5G as the next generation of mobile communication network, if you use a key word to describe is "fast". Behind this "fast", you need powerful technology to support. So what are the black technologies you don't know?

Today to analyze the 5G black science and technology one of the "millimeter wave". 5G network is through the radio for communication, radio waves have such a characteristic, low-frequency radio waves with a narrow bandwidth of small amount of information, and high-frequency radio waves with a high bandwidth of large amount of information. 5G network through a high frequency radio waves to spread the information to achieve the "network speed". "Network speed" leap, because the wavelength of this wave is only millimeter,qcm6490 so it is named "millimeter wave".

So what are millimeter waves? Millimeter waves are electromagnetic waves with a wavelength between 1 and 10 millimeters, usually corresponding to the radio spectrum between 30 GHz and 300 GHz.

Millimeter waves have four characteristics:

The first point: the spectrum is wide, with the use of a variety of multiple access multiplexing technology we can get a great enhancement of channel capacity, suitable for high-speed multimedia information transmission data services;

The second point: high reliability, high frequency, so that it is subject to interference is small, can better withstand the impact of rainy days, to provide a stable transmission channel.

The third point: good directivity, millimeter wave is absorbed by various suspended particles in the air, making the transmission beam narrower, increasing the difficulty of eavesdropping, suitable for short-distance point-to-point communication;

The fourth point: the wavelength is very short, the required antenna size is very small, easy to integrate in a small space in a large size antenna array.

For a long period of history, millimeter wave has been in a state of neglect. On the one hand, there is no commercial demand, and on the other hand, it is because the related technology is underdeveloped and the cost of related equipment is too high. With the rapid development of mobile communications, the frequency resources within 30 GHz are almost exhausted. The government and the International Organization for Standardization (ISO) have allocated all the "good" frequencies, but there are still frequency shortages and frequency conflicts.

5G will come, spectrum information resource management is like a city center house are as stretched, millimeter wave is like a new continent, to the mobile Internet users and mobile operators development provides "endless" frequency for resources,what is a distinguishing feature of 5g mmwave it can be said that millimeter wave is definitely a new weapon of the 5G network.

Previously, the maximum bandwidth available for 4G was 100MHz, with a data transfer rate of no more than 1Gbps, while in the millimeter wave band, the maximum bandwidth available for mobile applications is 400MHz, with a data transfer rate of 10Gbps or higher, which feels good, right?

However, "millimeter wave" there is also such a very serious problem, they are very "straight", encounter obstacles will also head on, resulting in weak data signals. So: high-frequency signal "network speed" fast, but "through the wall" ability is weak, the signal to cover the whole country small; and low-frequency control signal "network speed" slow, "through the wall" ability is weak. The low-frequency control signal "network speed" is slow, "through the wall" ability is strong, the signal can cover a large global range. Millimeter wave" is through the high-frequency signal, to solve the "through the wall" ability to weak social problems we have to start to establish a very large number of base stations to ensure that the network covers the scope of work.