Space missions exploiting small satellite networks with a use of software-defined radio (SDR) and advanced random access (RA) protocols have attracted an increased amount of attentions given their low costs, low latency levels, low complexity, and yet competitive data rates for global network services. In this article, we derive a mathematical model to demonstrate the reliability of a small satellite network with respect to SDR structures, the transmitted signal power on the uplink/downlink channels, code rates, and packet collisions through an enhanced RA protocol. Our model provides quantitative network reliability with respect to SDR system failure rates, feasible communication parameters, and packet loss ratios. Our analysis suggests a methodology to evaluate network reliability differences according to changes of communication parameters, and a guideline to sustain a reliable network system with appropriate parameter values. We find out that a robust SDR structure with a state-of-the-art analog-to-digital converter can provide reliable network services effectively with reduced power consumption, even with high packet traffic loads, to meet operator-required reliability levels for small satellite networks.

中文翻译：

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具有软件定义无线电和增强型多址协议的小型卫星网络的可靠性


利用软件定义无线电 (SDR) 和高级随机访问 (RA) 协议开发小型卫星网络的太空任务因其低成本、低延迟水平、低复杂性以及具有竞争力的数据速率而吸引了越来越多的关注。全球网络服务。在本文中，我们推导了一个数学模型，通过增强的 RA 协议来证明小型卫星网络在 SDR 结构、上行链路/下行链路信道上的传输信号功率、码率和数据包冲突方面的可靠性。我们的模型提供了有关 SDR 系统故障率、可行通信参数和丢包率的定量网络可靠性。我们的分析提出了一种根据通信参数的变化评估网络可靠性差异的方法，以及以适当的参数值维持可靠网络系统的指南。我们发现，即使在高数据包流量负载的情况下，具有最先进的模数转换器的鲁棒SDR结构也可以有效地提供可靠的网络服务，同时降低功耗，从而满足运营商对小型网络的可靠性要求。卫星网络。