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Chapter 238 The Future of Radio

The data recorded on the manuscript paper is dense, all of them are first-hand measurement data, and there seems to be no sign at all, but Lin Hong feels more and more that there is a certain law in it. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ《》

The data swirled around in his head, constantly presenting ideas.

After reading everything, Lin Hong's thoughts in his mind were too chaotic, he looked back and found that there was a blackboard on the wall behind him, so he walked over, picked up a piece of chalk, and calculated it on the blackboard.

Although his memory is amazing, writing is still a very good way to store information, you can store some messy information in your mind on the blackboard, so that when you need to consult it, you don't need to continue to search in your mind, you can directly use your eyes to assist, so as to improve the speed of operation.

He writes the data on the blackboard at great speed, aligns it, arranges it, and then wraps it again to form two special matrices, which are then multiplied and transformed, and then the result is re-calculated with another matrix......

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

Lin Hong was immersed in a trance, his mind only had the data he had just seen, as for what these data meant, he didn't know at all, he only knew that by doing so, he could draw the conclusions he wanted.

At this moment, he blocked all the sounds of the outside world, so much so that Wu Fei walked in from the outside without noticing.

"Lin Hong, what are you calculating?" 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 that was writing numbers suddenly paused, he woke up from his trance, and saw that Wu Fei had already stood by his side at some point.

"Uh...... Nothing, just waiting for boredom, remembered a math problem. ”

Lin Hong was also a little surprised that he was in a trance, and he actually wrote the entire blackboard full of numbers.

Wu Fei didn't care, at MIT, it is very common for students to use the blackboard as manuscript paper to calculate, so he asked:

"Do you want to go over there and take a look, it's on the top floor of the greenbuilding."

After all, it's almost the same here. (《》7*

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

"You're welcome. In the future, if you have time, you are welcome to come here to play more, the people here are very friendly, I believe they also want to meet you, the champion of the Asian region, haha! ”

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

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

There was some anxiety on his face, and he said to Lin Hong: "It's Zhang Xin, she accidentally twisted her foot, I have to go over immediately." ”

"Not serious, right?" Lin Hong was erasing the matrix operations he had just written down with the blackboard, and at this time, he had only erased half of it.

"It shouldn't be a big deal, but I have to get there right away, or it's going to be miserable! I don't need to erase the content on the blackboard, I can just erase it when I have time. ”

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

Lin Hong, on the other hand, walked towards the MIT library.

He was still a little puzzled at the moment, just now he had entered a trance state again, this state was no stranger to him, he had experienced it before.

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

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

It's a bit similar to the state of "emptiness" or "epiphany" in Buddhist theory.

"Shouldn't I be looking for what happened to me?"

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

He found that there was definitely a huge 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, and the development of medicine to the present, the understanding of the brain is still very limited.

Lin Hong wanted to understand his brain, but he felt a little at a loss. The latest chapter of the Templar

Reluctantly putting this thought aside, Lin Hong came to the MIT library again.

After a quick reading of the books on VAX/VMS systems that he had not finished in the morning, he went to the area of electronic communications to look for information on satellite communications coding.

This time, though, he didn't find anything very useful.

He has basically dabbled in the techniques described in many of the books here, but it is just in-depth or not.

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

Lin Hong speculated that there may be information about this area blocked, and there is not much useful information to be found in such a public place.

Lin Hong had no choice but to settle for the next best thing, and looked at some of the recent radio communication technologies, which have only been gradually developed in recent years, and are mainly published in some latest radiojournals or magazines.

"Huh?"

Lin Hong saw an article in an authoritative American radio magazine called "QST", and the title of the article made him more interested -- "SWR, the future development direction of radio".

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

In what direction will radio develop today?

Lin Hong read it with curiosity.

In this article, the author proposes a completely new vocabulary, SoftwareRadio, abbreviated as SWR.

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

The article points out that in the 70~80s of this century, radio has experienced a comprehensive development from analog to digital, from no programming to programmability, from less programmable to medium programmability, and finally programmable digital radio.

"Software Defined Radio" is an open public hardware platform that implements the required radio system using different programmable software methods.

The ideal software defined radio should be a fully programmable radio characterized by maximum flexibility in the radio platform. All programmable includes programmable RF bands, channel access modes, and channel modulation.

Lin Hong saw this part of the definition, and immediately lifted his spirits, in fact, the concepts involved in this have already been thought of when he was studying mobile phones before.

The mobile communication system that has emerged now seems to be quite different from the radio communication technology he has seen before, not only the previous radio-based radio communication.

Lin Hong couldn't wait to continue watching.

However, he regretted that this article was only an introductory article, and all the content only stayed on the history of development and the discussion of macro theories, and did 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 increasing, and the hardware system is becoming more and more large......

In order to overcome the problems caused by technical complexity and meet the needs of application diversity, especially the demand for broadband technology in military communications, the method of using different software programming on the basis of general hardware was proposed, and software defined radio came into being.

The revolution of software defined 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 communications make extensive use of software-defined radio technology. The main purpose is to adapt to the pace of development of modern high technology and make the management and maintenance of equipment easier.

Of course, this is all classified technology, and the author does not elaborate on it, but only mentions it slightly.

"Software Defined Radio ......"

Lin Hong recited this concept repeatedly. He was indeed deeply struck by the ideas presented in this article.

When he first came across the concept of a game simulator, he had a similar idea, but at the time, due to the lack of sufficient knowledge, it was just a thought.

The idea of a game simulator is to use software to emulate hardware.

The basic idea of software defined radio is basically similar, relying on a general, standard, modular hardware platform, through software programming to realize various functions of the radio station.

You know, the previous radio stations were all hardware-based and purpose-oriented designs. As a result, their hardware circuits are very single in function and inflexible, and many of them are analog signal processing circuits.

The hardware of the software-defined radio is a bit closer to the computer as a device, emphasizing the versatility, modularity and comprehensive programmability of the platform.

In this way, if you need to add new functions, you used to have to change the hardware configuration, but now you only need to update or upgrade the software.

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

Looking at the time, it was almost four o'clock, so he pedaled his bicycle back.

※※※※※

Lin Hong and Wu Fei had just left the MIT Radio Association activity room with their front feet, and the door of their back feet was reopened.

The people who came in were two middle-aged men, one of whom wore thick eyes and some sloppy hair, and was about sixty years old, who was none other than Professor Murray, the main person in charge of the satellite monitoring project.

The other, dressed in a professional suit and with short, spirited hair, was slightly younger than Professor Murray, Harvey White, a former protégé of Professor Murray, who had just come from San Diego, California.

"Professor, how did your research project come to be carried out in the Radio Association?" Harvey walked in, curiously surveying the room.

"On the one hand, because it is relatively close to the GNSS monitoring station antenna, so 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 he spoke, Professor Murray walked over to the portable ground equipment trolley at the monitoring station, took the surveillance transcript paper recorded by the students in his hand, and looked through it. At the same time, with a look of satisfaction on his face, the records made by his students were very detailed and in line with the requirements.

"The data is already available, let's go, go to my office, and use that mathematical model in the computer to derive ......"

Professor Murray said this, and the words in his mouth suddenly stopped, and he stopped talking very abruptly.

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

"Professor? What's wrong? Harvey asked.