In the lab!

Ye Fei looked at the ten people under him.

There were 500 people who came to Ye Fei, and Ye Fei divided these 500 people into ten groups, each with 50 people.

Ye Feidao: "Our current job is to develop a new ultra-wideband pulse technology. ”

The carrier channel is called ultra-wideband, and the carrier channel pulse technology is known as the ultra-wideband pulse technology.

"The so-called ultra-wideband pulse technology is the waveform of ultra-wideband."

"Based on the research on ultra-wideband pulse technology at home and abroad over the years, as far as I know, the world's most advanced ultra-wideband pulse technology is studied through orthogonal basis functions."

Whether it's ultra-wideband pulse technology or finding new pulses.

It's all about studying and searching through mathematics.

"But I don't think the orthogonal basis function is the most perfect for the study of pulses."

"The best is through the Gaussian derivative function."

When everyone heard this, they were instantly noisy and discussed with each other softly.

Ye Fei does not stop it, he is not a word, and Ye Fei believes that scientific research needs to have opposing voices.

Only when there are opposing voices can we find the most suitable research direction from many ideas.

After a while, a humane said: "Professor Ye, the use of orthogonal basis functions to study ultra-wide pulse technology has been scientifically proven, and for decades, scientists have found that orthogonal basis functions are the most suitable for studying communication technology." ”

"And you're proposing a Gaussian derivative, and I'm wondering why."

Orthogonal basis function is a common mathematical tool, and its algorithm can find mutually orthogonal base functions in space at high latitudes, so that its base function can be used to represent arbitrarily complex data.

It can be used in the field of signal processing, machine learning......

Ye Feidao: "As we all know, orthogonal basis functions belong to the field of linear algebra, which is often used to study space and latitude. ”

"In this regard, I admit that orthogonal basis functions are really well suited to the field of communication."

"But last year, I found that it is more appropriate to use a Gaussian derivative than an orthogonal basis function."

"The orthogonal basis function is an algorithm that calculates the spectrum utilization and computation time for pulses."

"The orthogonal basis function is flexible and highly utilized in terms of pulses."

"The Gaussian derivative function, on the other hand, has a higher utilization rate than the orthogonal basis function in terms of pulses, with half the utilization rate, and the orthogonal basis function is 30% utilization rate."

"In terms of flexibility, it can find the optimal waveform and perform MATLAB simulations on the linear combination of normalized Gaussian pulse derivation functions."

"So, the orthogonal basis function has the property Gaussian derivative function too, or even better than it."

"That's why I say it's more appropriate to use a Gaussian derivative than an orthogonal basis function."

The crowd looked at each other in confusion.

Although Ye Fei said that the Gaussian derivative function was out of the blue, they did not conduct experiments and were not sure whether what Ye Fei said was true.

Ye Fei said: "In this way, I will write a basic formula for you to study ultra-wideband using the Gaussian derivative function, and you can determine the advantages between it and orthogonal basis functions after reading it." ”

Everyone nodded and said, "Okay!" ”

Ye Fei found a pen and paper and wrote down a set of formulas on it.

"Everyone, look!" Ye Fei handed them the paper with the formula written on it.

The crowd looked at the formula and discussed it with each other.

A humanitarian: "If you look at this set of formulas, if you substitute them, you can determine the signal with a broadband to center frequency ratio of more than 50%. ”

The ratio of broadband to center frequency in ultra-wideband is more than 20%.

This formula allows the ratio of broadband to center frequency to exceed 50%, which means that the network signal studied with this formula is very high.

"Also, the broadband ceiling can reach 200 GHz."

"This means that the research ceiling is higher, and it is also very suitable for Li-Fi's network speed requirements."

The speed of Wi-Fi 6 is 10GHz, and the speed of Li-Fi is 100GHz.

After a while, everyone handed the paper to Ye Fei and said, "Professor Ye, your idea is right, we agree with your point of view, use Gaussian derivative function to study ultra-wideband pulse technology." ”

Ye Fei said with a smile: "Don't worry, we will definitely be able to research ultra-wideband pulse technology." ”

"Hmm!" Everyone nodded.

Academician Ning's office!

Ye Fei knocked on the door and walked in after hearing a call to enter.

Academician Ning saw Ye Fei walking in and said with a smile: "Professor Ye, please take a seat!" ”

After Ye Fei sat down, Academician Ning asked, "How is it, finished talking to the people in your group?" ”

"We're done." Ye Feidao: "We finally decided to use the Gaussian derivative function to study the ultra-wideband pulse technology. ”

"Gaussian derivative?" Academician Ning was surprised: "Don't you use orthogonal basis functions? ”

Ye Fei shook his head: "No, because I have found that the Gaussian derivative function is more suitable for studying communication technology than the orthogonal basis function." ”

Academician Ning said with a smile: "Don't use suspicious people, don't doubt people, I don't ask why you use Gaussian derivative functions, I just want the result." ”

"I don't care what method you use, I just want you to develop ultra-wideband pulse technology."

