The car stopped in front of the University of Electronic Science and Technology of China, Ye Fei got out of the car, the driver opened the trunk, Ye Fei took the luggage down, and then the car drove away.

Ye Fei stood in front of the gate and glanced at the door number above the gate, which read the words 'University of Electronic Science and Technology of China'.

Students come and go in front of the gate.

It was five o'clock in the afternoon, and it was the time for the students to get out of class, and many students went out to play together after class.

Seeing Ye Fei appear at the school gate with a suitcase, many people took a curious look at Ye Fei.

Seeing that Ye Fei was very young, he thought that Ye Fei was also a student.

But are students only enrolling in with suitcases now?

It's not time to start school now!

Because you have to swipe your door card to enter the school, Ye Fei doesn't have a door card.

So, Ye Fei took out his mobile phone and called Academician Ning.

Institute of Wireless Communication Technology, University of Electronic Science and Technology of China, Academician Ning's Office!

"Xiao Liu!" Academician Ning said: "Have the people gone? ”

Xiao Liu is Academician Ning's assistant, a man about 30 years old who wears glasses.

Early in the morning, Academician Ning called Ye Fei and asked him when he would arrive, and Ye Fei said that the plane would be at half past two in the afternoon.

So, at around three o'clock in the afternoon, Academician Ning asked Xiao Liu to send someone to the exit of the airport to guard and pick up Ye Fei.

"Go." Xiao Liu said.

Academician Ning raised his hand, glanced at his watch, and said, "You call and ask, have you received it?" ”

"Okay!"

After Xiao Liu finished speaking, he stepped aside and took out his mobile phone to make a call.

At this time, Academician Ning's mobile phone rang, he took out his mobile phone to take a look, and found that it was Ye Fei's phone.

He hurriedly connected and said with a smile: "Professor Ye, have you arrived?" ”

"It's here!" Ye Fei said: "I'm at the gate of the University of Electronic Science and Technology of China now, you can send someone out to pick me up, I can't get in without a door card." ”

"Huh?" Academician Ning said in surprise: "Didn't my people receive it?" ”

"I came by car."

"Oh, okay, I'll pick you up at the door now."

After hanging up the phone, Xiao Liu came over and said, "Dean, I didn't receive it, he was still waiting at the airport gate." ”

Academician Ning is the head of the Institute of Wireless Communication Technology, and his position is dean.

Academician Ning said: "What to pick up, Professor Ye and everyone have arrived at the school gate, you let him come back, we will pick up Professor Ye at the school gate now." ”

Xiao Liu was stunned for a moment, and then said, "Okay!" ”

After speaking, the two walked out, and on the way, Xiao Liu called the person who picked up Ye Fei to come back.

"Professor Ye!" Academician Ning walked to the gate of the school, greeted Ye Fei with a smile, and shook hands with Ye Fei.

"I'm really sorry to let you come in person, I originally sent someone to pick you up, but the person didn't pick you up."

Ye Fei smiled: "I'm going to say I'm sorry, I didn't make the flight clear." ”

"Let's go!" Academician Ning said, "Let's go in, Xiao Liu, and help Professor Ye get his luggage." ”

"Professor Ye, I'll come!" Xiao Liu walked forward two steps.

Ye Fei said: "No, there aren't many things, I'll come by myself." ”

With that, they walked towards the school.

Along the way, Academician Ning introduced the University of Electronic Science and Technology of China to Ye Fei.

Ye Fei came to Rongcheng for the first time, and he always heard people say that Rongcheng is a very comfortable city.

If you don't enter Sichuan, you won't get out of Shu!

In Rongcheng, there are two things that are most famous, food and beauty.

Rongcheng is also a city with a very developed tourism industry.

This made many people from all over the country gather in Rongcheng.

But because of this, Rongcheng was no longer comfortable and began to roll in.

Ye Fei came to Rongcheng for the first time and didn't have much feeling for Rongcheng.

Entering the Institute of Wireless Communication Technology, Academician Ning said, "I will lead you to meet the people in each research room first. ”

"Good!" Ye Fei nodded.

Xiao Liu stepped forward and said, "Professor Ye, give me your luggage, and I'll send it to your residence." ”

"Thank you!" Ye Fei handed over the luggage to Xiao Liu.

"It's fine!" Xiao Liu smiled: "I should do it." ”

After that, Academician Ning led Ye Fei to meet with the people in various research rooms.

After a long time, the two returned to Academician Ning's office.

"I came to you, mainly to solve the short pulse technology, do you have anything to say?"

Ye Feidao: "If I want to solve the short-pulse technology, I must first know all the information of the research, and then I can help from the short-pulse technology." ”

"It's natural." Academician Ning said: "I will let Xiao Liu give you the information, and after reading it, we will discuss?" ”

"Yes!" Ye Feidao.

In the next time, Ye Fei was looking at Li-Fi's research materials.

A week later!

In an apartment next to the University of Electronic Science and Technology of China, Ye Fei lives in it.

In the study!

