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首页> 外文期刊>IEEE transactions on mobile computing >Energy Efficiency of Secure Cognitive Radio Networks with Cooperative Spectrum Sharing
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Energy Efficiency of Secure Cognitive Radio Networks with Cooperative Spectrum Sharing

机译：协作频谱共享的安全认知无线电网络的能效

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Energy-efficient and secure wireless communications have recently earned tremendous interests due to economic, environmental, and military concerns. This paper investigates the tradeoff between the secrecy throughput and the energy efficiency in cognitive radio networks (CRNs), where primary and secondary users with different priorities of spectrum access can either interfere or cooperate with each other. To gain an understanding of the intricate effects that system parameters have on underlay network's performance, we exclusively focus on characterizing several key aspects that may have potential impacts on secure underlay CRNs, including the transmission power, the number of interfering users, and the designed interference resistance coefficient. Based on the obtained analytical results, we further propose a cooperative spectrum sharing paradigm to improve both the secrecy throughput and the energy efficiency of primary users. The main idea is that primary users allow secondary users to simultaneously access the licensed spectrum and in return, the secondary transmitter acts as both a relay for primary transmissions and a friendly jammer against eavesdropping, in case the primary transmission fails. Both theoretical and numerical results reveal that: (i) When the interference from secondary transmitters is small, there is an optimal transmission power that maximizes the secrecy throughput for primary users compared to CRNs without the security issue. (ii) When the interference from secondary transmitters is large, the secrecy throughput increases with the transmission power for primary users. (iii) The transmission power that maximizes the energy efficiency is smaller than that maximizes the secrecy throughput for primary users. (iv) The number of interfering users has a slight impact on the secrecy throughput and the energy efficiency of primary users due to the secondary power control. (v) The proposed cooperative paradigm is an efficient approach to boost both the secrecy throughput and the energy efficiency of primary users compared with the traditional non-cooperative spectrum sharing, and provides an alternative method to compensate for the interference caused by secondary users.
机译：由于经济，环境和军事方面的考虑，节能，安全的无线通信最近赢得了巨大的兴趣。本文研究了认知无线电网络（CRN）中的保密吞吐量和能效之间的折衷，认知无线电网络（CRN）中具有不同频谱访问优先级的主要和次要用户可以相互干扰或相互配合。为了了解系统参数对底层网络性能的复杂影响，我们仅专注于表征可能对安全底层CRN产生潜在影响的几个关键方面，包括传输功率，干扰用户数量和设计干扰阻力系数。基于获得的分析结果，我们进一步提出了一种协作频谱共享范例，以提高保密吞吐量和主要用户的能源效率。主要思想是主要用户允许次要用户同时访问许可的频谱，并且作为回报，在主要传输失败的情况下，次要发送器既充当主要传输的中继，又充当防止监听的友好干扰器。理论和数值结果均表明：（i）当来自次要发射机的干扰较小时，与不存在安全问题的CRN相比，存在一种最佳发射功率，该功率可以最大程度地提高主要用户的保密吞吐量。 （ii）当次要发射机的干扰很大时，保密吞吐量随着主要用户的发射功率而增加。 （iii）使能源效率最大化的传输功率小于使主要用户的保密吞吐量最大化的传输功率。 （iv）由于辅助功率控制，干扰用户的数量对主要用户的保密吞吐量和能效有轻微影响。 （v）与传统的非合作频谱共享相比，拟议的合作范式是提高主要用户的保密吞吐量和能效的有效方法，并提供了替代方法来补偿次要用户造成的干扰。

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