Ye Fei smiled: "Don't worry, I will definitely study it." ”

Academician Ning said: "Do you need me to help you in any way?" ”

"Money, supercomputing, talent."

"The five hundred people who are following me now, I'm not sure what their ability is, if you want some talents in the future, I want you to provide it to me."

"Yes!" Academician Ning said: "No problem, as long as you need any talents in the future, I can provide them to you." ”

"I don't have it here, I'll dig it from somewhere else through my connections."

"Moreover, this project is a national key project, and many people are staring at it."

"As long as we have talents in China, we will dig them for you."

"I'll give you as much money as you need."

"Supercomputing is the supercomputing of the Rongcheng Supercomputing Center."

The Rongcheng Supercomputer Center was built in the past two years and is located in the southeast corner of Xinglong Lake in Tianfu New District.

"After that, I will call the supercomputing center, and when you use it, go directly to them, and they will let you use it."

"Good!" Ye Fei smiled: "Then I don't have any other requirements." ”

Academician Ning said: "You see it's already more than ten o'clock at this time, you are hungry!" ”

Ye Fei touched his stomach and smiled embarrassedly: "If you don't say it, I haven't reacted yet, I'm really hungry." ”

Ye Fei was busy all day, and he even forgot about his hunger when he was so busy.

"It's me who didn't think it through, let's go, let's go eat."

With that, they stood up and walked outside.

The school cafeteria had already closed after ten o'clock.

So, Ye Fei and the others went to a restaurant near the school to eat.

After eating, the two went back to their quarters to rest.

The next day, in the lecture hall!

Ye Fei summoned all the team members, and all five hundred people were summoned.

Ye Feidao: "After I communicated with the leaders of each group, it was finally decided to study the ultra-wideband pulse technology with the Gaussian derivative function. ”

"I think you all know that!"

Everyone nodded, and they all knew the news last night.

At first, they wondered why they used a Gaussian derivative function.

After the explanation of the team leader, they knew why they used the Gaussian derivative function.

Indeed, it is more appropriate to use Gaussian derivatives to study the field of communication than orthogonal basis functions.

Ye Fei said: "Since you know, I won't explain it again, I'll talk about my research habits." ”

"All the research I have participated in, as long as it is the research I have led, I will say the research direction at the beginning, and the main formula is also derived by me alone."

"Woo......" Everyone looked at Ye Fei in surprise.

Isn't it, you can tell the direction of research at the beginning?

Before you start researching, you know the direction of research?

According to common sense, the research direction can only be known if it is constantly explored in research.

It is not necessary to know the direction of research before you have started research.

Unless the study is simple, or the study has been done before.

But now they're working on ultra-wideband pulse technology, which is very difficult and they haven't studied before.

Therefore, at this moment, it is very unreasonable for Ye to say the direction of research.

What is even more unreasonable is that Ye has to deduce the main formula alone.

The main formula is the most difficult part of the study, and Ye Fei has to deduce it by himself?

You are a man, not a god.

Everyone looked at Ye Fei with suspicion.

Ye Fei didn't care about everyone's eyes, Ye Fei was in contact with them for the first time, and many of Ye Fei's behaviors seemed to them to be incredible.

But Ye Fei did it very easily.

They suspect that Ye Fei is okay now, time will tell.

Ye Feidao: "The research is divided into three parts. ”

"1. Determine the principle of research."

"Second, the pulse of the ultra-wideband system."

"3. Simulation results and analysis."

"Let's start with the principle of research."

"The first thing we need to know is the concept of ultra-wideband."

"The second is radiation masking for ultra-wideband signals."

"Let's talk about the concept of ultra-wideband first, and the current ...... of ultra-wideband"

For a day, Ye Fei was in a meeting with the team members and explained to them in detail how to study.

Many people said in their hearts: "It's all said in such detail, just teach us how to study it, Ye Fei won't have studied ultra-wideband pulse technology!" ”

They found that Ye Fei was too detailed, as if he had personally experienced the research of ultra-wideband pulse technology.

In fact, where is Ye Fei's personal experience of ultra-wideband pulse technology.

Instead, Ye Fei has been in contact with too many scientific researchers over the years, and he has absorbed too much inspiration.

A lot of research, even if Ye Fei has not personally experienced research.

But as long as Ye Fei went to study, a lot of inspiration in his mind exploded in an instant.

Because of this, when Ye Fei talked to them about the research of ultra-wideband pulse technology, they sounded as if Ye Fei had experienced it himself.

Of course, after listening to Ye Fei's detailed explanation, they already knew how to study next.

They're also very easy to study.

This is equivalent to Ye Fei telling them the answer, and then they just copy it.

Of course, the difficulty of copying this and copying homework is naturally different.

