Robust Adaptive Margin for ACM in Satellite Links at EHF Bands
Robust Adaptive Margin for ACM in Satellite Links at EHF Bands
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DOI：
10.1109/lcomm.2019.2949273
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发表时间：
2020-01-01
期刊：
影响因子：
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通讯作者：
Evans, Barry
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文献类型：
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作者：
Ekerete, K'ufre-Mfon;Awoseyila, Adegbenga;Evans, Barry
使用自适应编码和调制来抵消雨衰效应已成为Ka波段宽带卫星链路的标准做法。现在正在提出在Q/V频带（33 - 75 GHz）中操作这种系统的建议，该频带经历更宽范围的雨衰水平。由于衰落电平的变化率较高，ACM设计的一个主要方面是如何准确地设置裕度，以便在链路状态尚未完全已知时避免下一个操作点处的帧丢失。现有技术集中于使用预定的余量，但是当实际雨衰轮廓与假设的图案不同时，这种方法导致较差的性能。为了提高性能，我们建议使用在实际降雨事件期间动态得出的自适应裕度。仿真结果表明，与现有技术相比，在低误帧率（FER）的频谱效率的鲁棒性能。
The use of adaptive coding and modulation (ACM) to counter the effect of rain fades has become a standard approach in broadband satellite links operated in Ka-band. Now proposals are being made to operate such systems in Q/V band (33 - 75 GHz) which experience a wider range of rain fade levels. Due to the higher rate of change in fade levels, a major aspect of the ACM design is how to set margins accurately in order to avoid frame losses at the next operation point when the link state is not yet perfectly known. Existing techniques have focused on using predetermined margins but this approach results in poor performance when the actual rain fade profile is different from the pattern assumed. In order to improve performance, we propose the use of adaptive margins derived dynamically during the actual rain event. Simulation results show a robust performance in spectral efficiency at a low frame error rate (FER) in comparison with the existing techniques.