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12 July 2019 An adaptive coded transmission scheme utilizing frozen bits of polar code in satellite laser communications
K. Ito, E. Okamoto, H. Kunimori, M. Toyoshima
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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111805Y (2019) https://doi.org/10.1117/12.2536133
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece
Abstract
Free-space optical communication for a satellite-to-ground link using wideband 10-THz lasers can realize a higher capacity than radio frequency (RF) communications, and use downsized and energy-efficient components. Thus, satellite laser communication is expected to be used in new communication infrastructures. However, in wireless optical communication, problems such as disturbances due to atmospheric fluctuation and tracking/capturing errors of the laser beam occur, leading to a reduction in the received optical power. Thus, powerful channel coding is essential. On the other hand, it is strictly proven that polar code asymptotically reaches the channel capacity with sufficiently long code length. To obtain the excellent decoding characteristics of the polar code, it is necessary to adequately set frozen bits that are shared by the transmitter and the receiver, and an arbitrary code rate can easily be achieved by controlling the number of frozen bits. However, when considering the application of adaptive polar code to satellite laser communications, there are some difficulties in the transmission link such as large delays or received power fluctuation caused by air turbulence. Thus, it is difficult to realize an adaptive coding scheme for the channel with two-way information control. Therefore, in this paper, we propose a one-way adaptive polar coding scheme that estimates the transmission rate without requiring control information by superimposing code rate information into frozen bits, and estimating the code rate by decoding them at the receiver side. We evaluate the characteristics of this method using computer simulations.
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K. Ito, E. Okamoto, H. Kunimori, and M. Toyoshima "An adaptive coded transmission scheme utilizing frozen bits of polar code in satellite laser communications", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111805Y (12 July 2019); https://doi.org/10.1117/12.2536133
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KEYWORDS
Satellites
Receivers
Satellite communications
Laser communications
Transmitters
Signal to noise ratio
Computer programming
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