But it's certainly an infinite number simpler than their previous research model.

Ye Fei said: "Okay, that's it for today, if there is anything to add in the future, I will convene you again, dismiss!" ”

After speaking, Ye Fei got up and left.

The next day, they began to devote themselves to research.

This time, Ye Fei also started in person.

In the past, after Ye Fei told the group members about the research direction and main formula, he rarely interfered in the research of the group members.

Ye Feixin said: "If you don't get started, you can't do it, this research is too important." ”

"Wi-Fi 7 can restrict 5G, so we need to study Li-Fi before Wi-Fi 7 comes out."

Not to mention the importance of 5G, and Beili is studying Wi-Fi 7.

If Wi-Fi 7 comes out, there will be nothing to resist Wi-Fi 7 at that time.

At that time, something big will happen, and the consequences will be very serious.

Because of this, Ye Fei attaches great importance to the research of Li-Fi.

Even more so than asymmetric encryption algorithms.

After all, there is no sense of urgency in the study of asymmetric encryption algorithms.

And there is a sense of urgency in Li-Fi's research.

Ye Feixin said: "Beili has been developing Wi-Fi 7 for six or seven years, and it should come out soon." ”

"I must develop Li-Fi before Wi-Fi 7 comes out."

North Beauty, Wi-Fi Alliance, Wireless Communication Technology Research Institute!

Dean's Office!

Sierra Berger is the Chief Scientist at the Institute for Wireless Communication Technologies.

He is Professor Emeritus of Electronic Communications at the Massachusetts Institute of Technology and a Fellow of the National Academy of Sciences.

He has won the Marconi International Research Foundation Award.

The Marconi International Research Fund Prize is the highest award in the field of communications and is equivalent to the Nobel Prize in the field of communications.

Here is the difference between a fellow and an academician.

In Beili Kingdom, there is a term for fellowship, and for academicians is for life.

The status of a fellow is one level lower than that of an academician.

Berger said excitedly: "Dean, in nearly a year, Wi-Fi 7 will be developed. ”

"We've spent a lot of effort researching Wi-Fi 7, and now we're finally going to succeed."

The dean smiled, "Very well, Berger, when Wi-Fi 7 is successfully developed, I will report your credit to the authorities." ”

"When the time comes, you run for the dean of the MIT School of Engineering, and the above will help you and let you pass 100 percent."

"Thank you!" Berger laughed, "I'm sure I'll make it." ”

"As soon as Wi-Fi 7 comes out, 5G will be greatly limited."

"Yes!" The dean nodded: "Even if Xia has 5G, we have Wi-Fi7, and we can limit the network speed of 5G." ”

"Hmm!" Berger nodded: "By the way, Xia Guo heard that someone is studying Li-Fi, is this news true?" ”

The dean said disdainfully: "It's true, Li-Fi has a lot of drawbacks, even if it is researched, what if it is studied." ”

"What can't be popularized, it's useless to research it."

"I really don't understand what these guys are doing with Li-Fi."

"Hmm!" Berger nodded.

Neither of them would have imagined that Li-Fi would be a devastating blow to Wi-Fi 7.

In their hearts, they believe that Li-Fi has a fatal flaw, and that it cannot be popularized when it is studied, which means that it is useless to study it.

Berger said: "I heard that there is a person named Ye Fei in Xia Guo, and he developed an asymmetric encryption algorithm, is this true?" ”

The field of communication belongs to the field of computers, and the field of asymmetric encryption algorithms belongs to the field of blockchain.

And blockchain also belongs to the field of computers.

Therefore, there is an intersection between communication and blockchain.

"Hmm!" The dean nodded: "This news is true, and many people in the computer circle know about it now." ”

"But his research is only the theoretical part, and the application part will not come out until a few years."

"I heard that this person named Ye Fei is only 26 years old this year."

"Yes." The dean said: "Many people compare him with Ethereum's V God and say that he is another prodigy of blockchain. ”

Berger said: "Mochizuki Shinichi's consensus mechanism, Xia Guoshutu's distributed ledger of the Blockchain Research Institute, Ethereum's smart contract, plus Ye Fei's asymmetric encryption algorithm. ”

"What if they worked together?"

"It is possible to open the era of Web 3.0."

"Plus 5G support!"

The dean said with some horror: "That will be the end of the world!" ”

Shinichi Mochizuki, Tree Diagram, Ethereum, and Ye Fei.

They can start the Web 3.0 era.

5G is the energy source of Web3.0 and supports the development of Web3.0.

But in this world-changing change, Beili did not participate in anything.

In particular, three-fifths of them were participated by Xia Guo.

This is really the end of the world for Beili Kingdom.

Shinichi Mochizuki is from Dongying, Shutu is from Xia, Ethereum V is from Northern Russia, and now lives in Canada, Ye Fei is from Xia, and 5G is from Xia.

(End of chapter)