The computer hasn’t changed since 12 years. It started with the first version of the 15-inch Retina Macbook, and has always been accustomed to using its own keyboard to play the game code, even playing Call of Duty 4 and using the touchpad to operate. Haha. After working with a pen, I shuttled between the units and my home. I gradually became accustomed to using the monitor to work. At this time, I couldn't use my keyboard to use it. I wondered if I could use a keyboard and mouse. The initial combination was IKBC Poker 2+Apple Mouse. I bought a red shaft for Poker 2 and I feel pretty good. It's a pity that it's 61 keys. It's not very convenient to handle some CAD tasks because there is no arrow key, so I wondered. To change a keyboard, of course, because of the small hand, it will not consider full-size, the target is set at 87 keys. Also considered the second generation of FLICO's hand, but the price is moving, coincides with seeing the rice meter inside the rice keyboard, 299 yuan, white keyboard + aluminum, good value, although not using the Cherry axis, plus before experience Over Kay China-made shafts, then place orders. First of all, we must make it clear that this is the Yuemi keyboard, not the millet keyboard, Yuemi is an ecological chain company owned by Xiaomi. Simply put, it is the company that the Monkey King invests in. The packaging reminds me of Apple's style. The back is the product's parameters, the product model is MK01, should be the company's first keyboard. After opening the box, the accessories are very simple. In addition to the keyboard itself, Micro Usb cables and manuals are provided. It is not understood that there is no key puller. Should this be a standard mechanical keyboard? To know that the white keyboard is very easy to hide, you need to clean it up regularly. Like my obsessive compulsive disorder, wash your hands before going home everyday. The instruction manual mainly introduces the connection method and the operation method of light efficiency. Keyboard uses a PC + ABS resin two-color keyboard, the advantage is that the characters are not so easy to wear off; the panel is a mirror of milky white plastic, quite like Apple's previous G4 keyboard, but the biggest drawback of this material is a long time There will be a lot of subtle scratches. The back of the aluminum plate with a design, matte process, easy to leave fingerprints, the side almost 15mm thick; slightly lower position to do two silicone anti-slip mats, in fact, 940g of the keyboard on the table is not a good slide. The bracket of the keyboard is made of plastic, and the aluminum plate is so thick pressed on it that it is worried about the late loss of this accessory. Close-ups are made between the panel and the shell, and the gaps in some places are larger, but the overall fit is within the acceptable range. The interface between the keyboard and the computer uses the Micro Usb interface. When the later version is changed to Type C, it is more convenient. The original wire is said to use a pure copper core shielded wire, not the local tyrants did not dare to open, it is a bit too hard. When it comes to mechanical keyboards, I have to touch my hands. For example, several mechanical keyboards I've used before had the keyboards of Cherry's red-axis Poker 2 and domestic Kao Qing-yan's ass and so on. Individuals still prefer the red axis because the blue-axis. I couldn’t stand the sound of the noise (of course there are many people like it too), so seeing the red axis is one of the reasons why I purchased the Yuemi keyboard. Wyatt uses a domestic TTC shaft body, the shaft life is still a sense of hand protection, the actual experience down compared with Cherry's Poker 2 is not as big as imagined, of course, even if Cherry original shaft, different keyboard Your work will also affect the typing touch. For Yuemi keyboard, the feeling is a bit fleshy, but this gap is not easy to feel if it is not noticed in the codeword; the sense of triggering speed is not bad, and this evaluation is played by Yuemi. And the computer connection is also very simple, whether it is Win or Mac are plugged in, do not drive, but Mac use, the Command key will move one to the left, need the user to enter the settings to adjust, because I use two kinds of a day The brand's keyboard (home Yuemi, unit IKBC), I'm too lazy to change, anyway, not to get in the way. Yuemi keyboard is used on the back of the LED lights, the brightness is very full, the color temperature is 6500K white, unlike the kind of Marquee on Taobao so non-mainstream. Through the Fn + direction to operate the brightness of the light up and down, a total of 6 files brightness, like I usually open the office, is basically adjusted to 30% of the brightness is OK. Like the Caps Lock, Scroll Lock and other shortcut keys provide orange / white bi-color backlight, easy prompt case switch. advantage: Beauty of appearance Disadvantages: Less function Key meat Late panels are prone to scratches 299 yuan price of the mechanical keyboard there are many, Taobao can also buy the Cherry axis of the domestic keyboard, look at the value or look at the function, depending on your choice.
The Picture of 3G 4G LTE/5G Antenna
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It is widely regarded as high rate of 2 and good anti-multipath fading performance. In the future, RESEARCH related to OFDM technology will also be carried out in 5G communication networks. The main key technologies of 4G communication system include: a. OFDM technology; B. MIMO technology; C. Multi-user detection technology; D. Software radio; E. Smart antenna technology; F. IPv6 technology. China's Ministry of Industry and Information Technology has just issued 4G licenses to the three major operators, and they are still deploying their networks on a large scale with a small number of users. At this time, China Mobile said it will start the RESEARCH and development of 5G communication system. Analysts pointed out that the three major operators are participating in THE RESEARCH and development of 5G, one is to keep up with the changes of The Times, and the other is that the demand is faster than the technology development. Li Zhengmao, vice-president of China Mobile, said at the 2014 MWC in Barcelona: "China Mobile will fully support the development of 5G projects, hoping to lead the industry in THE development of 5G technology and the setting of technical standards." With the deepening of mobile communication technology research, the key support technologies of 5G will be gradually defined and enter the substantive standardization research and formulation stage in the next few years. The jury is still out on what core technologies will be used in the future. However, I have compiled a list of nine key technologies that have been the focus of discussion in various high-end mobile forums. A. Large-scale MIMO technology; B. Filter bank based multi-carrier technology; C. Full duplex technology; D. Ultra-dense heterogeneous network technology; E. Self-organizing network technology; F. Use of high frequency band; G. Software-defined wireless networks; H. Wireless access technology: (1) BDMA (Beam Split multiple Access technology)
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3 (2) NOMA (Non-orthogonal multiple Access technology) i. D2D (device-to-device) communication. Figure 1 is the layout of Massive MIMO antennas in 5G communication networks. I am studying Massive MIMO technology in my lab. Figure 1 shows users communicating with each other centered on a large-scale antenna. The performance of wireless communication systems is mainly restricted by mobile wireless channels. Wireless channel is very complex, and its modeling has always been a difficult point in system design. Generally, statistics are made according to the measured values of communication systems in specific frequency bands. Wireless fading channel is divided into large scale fading channel model and small scale fading channel model. The so-called large-scale fading model describes the field intensity variation over a long distance (hundreds or thousands of meters) between the transmitter and receiver, and reflects the rule that the received signal power changes with the distance caused by path loss and shadow effect. A small scale fading model describes the rapid fluctuations of the received field intensity over a short distance or time. The large scale fading channel model is caused by the influence of the surface contour (such as mountains, forests, buildings, etc.) between the receiver and the source. The small-scale fading channel model is caused by the multipath effect and doppler effect. If there are a large number of reflected paths but no LOS (direct signal) signal component, the small-scale fading is called Rayleigh fading, and the envelope of the received signal is described statistically by the Rayleigh probability density function. If LOS is present, the envelope is subject to Rician distribution. Multipath effect phenomena cause flat fading and frequency selective fading.
"Preface"