OFDM Based Bidirectional Multi-Relay SWIPT Strategy for 6G IoT Networks

• 作者: Weidang Lu Peiyuan Si Xin Liu Bo Li Zilong Liu Nan Zhao Yuan Wu
• 来源期刊: 中国通信（英文版）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: Guest Editorial
• 页码范围: 80-91
• 页数: 12页
• 语种: 英文

摘要

6G IoT networks aim for providing significantly higher data rates and extremely lower latency. However, due to the increasing-ly scarce spectrum bands and ever-growing massive number IoT devices (IoDs) deployed,6G IoT networks face two critical challenges,i.e., energy limitation and severe signal at-tenuation. Simultaneous wireless information and power transfer (SWIPT) and cooperative relaying provide effective ways to address these two challenges. In this paper, we inves-tigate the energy self-sustainability (ESS) of 6G IoT network and propose an OFDM based bidirectional multi-relay SWIPT strategy for 6G IoT networks. In the proposed strategy,the transmission process is equally divided into two phases. Specifically, in phase 1 two source nodes transmit their signals to relay nodes which will then use different subcarrier sets to decode information and harvest energy,respectively. In phase2 relay nodes forward signals to corresponding destination nodes with the harvested energy. We maximize the weighted sum transmission rate by optimizing subcarriers and power allocation. Our pro-posed strategy achieves larger weighted sum transmission rate comparing with the bench-mark scheme.