In order to deploy short-range wireless communication devices in the primary transformer substation, a Maximum Inner Product(MIP) Method is proposed to extract the path-loss parameters in 110 kV and 220 kV primary tra...In order to deploy short-range wireless communication devices in the primary transformer substation, a Maximum Inner Product(MIP) Method is proposed to extract the path-loss parameters in 110 kV and 220 kV primary transformer substations. The maximum inner product of the testing data is calculated to find out the loss index n and the standard deviation σ, and then the pathloss models can be set up. By comparing the MIP with Minimum Mean Square estimation(MMSE) and Cumulative Sum(CUSUM), MIP can match the measured values best. In order to apply the MIP path-loss model, under the initial signal to noise ratio(SNR) at 5 dB and 10 dB, a ZigBee simulation system is constructed to validate the situation that bit error rate(BER) varies with distance. And the ZigBee devices with 5 units are tested in a 220 kV primary transformer substation. The result of the test proves that the path-loss model is accurate.展开更多
太赫兹(Terahertz,THz)通信在6G网络中展现了潜在的重要性,具有高传输速率、强抗干扰能力和易于信号检测等优点。回顾了已有的THz信道建模工作,分析了关键参数如分子吸收效应和传播距离的早期模型,以及基于纳米网络小粒子散射效应的时...太赫兹(Terahertz,THz)通信在6G网络中展现了潜在的重要性,具有高传输速率、强抗干扰能力和易于信号检测等优点。回顾了已有的THz信道建模工作,分析了关键参数如分子吸收效应和传播距离的早期模型,以及基于纳米网络小粒子散射效应的时域和频域信道模型。强调了THz通信技术面临的挑战,如功率放大器效率和多普勒扩展效应,这些限制了THz的传输距离和性能。鉴于这些挑战,提出了对波形设计的新要求,对增强正交时频空(Orthogonal Time Frequency Space,OTFS)波形进行了设计和研究,以减少高速移动带来的多普勒效应,搭建物理层仿真链路模型测量改进OTFS的性能。通过仿真和性能比较,展示了所提增强OTFS波形相对于传统波形的优越性。展开更多
基金the scientific project supported by the National Natural Science Foundation of China (No. 61571063)supported by the Beijing Municipal Natural Science Foundation (No. 3182028)
文摘In order to deploy short-range wireless communication devices in the primary transformer substation, a Maximum Inner Product(MIP) Method is proposed to extract the path-loss parameters in 110 kV and 220 kV primary transformer substations. The maximum inner product of the testing data is calculated to find out the loss index n and the standard deviation σ, and then the pathloss models can be set up. By comparing the MIP with Minimum Mean Square estimation(MMSE) and Cumulative Sum(CUSUM), MIP can match the measured values best. In order to apply the MIP path-loss model, under the initial signal to noise ratio(SNR) at 5 dB and 10 dB, a ZigBee simulation system is constructed to validate the situation that bit error rate(BER) varies with distance. And the ZigBee devices with 5 units are tested in a 220 kV primary transformer substation. The result of the test proves that the path-loss model is accurate.
文摘为了探索高频段室内无线体域网通信的可行性,对11 GHz室内无线体域网的传播特性进行了测量与研究。基于大量的测量数据,给出了11 GHz频段室内无线体域网的路径损耗、阴影效应与均方根时延扩展的统计特性。针对体对体通信时人体相对角度变化的场景,提出了一种具有相对角度影响的路径损耗模型,该模型利用了与身体角度相关的路径损耗指数、浮动截距以及身体角度因子修正相对角度变化引入的路径损耗。为了验证模型的适用性,对比分析了在小型空教室和大型会议室两种不同场景下相对角度变化对信道传播特性的影响。研究结果表明:在收发端距离固定的情况下,路径损耗指数、浮动截距和由相对角度引起的路径损耗(Path Loss caused by Relative Angle,PLRA)均与相对角度具有三角函数关系;在收发端相对角度固定时,PLRA与收发端距离无关,仅与相对角度有关。上述研究结果可以为11 GHz频段在未来室内无线体域网的使用提供理论基础与实践依据。
文摘太赫兹(Terahertz,THz)通信在6G网络中展现了潜在的重要性,具有高传输速率、强抗干扰能力和易于信号检测等优点。回顾了已有的THz信道建模工作,分析了关键参数如分子吸收效应和传播距离的早期模型,以及基于纳米网络小粒子散射效应的时域和频域信道模型。强调了THz通信技术面临的挑战,如功率放大器效率和多普勒扩展效应,这些限制了THz的传输距离和性能。鉴于这些挑战,提出了对波形设计的新要求,对增强正交时频空(Orthogonal Time Frequency Space,OTFS)波形进行了设计和研究,以减少高速移动带来的多普勒效应,搭建物理层仿真链路模型测量改进OTFS的性能。通过仿真和性能比较,展示了所提增强OTFS波形相对于传统波形的优越性。
