Jiang Xinwei didn't answer, and Mayoni gave her a roll of the eyes.

Mariria was not embarrassed at all, but hugged Jiang Xinwei's head, kissed him fiercely on the mouth, and asked, "Honey, why don't you suddenly stop playing football? There is no one in the world who is as handsome as you. ”

Mayoni was speechless, sneered and said, "Where do you see that he is handsome." It's just a little stupid, okay? Stupid bear's stupid. ”

Mariria said dissatisfiedly, "You're stupid." You're the stupid bear. If you don't think he's handsome, then you give him to me. I love him, you don't like him, then you let it go. ”

Mayoni smiled and said, "But I like to be stupid." He is my man, and he is the one I like, why should I give up? There are many people who like him and love him, and there are not many of you. I think you're just like those fanatical fans, you don't necessarily really love him. ”

Mariria was anxious and said, "You are talking nonsense! I really love him! I can't live without him!"

Jiang Xinwei ignored their quarrel, but thought about the design of the baseband chip for satellite communication in his mind.

The reason why he left the game early was because he found that his brain was very ethereal and his mind was very quick, and he didn't want to waste precious time playing football, so he immediately asked to leave.

Mayoni asked, "How does it feel?"

Jiang Xinwei nodded and said, "The effect is really good. Now I've figured out a complex logic circuit. ”

Mayoni smiled and said, "Hahaha, that's great." …… Otherwise, my dear, you would like to register as a professional player in Italy. ”

Her smile was visibly exaggerated.

But Jiang Xinxu knew that the reason why she did this was purely for Mariria.

Sure enough, Mariria asked suspiciously, "What are you talking about, my dear?" Why don't I understand?"

Mei Aoxue put her fingers up, put them to her mouth, shhh Now he's thinking about something very important. ”

Seeing Mariria looking at her with an inquiring gaze, Jiang Xinwei nodded lightly.

Mariria closed her mouth very aggrieved.

Back at Mayoni's home, Jiang Xinwei took a shower as fast as he could, changed his clothes, and then couldn't wait to enter the studio and began to seriously think about the design of the baseband chip.

Before, he didn't figure out some logic circuits, but now he quickly understood, the most happy thing is that he actually transplanted the circuit design skills related to large-bandwidth communication equipment in his previous life to the design of this baseband chip very easily, so that the channel bandwidth of this baseband chip greatly exceeded what he had designed before, reaching 16M!

At a glance, the bandwidth of 16M is not large, you must know that the current optical fiber communication and optical transmission equipment are often hundreds of megabits, and 655M SDH optical transmission equipment has long been widely used in the telecom transmission market, and 1.25G or even larger bandwidth transmission equipment abounds. The 16M (16 megabit) baseband chip is not pediatric, and it is still worth your Jiang Xinwei to be so happy?

Of course, Jiang Xinwei has a reason to be happy, because the transmission of 655M or above is all taken by optical cables, and the optical fibers in the optical cables are used for communication.

And he designed it to be wireless. What's the use of a high fiber transmission rate, and you can't connect fiber from a ground station to a satellite in space.

Don't look at the bandwidth of 16M, it is not wide, but it can be used on civil communication satellites for thousands or even nearly 10,000 satellite phones!

Because the baseband chip he designed is used for trunk line linking, it is a relay circuit for communication satellites.

It's like a fixed telephone exchange on the ground. Don't look at a telecommunications bureau with thousands of telephones, but there are not many outgoing relay circuits. The reason for this is that the telephone is not used for much time, and most of the time the telephone is idle. Only when the telephone works that it is to make a call, it occupies the relay circuit, and once the phone hangs up, the relay circuit it occupies is released and handed over to other telephones for use.

And satellite phones, digital phones, and landlines don't have the same amount of bandwidth. The bandwidth occupied by each fixed telephone is generally 64K, and a 2M trunk can only accommodate 30 fixed telephones at the same time. However, digital mobile phones occupy only half of the loan, and a 2M trunk can accommodate at least 60 or 62 mobile phone users to talk at the same time.

Although there are many kinds of data on the bandwidth occupied by satellite phones, there are more and some less, but it is completely okay to use the bandwidth occupied by digital mobile phones to layout or calculate the bandwidth of satellite phones.

In this way, a trunk with a bandwidth of 16M can transmit nearly 500 satellite phones to make simultaneous calls. If the number is released at 1:10, it can undertake the communication service of 5,000 satellite phones. If you consider the high rate of satellite phones, that is, the cost of calls per minute is expensive, and the frequency of users using satellite phones is low, you can also reduce the proportion of this number, and you can release the number at 1:20 or even 1:30, then the trunk of this bandwidth can bear more satellite phone users.

Of course, what I just said is only the satellite relay line, which is the connection between the communication satellite and the ground station, or the transmission channel between the communication satellite and the communication satellite, not the transmission channel between the communication satellite and a single satellite telephone, and this channel with a single satellite phone has to design another baseband chip. As with mobile phones, it is also necessary to consider whether to use frequency division multiple access technology or code division multiple access technology.

Different technologies correspond to different designs.

However, it is already a remarkable achievement that Jiang Xinwei can solve the baseband chip design of the communication satellite relay circuit, and other complex chip designs on communication satellites will be carried out in the future.

In fact, even the chip design of this base is not something he can solve alone. A complex chip contains hundreds of millions of semiconductor units and transistors, and a person can't finish the chip design drawing even if he keeps drawing it all his life.

What he needs to do is to clarify the function of the chip, determine the internal logic of the hundreds of millions of transistors, and standardize the data flow inside. As for those repetitive, simple design tasks, they are either left to other engineers to perfect, or simply left to computers to complete.

Jiang Xinwei was busy in the studio for more than four hours, and when he finally finished his basic clues and straightened out most of the logic and process, his head was a little groggy.

And the time is already evening.

Mayonie and Mariria were waiting for him to eat.

Seeing his tired appearance, Mariria said very painfully: "Honey, why are you so tired of yourself? Just after playing football, you plunged into the studio again, you are so tired, you may be tired and sick." ”

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