Energy-efficient framework for throughput enhancement of cognitive radio network,International Journal of Communication Systems

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Energy-efficient framework for throughput enhancement of cognitive radio network
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2021-07-06 , DOI: 10.1002/dac.4918
Indu Bala ₁ , Kiran Ahuja ₂

Affiliation

Recently, cognitive radio (CR) has evolved as a next-generation communication technology that has the potential to use the radio frequency (RF) spectrum in most efficient manner as compared to the other existing cellular communication technologies. The performance of CR system largely depends upon the accuracy of the sensing results. However, the sensing ambiguities such as false alarm and miss detection cause spectrum underutilization and severe interference to the primary user (PU), respectively. In this paper, both issues are addressed by modifying the conventional frame structure by introducing two sensing slots along with a transmission slot to overcome sensing ambiguities. For the targeted probability of detection, the first sensing slot is kept small and fixed, and sensing results are stored in a flag bit up to that duration. The second sensing slot (optional) is used whenever the flag bit status varies in the current frame from the previous frame. Considering sensing throughput trade-off issue of CR, the second sensing slot is optimized to enhance the effective throughput and energy efficiency of the secondary communication system. The simulation results are presented to validate the effectiveness of the proposed scheme with a modified frame structure, which is capable to achieve 65% higher energy efficiency than the conventional scheme when PU is present in a channel, that is, P(H₁) = 1.

中文翻译：

用于认知无线电网络吞吐量增强的节能框架

最近，认知无线电 (CR) 已发展成为下一代通信技术，与其他现有蜂窝通信技术相比，它有可能以最有效的方式使用射频 (RF) 频谱。CR 系统的性能很大程度上取决于传感结果的准确性。然而，误报和漏检等感知模糊分别导致频谱未充分利用和对主用户（PU）的严重干扰。在本文中，通过引入两个传感时隙和一个传输时隙来修改传统的帧结构来克服传感歧义，从而解决了这两个问题。对于目标检测概率，第一个感测时隙保持较小且固定，感测结果存储在标志位中直至该持续时间。每当当前帧中的标志位状态与前一帧不同时，就会使用第二个感测时隙（可选）。考虑到CR的感知吞吐量权衡问题，优化了第二个感知时隙，以提高二次通信系统的有效吞吐量和能量效率。仿真结果验证了所提出的具有改进帧结构的方案的有效性，当信道中存在 PU 时，该方案能够实现比传统方案高 65% 的能量效率，即，优化第二感测时隙以提高二次通信系统的有效吞吐量和能量效率。仿真结果验证了所提出的具有改进帧结构的方案的有效性，当信道中存在 PU 时，该方案能够实现比传统方案高 65% 的能量效率，即，优化第二感测时隙以提高二次通信系统的有效吞吐量和能量效率。仿真结果验证了所提出的具有改进帧结构的方案的有效性，当信道中存在 PU 时，该方案能够实现比传统方案高 65% 的能量效率，即，P ( H ₁ ) = 1。

更新日期：2021-08-04

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