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arXiv 2301.12973eess.SPcs.ITmath.IT
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基于特征函数的VSAT到多星上行链路传输鲁棒预编码

Robust Precoding via Characteristic Functions for VSAT to Multi-Satellite Uplink Transmission

Maik Röper, Bho Matthiesen, Dirk Wübben, Petar Popovski, Armin Dekorsy

摘要:

研究了甚小口径终端(VSAT)向多颗卫星的上行链路。甚小口径终端可以配备多个天线,允许向多个卫星进行并行传输。提出了一种基于卫星不完全位置信息的低复杂度预编码算法。位置不确定性的概率分布和信道元素的统计通过位置不确定性的特征函数相关联。该知识被包括在预编码器设计中以最大化卫星处的平均信号与泄漏噪声比(SLNR)。此外,性能w.r.t.对卫星间距离进行数值估计。结果表明,该方法实现了完美的位置知识和足够大的星间距离的能力。在不完善的位置知识的情况下,鲁棒预编码器的性能下降相对较小。

英文摘要:

The uplink from a very small aperture terminal (VSAT) towards multiple satellites is considered, in this paper. VSATs can be equipped with multiple antennas, allowing parallel transmission to multiple satellites. A low-complexity precoder based on imperfect positional information of the satellites is presented. The probability distribution of the position uncertainty and the statistics of the channel elements are related by the characteristic function of the position uncertainty. This knowledge is included in the precoder design to maximize the mean signal-to-leakage-and-noise ratio (SLNR) at the satellites. Furthermore, the performance w.r.t. the inter-satellite distance is numerically evaluated. It is shown that the proposed approach achieves the capacity for perfect position knowledge and sufficiently large inter-satellite distances. In case of imperfect position knowledge, the performance degradation of the robust precoder is relatively small.

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