SWIPT Cooperative Spectrum Sharing for 6G-Enabled Cognitive IoT Network
SWIPT Cooperative Spectrum Sharing for 6G-Enabled Cognitive IoT Network
复制标题
SWIPT 针对支持 6G 的认知物联网网络的合作频谱共享
DOI：
10.1109/jiot.2020.3026730
复制
发表时间：
2021-10-15
影响因子：
10.6
通讯作者：
Gong, Yi
中科院分区：
文献类型：
--
作者：
Lu, Weidang;Si, Peiyuan;Gong, Yi
物联网（IoT）能够提供各种物理对象以通过6G无线通信网络交换它们的信息。然而，随着IoT设备（IoD）数量的大量增加，IoD的部署面临两个基本挑战，即，频谱稀缺和能量限制。协同频谱共享和同步无线信息功率传输（SWIPT）为提高频谱利用率和能量利用率提供了有效途径。本文提出了两种SWIPT协作频谱共享方法来提高6G认知物联网网络的能量和频谱效率，其中IoD通过从接收到的射频（RF）信号中收集能量来作为正交频分复用（OFDM）中继访问主频谱。具体地，在阶段1中，认知IoT网络中的IoDs发射器（DT）利用接收到的RF信号执行信息解码和能量收集。在阶段2中，DT利用具有所收获的能量的正交子载波将主系统的信号和其自身的信号发送到对应的接收机以避免干扰。通过功率和子载波联合优化，在保证主系统目标速率的前提下，最大化放大转发（AF）和解码转发（DF）中继模式下认知物联网系统的可扩展速率。仿真结果表明，该方法在频谱和能量效率上都有明显的改善。
Internet of Things (IoT) is able to provide various physical objects to exchange their information through the 6G wireless communication network. However, with the large increasing number of the IoT devices (IoDs), the deployment of IoDs faces two basic challenges, i.e., spectrum scarcity and energy limitation. Cooperative spectrum sharing and simultaneous wireless information and power transfer (SWIPT) provide effective ways to improve the spectrum and energy efficiency. In this article, two SWIPT cooperative spectrum sharing methods are proposed to improve the energy and spectrum efficiency for 6G-enabled cognitive IoT network, in which IoDs access to the primary spectrum by serving as orthogonal frequency-division multiplexing (OFDM) relay with the energy harvested from the received radio-frequency (RF) signal. Specifically, in phase1, the IoDs transmitter (DT) in the cognitive IoT network performs information decoding and energy harvesting with the received RF signal. In phase2, DT transmits the signals of the primary system and itself to the corresponding receiver by utilizing orthogonal subcarriers with the harvested energy to avoid the interference. Achievable rates of the cognitive IoT system with amplify-and-forward (AF) and decode-and-forward (DF) relaying mode are maximized through joint power and subcarrier optimization, while ensuring the target rate of the primary system. Simulation results are performed to illustrate the improvement of the spectrum and energy efficiency.