Currently, 5G has become a buzzword in life, and more and more people are already using 5G cell phones and 5G networks to feel its super-fast internet speed. But 5G is still in the early stages of development, and there are still a lot of technologies and devices that have not been applied to real life,qcm6490 including millimeter waves.
Millimeter wave is an electromagnetic wave with a wavelength of 1-10 millimeters, which is located in the overlapping wavelength range of microwave and far-infrared, currently 24.75-27.5 ghz, and 37-42.5 ghz is China's leading millimeter wave band. In communication, it has many advantages, such as extremely wide bandwidth, narrow beam, good security, high transmission quality, etc., so there are also rumors that "does not support the millimeter wave is not actually 5G", here on the millimeter wave to make a detailed introduction.
Advantages and disadvantages of millimeter wave
As mentioned above, the biggest advantage of millimeter wave is wider bandwidth. According to Shannon's formula, the larger the bandwidth, the larger the channel capacity, the faster the communication rate, which means the faster the Internet speed we can use. The current sub-6GHz band has more devices that are susceptible to interference, while the millimeter wave band is relatively clean. In addition,what is a distinguishing feature of 5g mmwave millimeter wave can also be applied to the Internet of cars, remote control, automatic driving and other technologies require sufficient bandwidth and speed to achieve, these need millimeter wave to join, and even millimeter wave can achieve centimeter-level positioning accuracy.
Although millimeter wave is so powerful, but because of its two defects, so far it has not been widely spread, there is no good solution. One, they can't go very far due to the loss of very high frequency propagation. This would require building more 5G base stations and increasing their density, but the cost is too high. Another reason is that it is too intolerant of bad weather, such as rain or snow, and too susceptible to interference, leading to signal attenuation that is hundreds of times that of signals even below 6GHz.
The current state of millimeter wave
As far as companies are concerned, only the United States has fully commercialized millimeter wave systems. Because China's radio spectrum information resources are limited, and the U.S. military technology has a very economically developed, so it occupies a large number of sub-6GHz band, resulting in fewer commercial frequency bands. And when the 5G commercial technology continues to develop more mature, sub-6GHz signaling band is not enough, so they can only market millimeter wave technology themselves.
In China and other countries, sub-6GHz frequencies are used in the early stages of 5G because it is not heavily utilized, which can greatly reduce costs. Currently, other than Qualcomm processors, Kirin, MediaTek and others do not support millimeter waves.
Future trends in millimeter waves
Millimeter wave is undoubtedly the future trend of 5G, and its ultra-wide bandwidth brings advantages that cannot be reached by other frequency bands, so it must be the next stage of 5G development.
Although millimeter wave is coming trend, but can rely on their current technology companies are difficult to really do large-scale popularization, even Apple launched millimeter wave 5G cell phone this year, un will also reduce the students a certain amount of shipments. And the popularization of base stations and industrial chain education is as an important process, so the 5G development issue is still in progress, and millimeter wave will certainly be the next goal of the efforts of various manufacturers. So that sentence "does not support millimeter wave is not true 5G" is also us because of the competition in our commercial market, for the country's current society, research in the country does not have much practical significance in life.