Rebirth 2010, the best

Chapter 271 Optimization

Chapter 271 Optimization
The people in white coats in the research lab looked at Lu Yao with some confusion.

If they hadn't known in advance that Huang Feng, a senior professor at the Institute of Advanced Studies, would be bringing two of his junior fellow students with him, these people might have staged a "Who are you? What nonsense are you talking about?"

But reality is not a novel after all. Huang Feng is the senior researcher in charge of this research laboratory. He is their immediate boss and the boss's fellow apprentice. They are closely related and everyone can only treat him politely. They will certainly not rush out to create some embarrassing plot.

Although the research laboratory is engaged in research, it also requires social skills.

No one is stupid.

But the problem is that although they won’t say it explicitly on the surface, the looks in these people’s eyes now reveal that something is wrong.

Looking at Lu Yao, looking at Huang Feng, looking at Professor Sun...

Then I muttered to myself: Who is this person?

Oh yes, Brother Huang seemed to have said that this was his junior fellow student, the top scorer in last year’s college entrance examination.

It seems he's also playing in a band.

But...isn't it a little too outrageous?

This guy.

You have spent less than ten minutes reading our research materials and you have found areas for optimization?

Without machine testing, without running data, and without any evidence, you can optimize with just your mouth?
If you can really optimize... I think all of us should be optimized.

They pondered, speechless.

Huang Feng was also speechless.

Although I know from the teacher that this junior fellow is a genius...but could you please not be so outrageous?
What are you doing… Do you want to optimize the research results that you have finally obtained?

What can you optimize?
The one who was most curious was Sun Liqiang:
"Where did you see the problem?"

"here."

Lu Yao pointed to an icon on the picture.

"This is the report of the chip analysis for the joint debugging of the two-way wireless transmission system. Here, the RAM/FIFO occupancy rate is as high as 70%. What does this mean? It means that a large amount of memory is occupied. With a 70% occupancy rate, there is simply not enough space for the later development modules. In addition, in the analysis and testing of the following modules, in the occupied units of the baseband modules, the information channel decoding has an occupancy rate of 6%, while the three modulation and demodulation of QAM, OFDM, and MIMO add up to only 26, and the channel estimation value is 12. As a result, the synchronization at the bottom is as high as 24%. What does this mean?"

He glanced at Huang Feng.

Huang Feng replied subconsciously:
"The storage unit occupies 24 percent, which means that this module occupies a large amount of memory space. And... it is more than multiple of other units."

"..."

Lu Yao was speechless.

I thought to myself, these things are all out in the open, why should I ask you?

He said:
"Brother, you are right... But what I want to say is that this data shows that there are 1024 points of cross-correlation in the design and implementation of the synchronization module. There must be something wrong with the complex multiplication and complex adder it occupies. Your module must have performed a lot of meaningless complex multiplication and addition, and consumed a lot of logic resources in the implementation process. If the synchronization module can occupy such a large hardware logic dimension, then your subsequent development will definitely have problems because there is not enough space left for you."

"..."

Huang Feng frowned slightly.

Actually, to be honest, this is the test result that the laboratory just got yesterday. This result on LTE transmission baseband is the latest one. And his original intention today was to let the teacher take a look and prove his ability.

To be honest, the current LTE two-way transmission system is already considered a very good system, at least within HiSilicon. If nothing goes wrong, it may be put into next year's mobile phones.

This is the disciple’s achievement and also a “gift” to the teacher.

But who knows...

At this time, Sun Liqiang asked:

"So what do you think we should do?"

Lu Yao glanced at him and shrugged:

"It's simple. Optimization. The 1024-point cross-correlation test used by the senior brothers shows that it consumes too many hardware resources. So we just need to optimize it. First, use the 1024-point cross-correlation test to get as much data as possible, and then perform a 64-point cross-correlation test to remove unnecessary hardware resources, reduce storage space, and improve utilization. This is a necessary step. And if it were me... well, let me think about it."

After a brief thought, he continued:

"I will first check whether the PSS sequence can find the detection position in the wireless frame when it is designed, and then apply the obtained formula to R (I + M) for the received link signal, and S (M) for the locally stored PSS time domain conjugate sequence. Of course, it is necessary to consider the impact of the signal when it is transmitted in different channels and conduct further detection. After normalization, the window energy is set, and then the three groups of local PSS sequences are used in the LTE system to process each other in the time domain, perform sliding cross-correlation with the received link signal, and calculate after obtaining the set to find the synchronization sequence with the maximum cross-correlation value and determine the starting position. This is the detection order."

"..."

Unconsciously, everyone has fallen into thought following the rhythm of his speech.

Then he continued:
"As for the subsequent cross-correlation algorithm optimization, when we perform traditional cross-correlation detection processing, we usually use the middle 1.08MHZ in the frequency domain. But looking at these data, I estimated that the amount of calculation is too large for 10 cross-correlation detection with a system bandwidth of 1024MHZ, so we need to work hard in the frequency domain to see how many signal points to be processed can be obtained, and then use the smallest possible FFT calculation. The next step is to simulate the calculation results, complete the peak detection, and obtain the power and loss of the signal, and in what range it can be done without affecting the work of subsequent modules, and then make improvements. As long as the peak detection is completed, the amount of calculation can be reduced, saving hardware resources for the completion of the process. It's that simple."

