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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Review of Hybrid Beamforming Technology for Millimeter Wave Massive MIMO System LIU Jian, QIAN Yingjing, ZHANG Renmin Journal of Jishou University(Natural Sciences Edition)    2022, 43 (1): 43-52.   DOI: 10.13438/j.cnki.jdzk.2022.01.008 Abstract （863）      PDF（pc） （705KB）（460）       Knowledge map    Save In view of hybrid beamforming techniques for mmWave communications,we first describe the transmission characteristics of the mmWave  and its channel model,and outline the architecture of a massive mmWave MIMO hybrid beamforming system and its mathematical model.On that basis,we summarize  the transmission scheme and introduce two feasible methods of mmWave beam alignment.Finally,the typical applications  of mmWave communication integrated with other technologies and the future research hotspots  are anticipated. Reference | Related Articles | Metrics | Comments（0） Select Design of High Precision DMCS Drilling Machine ZHANG Xing, CHEN Hanhan, XU Weixiong, CAO Jin, WU Liming Journal of Jishou University(Natural Sciences Edition)    2021, 42 (2): 50-55.   DOI: 10.13438/j.cnki.jdzk.2021.02.009 Abstract （605）      PDF（pc） （1932KB）（141）       Knowledge map    Save In order to achieve accurate positioning of drilling and milling, the movement of drill bit is monitored and corrected in real time with the help of frequency converter, servo driver and the use of grating ruler. At the same time, the continuous trajectory interpolation movement can be realized through the DMCS control system, so as to drill and remove chips for large area of materials. That can realize the automatic drilling and tapping of a large number of small holes in soft materials. Reference | Related Articles | Metrics | Comments（0） Select Design of Multifunctional Desk Lamp Control System Based on Bluetooth TAO Zengjie, YUAN Keke, LI Shiyou, FU Dingyuan Journal of Jishou University(Natural Sciences Edition)    2021, 42 (2): 56-60.   DOI: 10.13438/j.cnki.jdzk.2021.02.010 Abstract （925）      PDF（pc） （1803KB）（435）       Knowledge map    Save A multifunctional desk lamp control system based on bluetooth is designed. First, the light sensor detects the intensity of light. The infrared sensor detects the person. The ultrasonic sensor detects the distance between the person and the lamp. These signals are transmitted to the microcontroller unit which compares the detected signals with the set values. It analyzes the signals to determine whether the light is on or off, adjusts the brightness and gives an alarm. At the same time, the corresponding parameters are displayed on the OLED and the bluetooth terminal. The terminal can also control the desk lamp. Through on-line testing with bluetooth, the system is powerful  and stable. Reference | Related Articles | Metrics | Comments（0）