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首页> 外文会议>IEEE Military Communications Conference >An Uplink Power Control driven compensation of wideband, semi-static, rain or interference induced link impairments affecting satellite feeder links operating at Ka band and above
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An Uplink Power Control driven compensation of wideband, semi-static, rain or interference induced link impairments affecting satellite feeder links operating at Ka band and above

机译：上行功率控制驱动的宽带，半静态，降雨或干扰引起的链路损伤补偿，影响在Ka频段及以上频段工作的卫星馈线链路

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High frequency bands (Ka band and above) are increasingly in vogue for feeder link connectivity between GEO satellites and their respective, possibly non-collocated, Gateways (GWs). At these frequencies, the return links of the VSATs (Very Small Aperture Terminals) experience a time and frequency dependent impairment due to rain events affecting the geographically diverse feeder links. In addition, as described in this paper, a frequency-dependent interference phenomenon is typically present on the feeder links of Ka band satellite systems. This paper describes a novel network-level and GW-centric signal processing algorithm for real-time estimation of the optimal uplink transmit power required at different VSATs in presence of feeder link impairments that exhibit these characteristics. In this algorithm, different VSATs report their individual estimates of the optimal uplink transmit power levels to the satellite GW. An adjacency-graph based linear algebraic method is employed at the GW for deriving the global estimate of the feeder link frequency-dependent transmit power levels based on the individual (or local) reports sent by each VSAT. A novelty of this estimation procedure is that it separates the impairments affecting the feeder from those on the mobile links from the end-to-end measurements. Finally, a scheme for compensation of the estimated variation in the link impairment levels is described. In this scheme, the nominal operating point of the Uplink Power Control (ULPC) process operating at each VSAT is periodically updated based on the estimate of the optimal uplink transmit power level. Resultant scheme for rain fade and interference mitigation provides an increase in the network-level spectral efficiency as well as a more robust operation of individual VSAT links with a reduced number of NACKs (Negative Acknowledgments).
机译：高频段（Ka频段及以上）正在日益流行，以促进GEO卫星与其各自（可能是非并置的）网关（GW）之间的馈线链路连接。在这些频率下，由于降雨事件影响了地理上不同的馈线链路，VSAT（甚小孔径终端）的返回链路会受到时间和频率的影响。此外，如本文所述，Ka波段卫星系统的馈线链路上通常会出现频率相关的干扰现象。本文介绍了一种新颖的网络级和以GW为中心的信号处理算法，用于在存在这些特性的馈线链路受损的情况下，实时估算不同VSAT所需的最佳上行链路发射功率。在该算法中，不同的VSAT将其各自的最佳上行链路发射功率电平估计值报告给卫星GW。在GW处采用基于邻接图的线性代数方法，以基于每个VSAT发送的单个（或本地）报告，得出与馈线链路频率相关的发射功率电平的全局估计。这种估算程序的新颖之处在于，它可以从端到端的测量中分离出影响馈线的损伤和移动链路上的损伤。最后，描述了用于补偿链路损伤水平的估计变化的方案。在此方案中，基于最佳上行链路发射功率电平的估计值，定期更新在每个VSAT上运行的上行链路功率控制（ULPC）过程的标称工作点。用于雨衰和减轻干扰的结果方案提供了网络级频谱效率的提高，以及单个VSAT链路的更健壮的操作，同时减少了NACK（否定确认）的数量。

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