.5140/JASS.2020.37.4.219

H. Lim, Sung-Yeol Yu, Ki-Pyoung Sung, J. Park, C. Choi, Mansoo Choi

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引用次数: 1

Abstract

A CubeSat platform has become a popular choice due to inexpensive commercial off-the-shelf (COTS) components and low launch cost. However, it requires more power-efficient and higher-data rate downlink capability for space applications related to remote sensing. In addition, the platform is limited by the size, weight and power (SWaP) constraints as well as the regulatory issue of licensing the radio frequency (RF) spectrum. The requirements and limitations have put optical communications on promising alternatives to RF communications for a CubeSat platform, owing to the power efficiency and high data rate as well as the license free spectrum. In this study, we analyzed the performance of optical downlink communications compatible with CubeSat platforms in terms of data rate, bit error rate (BER) and outage probability. Mathematical models of BER and outage probability were derived based on not only the log-normal model of atmospheric turbulence but also a transmitter with a finite extinction ratio. Given the fixed slot width, the optimal guard time and modulation orders were chosen to achieve the target data rate. And the two performance metrics, BER and outage data rate, were analyzed and discussed with respect to beam divergence angle, scintillation index and zenith angle.

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立方体卫星平台对数正态衰落信道上的m - ry光通信性能分析

由于廉价的商用现货(COTS)组件和较低的发射成本，CubeSat平台已成为一种流行的选择。但是，与遥感有关的空间应用需要更节能和更高数据速率的下行链路能力。此外，该平台还受到尺寸、重量和功率(SWaP)限制以及射频(RF)频谱许可的监管问题的限制。由于功率效率和高数据速率以及免许可频谱，这些要求和限制使光通信成为CubeSat平台上射频通信的有希望的替代方案。在本研究中，我们从数据速率、误码率(BER)和中断概率方面分析了与CubeSat平台兼容的光下行通信性能。基于大气湍流的对数正态模型和有限消光比发射机，建立了误码率和中断概率的数学模型。在一定的时隙宽度下，选择最佳的保护时间和调制顺序以达到目标数据速率。并从波束发散角、闪烁指数和天顶角三个方面对误码率和中断数据率两个性能指标进行了分析和讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-

CiteScore

1.30

自引率

20.00%

发文量

审稿时长

12 weeks

期刊介绍： JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.