| With the rapid development of wireless communication,the frequency bands below6 GHz have been gradually divided and become extremely crowded.While the millimeter-wave frequency band,which has not been widely used,has a huge communication bandwidth and can support higher-speed data transmission.However,the millimeter-wave frequency band has very different channel propagation characteristics due to its high frequency.For many 5G millimeter-wave frequency bands in various application scenarios,channel measurement campaigns are required to comprehend the channel characteristics.This will strongly support channel modeling,wireless communication system design,network deployment planning,and device performance testing.Usually,to effectively collect or radiate signals of all spatial angles in the channel sounding,the methods of omnidirectional antenna,multi-directional antenna splicing,and one-directional antenna scanning are used.These methods have the disadvantages of small dynamic range,complicated calibration with high cost,and limited scanning speed,respectively.In addition,the large bandwidth of millimeter-wave brings difficulties such as high system synchronization and calibration accuracy requirements,fast data storage,and complex parameter analysis,which also brings challenges to the millimeter-wave channel sounding.In response to the above characteristics,this paper proposes a 5G millimeter-wave channel sounding method based on phased array antennas,and a millimeter-wave channel sounder is independently designed and built.This work and research results are of great significance to channel sounding and modeling in the millimeter-wave frequency band.The main work and achievements of this paper include:(1)Research the 5G millimeter-wave channel sounding method based on a phased array antenna.Based on the phased array antenna and the large bandwidth vector signal transceiver equipment,a channel sounding method and a channel parameter extraction method suitable for the phased array antenna is proposed,respectively.The influence of different sounding waveforms on system performance is emphatically expounded,then the channel sounding signal composed of the Zadoff-Chu sequence is selected by comparison.Secondly,by building a signal model,the research on channel impulse response synthesis and other channel parameter extraction methods is completed.(2)A complete millimeter-wave channel sounder design and verification process is proposed.Based on the system design scheme,the construction of the system is completed;the system verification process is given,which proves that the system can accurately measure millimeter-wave channels from many aspects.The above design scheme and verification process are of reference significance for the design,construction,and verification of the millimeter-wave channel sounder.(3)To further verify the availability of the channel sounding method and system proposed in this paper,a channel measurement campaign is carried out for typical 5G millimeter-wave scenarios(industrial Internet of Things scenarios).The channel parameters are extracted and analyzed for the measurement data,and the results are compared with the model released by the 3GPP.The measurement results show that the channel sounder in this paper can accurately measure 5G millimeter-wave channels,which also provides a reference for the research of millimeter-wave industrial Internet of Things. |
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