"..."

This time, even Sun Liqiang couldn't hold it anymore.

It's that simple?
Simple as shit!
Although...his eyes now gradually turned into amazement.

But what this disciple of mine said was wrong.

This job...is really not easy at all.

The amount of calculation involved is extremely large, absolutely astronomical.

But Huawei definitely has its own supercomputer, so...it doesn't seem difficult.

But then again…

In fact, what the disciple said is not wrong.

Because the difficulties in optimizing the transmission of this LTE baseband have been...solved by him.

The memory usage of the synchronization module is indeed too high.

But there are too many things to consider in optimization... People with different ideas need to make different attempts in order to explore and optimize little by little.

This is the hardest part.

Which should we start with? Which should we sacrifice? Which should we choose?

This is the hardest part.

And now... the most difficult part was solved by his own disciple in just a few minutes.

Although we didn’t get the experimental results, we cannot prove that what Lu Yao said was correct.

But for now...

Sun Liqiang found that this method is the safest and most pertinent.

It will not sacrifice any other modules too much, and even the detection methods and optimization solutions are already available.

If this optimization work takes at least 6 months, then by following this method, the team can save at least 3 months before the test results can no longer confirm that the route is correct.

The reason was simple: the disciple planted a tree himself.

Although I don’t know if it can survive, the tree has roots and a trunk.

He completed the most difficult basic work in a short period of time with an outrageous perspective, while others only needed to follow his ideas to do experiments one by one, get data, and verify.

If the verification succeeds, then the tree is alive.

If the verification fails, at least they have obtained a series of detailed data, which will lay the foundation for subsequent improvements!

In terms of money, assuming that the optimization plan for this LTE two-way transmission system costs one million, then... the disciple's words helped them save at least 60, or even more.

"Tsk."

For some unknown reason, Sun Liqiang suddenly sighed.

Then he took the plan from Lu Yao and handed it to Huang Feng:
"Let's follow what your junior brother said. I agree with the optimization plan he proposed. From the current point of view, it should be correct. First do preliminary testing and demonstration, and then optimize it."

"Uh……"

Huang Feng's look of looking at a monster slowly faded, replaced by recognition:
"Okay, teacher."

After saying that, he looked at Lu Yao again...

The meaning is unclear.

It's just full of incredible things.

This person...

What the hell is this?
……

"Lu Yao."

In the coffee bar inside HiSilicon.

Sun Liqiang looked at the disciple who came back with coffee and suddenly asked:

"Would you like to work here?"

Bai Yao's mouth twitched.

But the next second Lu Yao shook his head without any hesitation:

"Do not want to."

"Uh……"

Sun Liqiang was a little stunned for a moment.

But Bai Yao felt comfortable instantly.

Then I heard Lu Yao say:

"I want to stay at the school. Director Li told me about this two days ago. The main thing is... my research is confidential now. Once it is successfully verified next year, the school will let me join. I want to follow the same path as you, teacher, doing scientific research... and doing scientific research for a company, I think the concept is still different. I think what you do is my ultimate goal."

"..."

For some reason, Sun Liqiang felt warm in his heart.

no……

Why does this sound so comfortable?

Just... whatever I think about it, I feel comfortable.

In fact, he asked this question out of pure curiosity, wondering how his disciple planned to move forward in the future.

Should I go into the academic field or the business field?

Although the two are in a relationship of Jiao is inseparable from Meng and Meng is inseparable from Jiao, there is still a difference in emphasis.

When he heard his disciple say this, he felt relieved.

As for Lu Yao, he actually didn't lie. He really didn't like the kind of work like Huang Feng's lab, where the company gave them clear tasks and they did research and development.

Although their salaries are quite high.

But... money was never a real problem for him. And if he were to live his life again, he would naturally choose to do something that he was more interested in and liked more.

Research cannot be too commercialized.

Someone like a mentor is just right.

Working in a school and affiliated with a company can earn you a lot of money, but you also have more freedom in the type of research you can do.

It's the way he thinks is most comfortable.

……

After staying at Huawei until around 4 o'clock, Sun Liqiang took the two of them away.

In the evening, there was also a dinner with Huang Feng and several other fellow apprentices who were serving in the same school.

This time, Sun Liqiang invited Lu Yao and his companions to come, or rather, brought Lu Yao here, mainly to let his fellow apprentices get to know each other.

Now, this junior brother may trouble his fellow disciples with some things, but in the future, he firmly believes that it will be his other disciples who trouble the junior brother more often.

At times like this, naturally everyone needs to build good relationships.

So, the three of them returned to the hotel and stayed there until the evening. Seven or eight of his fellow students had all gotten off work, and Lu Yao had the chance to see his mentor's team at HiSilicon.

You know what...it's really good.

The brothers and sisters present tonight are all from HiSilicon Research Institute who are in charge of various departments.

Among them, Huang Feng should have the highest status. After all, LTE baseband is a very important technology in the 4G mobile phone era, and the other brothers are actually not doing badly either. Everyone has a bright future.