At the moment, Ye Fei was chatting with Shesky Marvin, the editor-in-chief of the scientific journal, and Professor Adiva Aiken of Princeton University.

Ye Fei hadn't forgotten that Zhang Yitang recommended him to become a review editor of a scientific journal.

Ye Fei interviewed the review editor of mathematical number theory.

Adiva Aiken is a tenured professor at Princeton University, specializing in number theory.

At the same time, he is an internationally renowned number theorist, most notably for proving the weak BSD conjecture.

The BSD conjecture is one of the seven puzzles of mathematics.

The editor-in-chief said: "Hello Professor Ye, it's a pleasure to meet you, this is Professor Adivar Aiken of Princeton University. ”

Ye Fei said: "Hello! ”

The editor-in-chief said: "I was very happy when Professor Zhang Yitang recommended you, I know that you have proved the ABC conjecture, and I recognize your ability. ”

"So, today, our interview was just a formality."

Ye Fei nodded and said, "Okay!" ”

After that, Ye Fei talked to them about some number theory issues.

After a long time, the editor-in-chief said, "Professor Ye, this is the end of our interview, and soon after, you will receive a membership card from the Beili Association for the Promotion of Science and an invitation letter from a scientific journal. ”

The scientific journal belongs to the North Korea Association for the Promotion of Science, which is the world's largest consortium of science and engineering associations and the world's largest non-profit international science and technology organization.

There are 21 professional chapters, covering natural and social sciences such as mathematics, physics, chemistry, astronomy, geography, and biology.

There are 265 branches and 10 million members.

Its annual meetings are an important gathering of the scientific community, and in recent years, each annual meeting has attracted thousands of scientists and thousands of science journalists.

The platform of the Beili Science Promotion Association is one of the top scientific platforms in the world.

Because of this, Zhang Yitang recommended Ye Fei to become the review editor of a scientific journal.

Becoming a member of the Association for the Promotion of Science in Beili Kingdom gives you access to the world's top scientific scholars.

"Good!" Ye Feidao.

The editor-in-chief smiled: "Goodbye, Professor Ye, I hope to have a happy cooperation in the future work." ”

"Happy working together!"

After speaking, Ye Fei clicked and hung up the video call.

A month later!

Academician Ning's office!

The two were sitting on the sofa drinking tea, and Ye Fei said: "Academician Ning, I have finished reading the information, let me tell you my opinion." ”

"Good!" Academician Ning put down the teacup and said, "You say." ”

Ye Fei pondered for a while and said, "At present, your research scheme is to use the non-carrier pulse scheme, the single-carrier pulse DS-CDMA and MB-OFDM scheme. ”

"Of the two schemes, in terms of advantages and disadvantages, I prefer the carrier-free pulse scheme."

No carrier and single carrier, as well as dual carrier.

These three technologies are the three mainstream technologies in wireless communication at present, and each has its own advantages and disadvantages.

The reason why Ye Fei chose no carrier is because no carrier has the advantages of low system complexity, low power spectral density of transmitted signal, insensitivity to channel fading, low interception ability and high positioning accuracy.

It is especially suitable for high-speed wireless access in indoor dense multipath places.

Of course, carrierless technology is very difficult and requires very high mathematical and communication skills.

Because it does not employ a sinusoidal carrier, it uses a non-sine wave narrow pulse in the nanosecond order to transmit data.

At present, no research institute in Xia Guo owns this technology, and patents must be leased.

In addition to some European countries, there are also countries that have this technology.

Academician Ning nodded and said: "I agree with this, compared with single carrier and dual carrier, of course, no carrier is more suitable." ”

"But, have you ever thought about it."

"We don't have carrier technology in Xia Kingdom, we have to lease technology, but this is subject to others."

"If they get stuck with our technology, then our Li-Fi won't work."

"Don't forget the Wi-Fi Alliance."

"If we wait until we release Li-Fi, the Wi-Fi Alliance can easily make Li-Fi unavailable."

"Therefore, Li-Fi research must be completely domestically autonomous."

After Ye Fei listened, his heart was very heavy.

Completely domestically autonomous, it is light to say, but it is difficult to do.

In the field of communications, foreign countries are much stronger than Xia.

Whether it's the material, or the technology.

Xia Guo wanted to break out of the encirclement, and it was difficult.

In particular, the non-carrier is completely domestically autonomous, and since Xia Guo does not have a non-carrier technology, it is necessary to develop a new non-carrier technology.

After a long time, Ye Fei said: "Academician Ning, then we will develop a new non-carrier technology." ”

Academician Ning's eyes lit up when he heard this, and then his eyes said seriously: "Ye Fei, do you know the difficulty of developing a new carrier-free technology?" ”

The new carrier-free technology requires the search for suitable short-pulse carrier channels.

However, not all short pulse carriers are suitable for wireless communication.

The short-pulse carrier path, which can be easily found, has been found a long time ago.

Short-pulse carriers that are not easy to find are very difficult to find.

