Research Of High Frequency And Wideband Channel Propagation Characteristics And Modeling

In order to cope with the future challenge of mobile data traffic explosive growth, massive device access, the continuous emergence of various new services and applications, the fifth generation mobile communication system (5G) will emerge as the times require. However, as the depletion of frequency resource below6GHz, the utilization of high frequency and wideband communication technology attracts more attention.Channel measurement and modeling for wireless communication system is the foundation of system design, transmission technology research&assessment and equipment performance testing. Therefore, based on radio wave propagation theory, faced with the requirements of future5G, this article dedicates to the investigation and research of the high frequency and wideband propagation characteristics and channel modeling. Some solid achievements have been obtained in this thesis and the main work includes the following two aspects:(1) The wireless channel measurement platform with a high center frequency of28GHz and a wideband of1GHz is built. Firstly, this thesis analyzes and summarizes the existing mainstream measurement platform. There is no commercial sounders working at high frequency band so far. The existing research is mostly based on separate electronic instruments and modules. Among these platforms, three typical solutions from NI, Agilent and WASIMO are introduced. Secondly, we introduce the frequency-domain measurement platform. It measures the channel propagation characteristic in frequency-domain It core module is vector network analyzer. We detail our platform which works in the frequency measurement in this research. It have a high center frequency of28GHz and a wideband of1GHz. It is composed of a VNA, power amplifier, low noise amplifier and horn antennas. The maximum measurable distance is30m, which is enough for indoor measurements.(2) The propagation characteristics of indoor scenarios are analyzed and modeled. Firstly, we introduce5important parameters (PDP, PAP, Path loss, RMS delay spread and Penetration loss) including definition and analysis method based on above platform. Secondly, we detail the specific measurement campaign. We set8TXs and105RXs in total. Thirdly, we analyze and modeled the5parameters. The result shows the propagation characteristics have strong relationships with the physical environment. PLEs are2.2,1.8and1.2for Hall, Office and Corridor scenarios respectively, excess loss ranged from5-10dB. The RMS delay spread is about50ns and increased with the size of scenario. Though LOS path play the dominant role, abundant MPCs were generated during propagation Penetration loss is3dB for glass. At last, we give the large-scale fading model and introduce an initial channel modelling method of High frequency and wideband channel.So we can use the precious measurement data and valuable conclusions in indoor scenarios under28GHz for design, simulation and evaluation of5G mobile communication systems to reflect the realistic propagation environment better. This work is a preliminary research on high frequency band channel measurement and modeling. Advanced study will proceed with the building of platform in time-domain.