This paper reports a relative performance analysis of decode-and-forward (DF) and amplify-and-forward (AF) relaying in a multi-antenna cooperative cognitive radio network (CCRN) that supports device-to-device (D2D) communications using spectrum sharing technique in cellular network. The system model considers cellular system as primary users (PUs) while Internet of Things Devices (IoDs), involved in D2D communications, as secondary system. The devices access the licensed spectrum by means of the cooperation in two-way primary communications. Furthermore, IoDs are energized through energy harvesting (EH) of PU radio frequency (RF) signals, using simultaneous wireless information and power transfer (SWIPT) protocol. Closed form expressions of the outage probability for both cellular and D2D communications are derived and the impact of various design parameters for both AF and DF relaying techniques are studied. Based on the simulation results, it is found that the proposed spectrum sharing protocol outperforms by 209% and 49% for DF relaying and AF relaying schemes, respectively. It is also observed that DF relaying performs better in term of peak energy efficiency (EE) at low transmit power while AF relaying at high transmit power.

中文翻译：

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SWIPT 中的中断分析支持协作 AF/DF 中继辅助双向频谱共享通信


本文报告了多天线协作认知无线电网络 (CCRN) 中解码转发 (DF) 和放大转发 (AF) 中继的相对性能分析，该网络支持设备到设备 (D2D) 通信，使用蜂窝网络中的频谱共享技术。该系统模型将蜂窝系统视为主要用户（PU），而参与D2D通信的物联网设备（IoD）视为次要系统。设备通过双向主通信的配合来接入许可频谱。此外，IoD 通过 PU 射频 (RF) 信号的能量收集 (EH) 并使用同步无线信息和电力传输 (SWIPT) 协议来供电。导出了蜂窝和 D2D 通信中断概率的封闭式表达式，并研究了各种设计参数对 AF 和 DF 中继技术的影响。基于仿真结果，发现所提出的频谱共享协议的性能分别优于 DF 中继和 AF 中继方案 209% 和 49%。还观察到，在低发射功率下，DF 中继在峰值能效 (EE) 方面表现更好，而 AF 中继在高发射功率下表现更好。