Lu Yao once said: "People would rather care about a lame film actor's eating and drinking Lhasa and the trivial, rather than knowing the ordinary world of the choppy inner world." These two days of media editors broke the heart of Lin Dan's derailment. One of Huawei’s news was supposed to be major news, and the limelight was completely robbed by Lin Dan.
At 0:45 am local time on November 17th, at the 3GPP RAN187 meeting, the 5G short code solution discussion, after hard work and fierce competition, Huawei's Polar Code program finally won. Become the final scheme of 5G control channel eMBB scene coding.
For the people who eat melons, Chinese characters are recognized, but only those who are unconscious. Here I want to play as much as possible of the waste heat of the postgraduate students of the North Post, and to restore the truth as much as possible.
One: low-key Huawei and exaggerated media
With such a big deal, Huawei has maintained a consistently low-key style. There is only one short piece of news on the official website.
The media has collectively climaxed:
Rolling Qualcomm, Huawei won the 5G short code program, the polarization code may make Wifi disappear;
The country is boiling! Huawei crushed Qualcomm, defeated Europe and the United States, and won the 5G era, China's first occupation of the highest point! ;
incredible! Huawei won the 5G short code solution, and the 5G technology standard is set by China;
"You have to know, Wallace of the United States, that is higher than you do not know where to go, I talked to him and laughed. So the media still have to improve their knowledge level, know how to know? Oh, I also I am anxious for you, really...you don’t want to like to make a big news..." In 2000, as a person growing up, Jiang Zemin gave a message to the reporters of Hong Kong reporters on the media. class.
It is not "take the 5G era", not "rolling Qualcomm", Polar code is not invented by Huawei, LDPC is not Qualcomm. . .
Communication expertise is difficult to understand. This is evident from the curriculum of college students who are complaining about communication. 3Gpp Huawei is really difficult for small editors. Then I tried to make everyone basic in simple language. Awareness.
Two: The truth is always only one
In 1948, Shannon published the "Mathematical Theory of Communication", stating that there are two ways to reliably transmit a signal in a channel with bandwidth determined and noisy: increase the signal-to-noise ratio or add additional to the signal encoding. Error correction code.
Just like in a noisy bar, after the wine is finished, you still want to play a dozen. If you want the waiter to hear it, you have to raise your voice (signal-to-noise ratio) and sip it repeatedly (additional redundant signal).
The theoretical basis of Huawei's Polar code scheme is channel polarization. When the number of combined channels tends to infinity in the 5G era, channel polarization will occur: some channels will tend to be noiseless channels, and others will tend to be full noise channels. The Polar coding strategy is the characteristic that applies this phenomenon. It uses the noiseless channel to transmit useful information of the user (the greater the capability, the greater the responsibility), the information of the full-noise channel transmission agreement or the non-transmission information.
This is like a classmate in a class. If the school time is long enough, most of the poor students will fall to the bottom. Most of the good students will fly to the sky, and then they will abandon those learning...
At present, Polarization (Polar) is the only channel coding technology that can theoretically prove to reach the Shannon limit and has practical linear complexity coding and decoding capabilities.
The Polar code control channel transmits control information, the data packet is small, but the reliability is high; and the data channel is the data transmission, which is a large packet service, and the rate is high. Generally, the two channels need different coding technologies.
Generally speaking, the mobile phone uses the data channel to transmit the traffic of the APP and other services, but there are many mobile phones in the system. At this time, the base station needs to tell the mobile phone how to use the data channel through the control channel, including time, frequency, and signal size. Therefore, in terms of coding technology, Huawei has not completely shaken the status of Qualcomm, it is only a new force in the mobile communications industry.
However, the Polar code is still too young, and it was invented late. Many studies are based on theory. Unlike Turbo codes and LDPC codes, they have been widely used in practical scenarios. In reality, it is not technically high, and the right to speak is the biggest. The United States pushes LDPC codes, and France's main push Turbo 2.0 emphasizes its own interests.
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