We drank Maotai at the dinner table and ate all kinds of Shenzhen specialties.

After Lu Yao drank two taels of wine, he felt numb.

In the end, he didn't even know how he got back. He just woke up in his senior's arms on Wednesday and found a bunch of new people's contact information in his phone...

On Wednesday, Sun Liqiang took two people to meet another group of people.

Like him, there are many other distinguished professors who have made achievements in semiconductor technology.

However, the meeting was very short. Everyone just had lunch and then went their separate ways.

Lu Yao did not ask whether these people were from the central laboratory. There was no need. After all, HiSilicon kept the list of these specially appointed professors top secret. This was for corporate security... but in a few years, it would be for national security.

He wasn't in a hurry either.

He will definitely have a hand in the Kirin chip.

By then... we will definitely be in the same industry.

Not in a hurry.

After staying in Shenzhen for a day and a half, we all returned to the Magic City together on Wednesday afternoon.

When they parted at the airport, Sun Liqiang asked Lu Yao to remember to write the report about VIVANTE and send it to him.

And he will also be given some parameters for him to check.

After Lu Yao nodded in agreement, he said goodbye to his tutor and returned to school with his senior schoolmate.

As a result, I received a call from Huang Feng in the evening.

"Hey, Junior Brother, are you busy right now?"

"I'm not busy, Brother. What do you want to talk to me about?"

He asked as he looked at the senior who was putting black stockings on her legs.

You know what...the tall and long-legged senior sister is really lethal in black stockings.

Attack to the extreme.

No wonder girls like him so much...

"It's like this. Today we have submitted the optimization plan for the LTE bidirectional transmission system. It is estimated that... it will be approved in ten days or half a month. I will definitely have to trouble you by then..."

"Haha, Brother, this is really unorthodox."

After slapping away the senior's hand that was touching him randomly, he pointed at the phone speechlessly and then said:
"If you need any help, please feel free to contact me."

"Ha, that's fine. And... I actually mentioned it in my report, saying that this is the optimization idea you provided. Did the teacher get you a guest card?"

"You mean the temporary worker card?"

"Correct."

"It's done."

"Well, Huawei should have your information. Your name is also in this optimization project. After you pass, the company will definitely contact you and your mentor... Then you will definitely be paid."

"Brother, this... uh..."

He looked speechlessly at the senior student squatting in front of him and took a few steps back speechlessly.

Bai Yao smiled triumphantly and began to crawl forward.

Then she grabbed his hand, led it, and made him hook it around the lace collar hanging around her neck.

It was like... he was holding a pet.

In an instant, Lu Yao's face turned red.

"what happened?"

Huang Feng asked.

"It's okay, brother, there's no need to be so polite between us."

"No, you are my junior brother, I will never let you suffer any loss. Don't think this is a piece of cake, junior brother, we make a living by brains, don't we? Even so, I am afraid that the company will pay you too little..."

"Sigh~"

"…Not really, don't gasp. Haha."

Huang Feng thought he was surprised because of "money".

Little did he know that Lu Yao had already sat on the sofa. The reason he took a deep breath was because the senior sister was urging him...

He was distracted for a little too long and she was getting a little impatient.

Seeing this, Lu Yao was speechless, and put his hand on the senior sister's cheek and rubbed it unconsciously:

"Anyway, when you need help, just tell me, brother. I'm sure it will be no problem."

"Ha, that's good. When you come to Shencheng, I'll take you back for a good time!"

"Come on, don't. Didn't you see my drinking capacity that day?"

"Hahaha, don't worry, I won't drink too much this time, but I'm sure you'll have a blast. Hahaha~"

Sometimes...the tacit understanding between men is quite scary.

Lu Yao immediately understood what he was going to do.

There is a tacit understanding that can only be understood but not expressed in words.

Couldn't help but laugh and said:
"Don't tell the instructor that."

"Ha ha ha ha……"

Huang Feng smiled and said:

"Okay, that's it. When the project is approved, I'll tell you in advance."

"Yeah, okay. I'll hang up then?"

"Well, go to bed early, I'm hanging up."

"Ok."

Doodle.

The phone hangs up.

He threw his phone aside, leaned his head back on the sofa and squinted his eyes.

At this time, I heard the senior sister say:
"For this project, tell your supervisor to bring me along. But I won't get involved in your affairs, or you can just assign me a small project to work on... I'll follow you when you go to Shenzhen. It's best to go on Friday or Saturday."

"……Why?"

Lu Yao himself had no intention of abandoning her.

"Because starting from Friday, you usually go to see Xu Ruochu. But if you go on a business trip, from Monday to Sunday, you are all mine!"

"..."

Lu Yao opened his eyes, lowered his head, glanced at her, and asked speechlessly:
"Why are you getting more and more jealous recently?"

"Because I like you more and more..."

Her blurred eyes were full of possessiveness:
"Seven days a week, 24 hours a day...I want to be with you every day."

"Your eyes are scary."

"Is it?"

A hint of redness appeared on that naturally cold face.

She took Lu Yao's hand, which was stroking her cheek, and placed it on her head.

Then he pressed it down slightly.