In this article, we investigate the performance of a piece-wise linear model of energy harvesting-based multiuser overlay spectrum sharing system. Herein, an energy-constrained secondary node acts as a cooperative relay to assist the information transmission between a primary transmitter and multiple primary receivers. In return for the cooperation, the secondary node enjoys access to the primary user’s spectrum for its own information transfer. Specifically, by employing a time-switching based receiver, the secondary node harvests energy from the received radio-frequency signal of primary transmitter during a dedicated energy harvesting phase. In the subsequent information transfer phase, the secondary node splits the harvested power to forward the primary data as well as its own information intended for another secondary user. We analyze the impact of decoding primary’s information at the secondary receiver on the performance of secondary network. Importantly, we propose an improved energy harvesting-based relaying scheme which makes an efficient use of available degrees of freedom and thereby enhances the performance of both primary and secondary networks significantly. For this analytical framework, we derive the expressions of outage probability for primary and secondary networks. Numerical and simulation results are obtained to extract various useful insights and to validate our theoretical developments.

中文翻译：

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基于能量收集的多用户重叠频谱共享网络的分段线性模型的性能分析

在本文中，我们研究了基于能量收集的多用户覆盖频谱共享系统的分段线性模型的性能。在此，能量受限的次级节点充当协作中继器，以辅助初级发射机和多个初级接收机之间的信息传输。作为合作的回报，次节点享受对主要用户频谱的访问以进行自身的信息传输。具体地，通过采用基于时间切换的接收器，在专用能量收集阶段期间，辅助节点从接收的主要发送器的射频信号中收集能量。在随后的信息传输阶段，辅助节点分配所收集的功率以转发主要数据以及其自身的信息，该信息将用于其他辅助用户。我们分析了在辅助接收器处解码主要信息对辅助网络性能的影响。重要的是，我们提出了一种改进的基于能量收集的中继方案，该方案有效利用了可用的自由度，从而显着提高了主网络和辅助网络的性能。对于此分析框架，我们导出了主网络和次网络的中断概率的表达式。获得了数值和仿真结果，以提取各种有用的见解并验证我们的理论发展。我们提出了一种改进的基于能量收集的中继方案，该方案可以有效利用可用的自由度，从而显着提高主网络和辅助网络的性能。对于此分析框架，我们导出了主网络和次网络的中断概率的表达式。获得了数值和仿真结果，以提取各种有用的见解并验证我们的理论发展。我们提出了一种改进的基于能量收集的中继方案，该方案可以有效利用可用的自由度，从而显着提高主网络和辅助网络的性能。对于此分析框架，我们导出了主网络和次网络的中断概率的表达式。获得了数值和仿真结果，以提取各种有用的见解并验证我们的理论发展。