Appropriate candidate frequency bands are extremely important for the development of future 5G systems. In this work, the researches on 5G spectrum around the world are summarized. Then the potential candidate frequen...Appropriate candidate frequency bands are extremely important for the development of future 5G systems. In this work, the researches on 5G spectrum around the world are summarized. Then the potential candidate frequency bands for 5G systems are investigated based on practical utilization of spectrum in China. For spectrum below 6GHz, the feasibility of possible frequency bands for 5G system are analyzed, which mainly come from 2G/3G/4G spectrum re-farming, the spectrum identified by footnotes for IMT systems in Regulations on the Radio Frequency Allocation of China, and potential candidate bands from WRC-15 Agenda Item 1.1. Moreover, propagation characteristics of WRC-15 candidate frequency bands proposed by China are measured and modeled to verify their effectiveness. For spectrum above 6GHz, the potential candidate frequency bands for 5G systems are selected based on the preliminary analysis of spectrum allocation, allotment and the current usage in China. Suggestions are provided for further studies on 5G spectrum.展开更多
现代通信技术的一个重要特点是计算机技术与通信技术的紧密结合。随着计算机技术的迅速发展,对现代通信业也有更好的促进作用。借助计算机技术对通信技术的支持,对通信环境下的信道进行了测量与分析。传统移动蜂窝频段的严重短缺,使得...现代通信技术的一个重要特点是计算机技术与通信技术的紧密结合。随着计算机技术的迅速发展,对现代通信业也有更好的促进作用。借助计算机技术对通信技术的支持,对通信环境下的信道进行了测量与分析。传统移动蜂窝频段的严重短缺,使得高频段的开发与利用受到越来越多的关注与研究。采用基于PN序列的时域测量系统,在15 GHz频段下对室内走廊环境的直视场景进行了信道测量,分析了其大尺度特性,得到了距离和路径损耗的关系,并计算得出室内走廊环境下的路径损耗指数和阴影衰落。测量采用波束宽度为10°、增益为25 d Bi的标准增益喇叭天线,通过改变发射天线俯仰角和接收天线水平角得到某个距离下的测量数据,分析了特定场景下接收功率随角度的变化特性。展开更多
Abstract A compact frequency notched microstrip slot antenna for ultra-wideband （UWB）/2.4 GHz-band wireless local area network（WLAN） applications is proposed. The antenna is similar to a conventional microstrip sl...Abstract A compact frequency notched microstrip slot antenna for ultra-wideband （UWB）/2.4 GHz-band wireless local area network（WLAN） applications is proposed. The antenna is similar to a conventional microstrip slot antenna; however, by introducing a cross wide slot and a meandered-slotted stub, both compact size and frequency notched function can be achieved. It has been studied both numerically and experimentally for its impedance bandwidth, surface current distribution, radiation patterns, and gain. As will be seen, an operation bandwidth of over 4.6：1 ranging fi＇om 2.39 to 11.25 GHz for return loss lower than -10 dB having a frequency notched band ranging from 4.75 to 5.85 GHz has been achieved, and good radiation performance over the entire frequency range has also been achieved.展开更多
基金supported by the National Science and Technology Major Project under Grants No.2013ZX03003016 and No.2015ZX03002008National High-tech R&D Program(863 Program)under Grants No.2014AA01A706
文摘Appropriate candidate frequency bands are extremely important for the development of future 5G systems. In this work, the researches on 5G spectrum around the world are summarized. Then the potential candidate frequency bands for 5G systems are investigated based on practical utilization of spectrum in China. For spectrum below 6GHz, the feasibility of possible frequency bands for 5G system are analyzed, which mainly come from 2G/3G/4G spectrum re-farming, the spectrum identified by footnotes for IMT systems in Regulations on the Radio Frequency Allocation of China, and potential candidate bands from WRC-15 Agenda Item 1.1. Moreover, propagation characteristics of WRC-15 candidate frequency bands proposed by China are measured and modeled to verify their effectiveness. For spectrum above 6GHz, the potential candidate frequency bands for 5G systems are selected based on the preliminary analysis of spectrum allocation, allotment and the current usage in China. Suggestions are provided for further studies on 5G spectrum.
文摘现代通信技术的一个重要特点是计算机技术与通信技术的紧密结合。随着计算机技术的迅速发展,对现代通信业也有更好的促进作用。借助计算机技术对通信技术的支持,对通信环境下的信道进行了测量与分析。传统移动蜂窝频段的严重短缺,使得高频段的开发与利用受到越来越多的关注与研究。采用基于PN序列的时域测量系统,在15 GHz频段下对室内走廊环境的直视场景进行了信道测量,分析了其大尺度特性,得到了距离和路径损耗的关系,并计算得出室内走廊环境下的路径损耗指数和阴影衰落。测量采用波束宽度为10°、增益为25 d Bi的标准增益喇叭天线,通过改变发射天线俯仰角和接收天线水平角得到某个距离下的测量数据,分析了特定场景下接收功率随角度的变化特性。
基金the National Natural Science Foundation of China（60432040）.
文摘Abstract A compact frequency notched microstrip slot antenna for ultra-wideband （UWB）/2.4 GHz-band wireless local area network（WLAN） applications is proposed. The antenna is similar to a conventional microstrip slot antenna; however, by introducing a cross wide slot and a meandered-slotted stub, both compact size and frequency notched function can be achieved. It has been studied both numerically and experimentally for its impedance bandwidth, surface current distribution, radiation patterns, and gain. As will be seen, an operation bandwidth of over 4.6：1 ranging fi＇om 2.39 to 11.25 GHz for return loss lower than -10 dB having a frequency notched band ranging from 4.75 to 5.85 GHz has been achieved, and good radiation performance over the entire frequency range has also been achieved.
