Khalid Waqas, Yu Heejung, Ali Rashid, Ullah Rehmat
Institute of Industrial Technology, Korea University, Sejong 30019, Korea.
Department of Electronics and Information Engineering, Korea University, Sejong 30019, Korea.
Sensors (Basel). 2021 May 4;21(9):3197. doi: 10.3390/s21093197.
Fifth-generation (5G) networks will not satisfy the requirements of the latency, bandwidth, and traffic density in 2030 and beyond, and next-generation wireless communication networks with revolutionary enabling technologies will be required. Beyond 5G (B5G)/sixth-generation (6G) networks will achieve superior performance by providing advanced functions such as ultralow latency, ultrahigh reliability, global coverage, massive connectivity, and better intelligence and security levels. Important aspects of B5G/6G networks require the modification and exploitation of promising physical-layer technologies. This Special Issue (SI) presents research efforts to identify and discuss the novel techniques, technical challenges, and promising solution methods of physical-layer technologies with a vision of potential involvement in the B5G/6G era. In particular, this SI presents innovations and concepts, including nonorthogonal multiple access, massive multiple-input multiple-output (MIMO), energy harvesting, hybrid satellite terrestrial relays, Internet of Things-based home automation, millimeter-wave bands, device-to-device communication, and artificial-intelligence or machine-learning techniques. Further, this SI covers the proposed solutions, including MIMO antenna design, modulation detection, interference management, hybrid precoding, and statistical beamforming along with their performance improvements in terms of performance metrics, including bit error rate, outage probability, ergodic sum rate, spectrum efficiency, and energy efficiency.
第五代（5G）网络将无法满足2030年及以后对延迟、带宽和流量密度的要求，因此将需要具备革命性使能技术的下一代无线通信网络。超5G（B5G）/第六代（6G）网络将通过提供诸如超低延迟、超高可靠性、全球覆盖、大规模连接以及更高的智能和安全级别等先进功能来实现卓越性能。B5G/6G网络的重要方面需要对有前景的物理层技术进行改进和利用。本期专题（SI）展示了相关研究成果，旨在识别和讨论物理层技术的新颖技术、技术挑战以及有前景的解决方法，以期参与到B5G/6G时代。特别是，本期专题展示了创新和概念，包括非正交多址接入、大规模多输入多输出（MIMO）、能量收集、混合卫星地面中继、基于物联网的家庭自动化、毫米波频段、设备到设备通信以及人工智能或机器学习技术。此外，本期专题涵盖了所提出的解决方案，包括MIMO天线设计、调制检测、干扰管理、混合预编码和统计波束成形，以及它们在误码率、中断概率、遍历和速率、频谱效率和能量效率等性能指标方面的性能提升。
