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Multi-Gateway Data Predistortion for Non-Linear Satellite Channels

机译：非线性卫星信道的多网关数据预失真

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摘要

Joint on-board amplification of multiple carriers reduces hardware and weight, enabling cost-efficient satellite architectures. However, on-board power amplification is inherently a non-linear operation and the distortion effects drastically increase when the high-power amplifier (HPA) is operated in multiple-carrier mode due to the generated inter-modulation products. In order to achieve the desired on-board power efficiency and to reduce the non-linear distortion, specific countermeasures need to be put in place. Emerging multi-gateway satellite systems where, in the most general case, each carrier is uplinked independently from a different gateway, would gain further flexibility by adopting a multicarrier architecture. While advanced predistortion techniques are already available for the single-gateway scenario, no solution has been proposed for the multi-gateway multicarrier scenario. In this work, we propose novel distributed predistortion techniques to improve spectral and power efficiency in multi-gateway non-linear satellite channels. Further, we analyze the multiple-carrier predistortion parameter estimation error with respect to noise sensitivity, proposing a robust version of the indirect learning method. Distributed processing becomes sensitive to synchronization amongst the actors, and we present an evaluation of the sensitivity of proposed techniques to imperfections.
机译：多个载波的联合机载放大可减少硬件和重量，从而实现具有成本效益的卫星架构。但是，由于高功率放大器（HPA）在多载波模式下工作，由于产生的互调产物，因此车载功率放大本质上是非线性操作，并且失真效应会急剧增加。为了获得所需的车载电源效率并减少非线性失真，需要采取特定的对策。在最一般的情况下，新兴的多网关卫星系统在每个载波独立于不同网关上行链路的情况下，将通过采用多载波体系结构来获得更大的灵活性。尽管高级预失真技术已可用于单网关方案，但尚未提出针对多网关多载波方案的解决方案。在这项工作中，我们提出了新颖的分布式预失真技术，以提高多网关非线性卫星信道中的频谱和功率效率。此外，我们针对噪声敏感度分析了多载波预失真参数估计误差，提出了一种间接学习方法的可靠版本。分布式处理变得对参与者之间的同步变得敏感，我们对提出的技术对缺陷的敏感性进行了评估。

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