Chapter 238 The Future of Radio

The data recorded on the manuscript paper is dense, and they are all first-hand measurement data. It seems that there is no sign at all, but Lin Hong increasingly feels that it contains some kind of law. These data hovered in his mind, constantly presenting various ideas.

After reading all the content, Lin Hong's mind was too confused. He looked back and found that there was a blackboard on the wall behind him, so he walked over, picked up a chalk, and brushed it on the blackboard.

Although his memory is amazing, writing is still a very good way to store information. He can store some chaotic information in his mind on the blackboard, so that when he needs to consult, he does not need to continue to search in his mind. He can directly use his eyes to assist, thus improving the speed of calculation.

He wrote these data on the blackboard at a very fast speed, aligned, arranged, and then re-lined to form two special matrices, then multiplied and transformed the two matrices, and then recalcated the obtained result with another matrix...

For a moment, the whole room only heard the sound of Lin Hong writing with chalk.

Lin Hong was immersed in a trance. He only had the data he had just seen in his mind. As for what these data meant, he was completely unclear. He only knew that he could draw the conclusion he wanted by doing so.

At this moment, he blocked all the voices from the outside world, so that Wu Fei did not find it when he came in from the outside.

"Lin Hong, what are you doing?" After Wu Fei approached, he looked at it for a long time and couldn't understand anything, so he asked curiously.

Lin Hong's hand, which was writing numbers, suddenly stopped. He woke up from his trance and saw that Wu Fei was standing beside him at some point.

"Uh... It's nothing. I just got bored waiting and remembered a math problem."

Lin Hong was also a little surprised that he was in a trance and filled the whole blackboard with numbers.

Wu Fei didn't care. In mit, it was very common for students to use the blackboard as manuscript paper, so he asked, "Would you like to continue to go there to have a look? It's on the top floor of the green building."

After all, it's almost here.

Lin Hong thought for a moment and shook his head: "No, let's go next time if there is a chance. I'm going to go to the library to read later. Thank you for feasting my eyes today.

"You're welcome. If you have time in the future, you are welcome to come here more. The people here are very friendly. I believe they also want to meet you, the Asian champion, haha!"

As soon as he finished this sentence, the mobile phone in Wu Fei's pocket rang.

Wu Fei said a few words and hung up the phone.

His face was a little anxious, and he said to Lin Hong, "It's Zhang Xin. She accidentally twisted her foot. I have to go there right away."

"It's not serious, is it?" Lin Hong was erasing the matrix operation content just written with a blackboard. At this time, he only erased half of it.

"There should be no big problem, but I have to rush there immediately, otherwise it will be miserable! There is no need to erase the content on the blackboard. Just erase it when I have time.

So, Wu Fei locked the door of the Radio Association and left in a hurry.

And Lin Hong walked towards the mit library.

He is still a little confused at this moment. Just now, he has entered a state of trance. He is not strange to this state, and he has experienced it before.

In this state, his brain seems to be very efficient, such as memorizing English words and learning and studying algorithmic theory.

However, this situation does not seem to be under his own control, and often enters without warning.

is a bit similar to the "empty" state, or "ephany" state, as mentioned in Buddhist theory.

"Should I find out what happened to me?"

As his thoughts became more and more mature, Lin Hong began to pay attention to the changes that had taken place in him.

He found that there is absolutely a great difference from ordinary people, not just the problem of not being able to sleep.

However, the brain has always been a forbidden area for human beings. With the development of medicine, the cognition of the brain is still very limited.

Lin Hong wants to know his brain, but he feels a little out of a way to start.

With no choice but to put this idea aside, Lin Hong came to the mit library again.

continued to quickly read the books about the vax/vms system that he had not read in the morning, and then went to the electronic communication area to find information about satellite communication coding.

However, he didn't find any very useful information this time.

He has basically dabbled in more or less in the technology described in many books here, but it's just in-depth or not.

However, there is very little information related to the field of satellite communications.

Lin Hong guessed that the information in this regard may have been blocked, and not much useful information can be found in such public places.

Lin Hong had to retreat and take a look at some of the recent radio communication technologies, which have only been gradually developed in recent years, and are mainly published in some of the latest radio journals or magazines.

"Huh?"

Lin Hong saw an article in an authoritative American radio magazine called "qst". The title of the article interested him more - "swr, the future development direction of radio".

Before that, Lin Hong had actually thought about this problem.