"Yes!" Ye Fei said: "But if you don't do it, you will never know if it will be successful, I believe I can." ”

Academician Ning nodded and smiled: "What I was waiting for is your words, I came to you for two purposes." ”

"The first purpose is to study in my previous direction, and you provide short pulse technical support."

"The second purpose is to develop new carrier-free technology, which mainly requires you to develop it."

"I'm glad you can come up with a new carrier-free technology."

"We Xia country scientific researchers should have an indomitable spirit, the more difficult we are, the more we can't lose."

"That's right." Ye Fei said: "Our countless ancestors told us that we, the people of the Xia Kingdom, can't lose, and we should grit our teeth and persist even if it is difficult." ”

Academician Ning nodded and said, "Very good!" ”

Academician Ning saw how Ye Fei liked it at this time, and he liked such a low-key and tenacious person.

In particular, Ye Fei is still young and talented.

After the matter was negotiated, Academician Ning convened a meeting of all the people in the institute!

The Institute of Wireless Communication Technology has thousands of researchers and meets in a large lecture hall.

Academician Ning and Ye Fei sat on the stage, and Academician Ning said, "Ladies and gentlemen, after my discussion with Professor Ye, we have decided to change the direction of our research. ”

The people below instantly whispered to each other, and soon became noisy.

Academician Ning said: "Quiet! ”

After waiting for the quiet below, Academician Ning said: "Our previous research direction was to use a single-load channel, but now it has been changed to a non-loaded road. ”

"But because we don't have carrier-free technology."

"If we want not to be trapped by technology, we must be completely independent and localized."

"So, we're going to develop new carrier-free technologies."

"Woo......" The people below exclaimed, and many people looked at Academician Ning in disbelief.

Someone stood up and said, "Dean, I object, many countries have developed non-carrier technology, but how many have succeeded?" ”

"We can lease no-carrier technology from other countries, develop Li-Fi first, and then consider no-carrier technology."

"We can't even develop Li-Fi, so we want to develop carrier-free technology, so when will our Li-Fi be developed?"

"Dean, Li Bo is right, we should develop Li-Fi first, and then consider other technologies."

"Li-Fi is our ultimate goal, and we can lease the rest of the technology from other countries."

"I don't agree with you, the dean is right, don't you know the importance of Li-Fi!"

"It's about 5G!"

"Wi-Fi 7 can restrict 5G, and Li-Fi can counter Wi-Fi 7."

"As long as Li-Fi is developed, whether it is Wi-Fi 7 or Wi-Fi 8, it will not work."

"Then Li-Fi can't be technically stuck."

"Therefore, Li-Fi must be completely domestically autonomous."

"What Xiao also said is that we must be completely domestically autonomous."

"Do you know how hard it is to have carrierless technology? We can find countries that have good relations with Xia to cooperate. ”

“……”

The audience was like a debate, one side wanted to use foreign leased technology, and the other side wanted to completely make it domestic.

In fact, both sides are quite right.

Renting technology from abroad can save a lot of work, so that Li-Fi can be developed as soon as possible.

But these people only look at the present, not the long-term.

Completely domestic autonomy, although it is very laborious, and even research and development may be far away.

But these people have a long-term vision and think a lot, and in terms of pros and cons, it is more advantageous to be completely domestically autonomous.

After a long time, Academician Ning said, "Okay, everyone, stop!" ”

After everyone quieted down, he said: "Everyone, if you want to think about the advantages of complete domestic independence, what will happen if we develop Li-Fi, but we are stuck in key technologies?" ”

"Have you ever thought about that?"

"You say that you cooperate with countries that have good relations with our Xia country, you must know that there are only interests between countries, and there is no friendship."

"It's better to ask for others than for yourself, and in Li-Fi, I insist on complete domestic independence, and no core technology can be leased from abroad."

Ye Fei saw that many people still disagreed with Academician Ning's point of view, and said, "Academician Ning, let me say a few words!" ”

"Good!" Academician Ning said: "Professor Ye will say a few words below. ”

Ye Fei said with a smile: "Everyone, I have just arrived, and there is something wrong with me, and I hope you Haihan." ”

"First of all, I support complete domestic independence."

"You know the advantages of complete domestic independence, so I won't say more."

"The most difficult thing to achieve complete domestic autonomy is the non-carrier technology, and the R&D director of this technology was handed over to me."

"The research and development of carrier-free technology is mainly to find short-pulse carrier channels through short-pulse technology."

"I have been researching short-pulse technology for many years, and I have also participated in many national key scientific research projects, and most of them are short-pulse technology."

"So, I'm confident in finding a short-pulse carrier path."

Ye Fei saw that many people didn't believe him, and said: "Otherwise, people who want to develop no-carrier technology with me can do research with me, and the rest of them continue to research and develop Li-Fi." ”

Academician Ning said: "I agree with Professor Ye's statement, since everyone has different opinions, then we will work in groups. ”

After the meeting, many people came to Ye Fei to report, and they were all people who agreed to completely make domestic independence.

(End of chapter)