CDMA operates in three modes of operation: low frequency bands, i.e., 3.1 to 5.15 GHz, high frequency bands 5.825 to 10.6 GHz, and dual bands 3.1 to 5.15 GHz and 5.825 to 10.60 Hz.

The low-band mode provides a transmission rate of 28.5 to 400 Mbit/s, and the high-band mode provides a transmission rate of 57 to 800 Mbit/s.

In each frequency band exceeding 1 GHz, the data is transmitted with very short time pulses, and the coding gain is achieved by direct sequence spread spectrum of 24 chips, and the error correction method is R-S code and convolutional code .........!"

Liu Lang said quietly while drinking a drink, Ren Weitian is not eating at the moment, he has already taken out a work notebook from his pocket and kept writing.

Liu Lang told him some of the cores of CDMA technology, but how did he know?

In addition to his own professional courses, he also attaches great importance to the communication technology of the United States, and usually reads relevant core journals when he has nothing to do, and has a very good understanding of the current technical level of the United States, and the most advanced CDMA technology is of course within the scope of his key "care".

Stanford University also has semiconductor and radio majors, and he sometimes goes to listen to lectures, not many times, but with his IQ, the academic ability of related majors is no less than that of ordinary undergraduates.

Of course, Liu Lang can only be regarded as just getting started, he knows a lot of technical parameters, but how these parameters came is unknown, not as amazing as in the field of mechanical engineering, this is the importance of the foundation, even if it is as strong as Liu Lang's wisdom, there is no reserve of a lot of basic knowledge, and he is just an ordinary student.

But Liu Lang doesn't need to be comprehensive, because there are many experts in this area in China, and their abilities are actually no less than those scientists and engineers abroad, such as Huang Kun, Zhou Ming and Xie Xide in the chip field, if the time goes back 30 years, their level is not much worse than Gordon Moore, even in the current era when the chip industry has just risen, the level of these people is world-class.

In the previous life, the backwardness of China's chip industry was that it did not keep up with the rapid development of foreign chip technology in the mid-to-late eighties to the late nineties, and in this life, because the emergence of Liu Lang has smoothed out this time, China's chip technology in the future may not be comparable to the United States, but the difference is definitely not too big.

The same is true for the communication industry, it should be said that there is a good foundation in China, as evidenced by a large number of semiconductor factories and radio factories, but like the chip industry, communication technology has not kept up with the trend of the times, especially in wireless communication has been at the world's backward level.

It's not that China doesn't have its own telecommunications company, such as the later Huaxia Mobile, which is also a Fortune 500 company, but what's the use?

"Lao Ren, if you want to do a switch business, I won't stop you, but there is a saying in the communications industry, which is called first-class selling standards, second-rate selling products, and third-rate selling services.

The so-called standard, that is the highest peak of the industry, is the ticket, if you don't meet this standard, no country will choose you, and the best meat will not be eaten.

If you can't eat meat, you can only drink soup, that is, sell products, such as manufacturing switches that meet other people's regulations, don't look at the size of the switch, but in the entire communication process, its profit is less than one-fifth of the technology.

As for the final sale of services, that is the work you are doing now, the switch is not made by you, the technology is not invented, you just buy the machine, and then install it, and it is over, this part of the whole communication project process does not even have a profit of one percent......... Lao Ren, I think you are a person who has achieved great things, and you should not be limited to the most basic business of selling services, but if you want to do it, you must be on par with the highest standards, don't you say?"

Liu Lang felt that Ren Weitian had a big momentum in his heart, which was the fearless courage to move forward bravely, not to advance or die and the aura of forging ahead and climbing the peak, which can be seen from the fact that he was able to leave the "iron rice bowl" in his forties and go to the sea to do business, and later the development of Huaqiang Company can also be seen, that is, twenty years later, when he became an old man who was over the age of old, he also charged into battle with young people, and also made Huaqiang Company full of vitality, but he didn't know these temperaments himself.

When it comes to "playing" people's hearts, there is no stronger person in the world than Liu Lang, especially in the face of these characters who will dominate in the future, Liu Lang's words are like a key, which can ignite the fire in the other party's heart at once.

Ren Weitian is the same, his current wish is to set up a company to serve the telephone business, and after slowly developing, he will make his own switchboard, that's all.

Now Liu Lang's words opened a door for him, and he found that on the other side of the gate, there was an incomparably vast world, but this world was still strange to him, and even nothing, but there was no doubt that there were too many priceless treasures in this world waiting for him to excavate, and any treasure was much more valuable than any exchange, and his previous thoughts were too naïve in front of these treasures.

Of course, Liu Lang said these words, he is also suspicious, and he needs to confirm it himself, but there is no doubt that Liu Lang's words still have a huge effect on him.

But Liu Lang's words are not over.

"Lao Ren, the future development of the world is completely beyond our imagination, what the world will be like in five years, we don't know at all now, as for ten years later, then and now are like two worlds.

Therefore, today's entrepreneurs are full of hope, but also facing danger, the key is whether you can see the development trend of this era, as long as you adapt to this trend, then your business will prosper, but if you can't see the trend clearly, then there is no doubt that your business is difficult to survive.

If you just want to make some money, your switch business is no problem, you can make a millionaire within five years, and it will be difficult to say after five years, after all, the technology content is low, and there are many people who can cross this threshold, and then your competitors will appear in large numbers.

I don't think you are such a short-sighted person, if you want to do it, you have to be the first in the country, no, you can't be the first in the country, you can be the first in the world!"

"No. 1 in .........the world? I'm afraid it's too hard!"

Ren Weitian was infected by Liu Lang's words, and felt that the other party was simply his spiritual mentor, and his every word was a golden and jade relationship, this feeling was really wonderful, just like a depressed scholar suddenly met a fairy, and then leaked the heavenly opportunity to tell him that he could become the champion in the future, which undoubtedly made Ren Weitian's self-confidence burst, but Liu Lang made him the world's No. 1 enterprise, this requirement is still too high, what Qualcomm company has invented CDMA, what is he Huaqiang?

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