In what direction will the radio develop to today?

Lin Hong read it with curiosity.

In this article, the author proposes a new word, softwareradio, abbreviated as swr.

According to the literal meaning in Chinese, it is "software radio".

The article pointed out that in the 1970s and 1980s, radio experienced a comprehensive development from analog to digital, from non-programming to programmable, from less programmable to medium programmable, and finally programmable digital radio appeared.

"Software radio" is an open public hardware platform that uses different programmable software methods to realize the required radio system.

The ideal software radio should be an all-software programmable radio, which is characterized by the maximum flexibility of the radio platform. All programmable includes programmable radio frequency band, channel access mode and channel modulation.

When Lin Hong saw this part of the definition, he suddenly felt refreshed. In fact, he had already thought of the concepts involved when he studied mobile phones before.

The current mobile communication system seems to be quite different from the radio communication technology he saw before, not just the previous radio-based radio communication.

Lin Hong couldn't wait to continue watching.

However, it is a pity that this article is only an introductory article, and all the content only stays in the discussion of development history and macro theory, and does not involve specific technical details.

"...Due to the expansion of the field of radio systems, especially mobile communication systems, and the continuous improvement of technical complexity, the cost of investment is getting larger and larger, and the hardware system is also getting larger and larger...

In order to overcome the problems caused by technical complexity and meet the needs of application diversity, especially the demand for military communication for broadband technology, it is proposed to use different software programming methods on the basis of general hardware, and software radio came into being.

The revolution of software radio will liberate the functions and services of radio from the shackles of hardware..."

Lin Hong reluctantly read this article carefully several times.

In this article, the author also points out that modern satellite communication makes large-scale use of software radio technology. The main purpose is to adapt to the development of modern high technology and make equipment management and maintenance easier.

Of course, the content in this aspect is confidential technology. The author did not discuss it in detail, but just mentioned it a little.

"Software radio..."

Lin Hong read this concept over and over again. He was indeed deeply shocked by the ideas put forward in this article.

When he came into contact with the concept of game simulator, he had a similar idea, but at that time, due to the lack of sufficient knowledge base, he just thought about it.

The idea of the game simulator is to use software to simulate the hardware.

The basic idea of software radio is basically similar. Relying on a general, standard and modular hardware platform, various functions of the radio station are realized through software programming.

You should know that previous radio stations were designed based on hardware and purpose-oriented. As a result, their hardware circuits have very simple functions and poor flexibility, and many of them are analog signal processing circuits.

The hardware of software radio is a little closer to the computer, emphasizing the versatility, modularity and comprehensive programmability of the platform.

In this way, if you need to add new functions, you had to change the hardware configuration in the past, but now you only need to update or upgrade the software. If you really want to add hardware, just plug in a module directly on the general interface like a computer, which is very convenient.

After reading this magazine, Lin Hong looked through other magazines a little and didn't see anything of interest.

Look at the time, it's almost four o'clock, so he stepped on his bicycle and went back.

※※※※※

Lin Hong and Wu Fei just left the mit radio association activity room, and the back door was reopened.

The people who came in were two middle-aged men, one of whom wore thick eyes and had thin hair. He was about 60 years old. He was Professor Murray, the main director of the satellite monitoring project.

The other one, wearing a professional suit and a relatively energetic short hair, is slightly younger than Professor Murray. His name is Harvey White, a former proud student of Professor Murray, who has just come from San Diego, California.

"Professor, how can your research project be carried out in the Radio Association?" Harvey came in and looked at the whole activity room curiously.

"On the one hand, because it is closer to the antenna of the gnss monitoring station, the equipment is easy to move, and on the other hand, of course, because the children here know a lot about radio, and many of my students are members of the association..."

As Professor Murray spoke, he walked to the portable ground equipment car of the monitoring station, took the monitoring record paper recorded by the students in his hand, and looked at it. At the same time, his face showed satisfaction, and the records made by his students were very detailed and met the requirements.

"The data has been obtained. Let's go. Go to my office and use that mathematical model in the computer to deduce..."

Professor Murray said this, and the words in his mouth suddenly stopped, and he stopped as he spoke, which was very abrupt.

Harvey, who was looking at other antique equipment in the activity room with great interest, suddenly didn't hear the professor's words. He suddenly looked back at him with some doubt and found that the other party was looking at the blackboard on the wall.

"Professor? What's the matter? Harvey asked.