Before I begin, let's introduce a news from the previous two days: a certain type of leukemia has been conquered by a pharmaceutical company in Switzerland.

The cure rate is 80%, and the new drug needs to be transported to the United States for synthesis, and the single cost is about 2 million yuan. Book friends can check the news, and then find the handsome doctor next door, Ling Ran, to popularize science.

Keywords: Japan, health insurance, leukemia.

That's right, this thing was included in Japan's medical insurance, and the keyboard warriors were dispatched.

When I mention this news, I actually want to talk about a concept, which is a narrower concept in this single chapter, that is, the sentence that Yang Qing said: science and technology have no borders.

This sentence is not wrong, the Swiss company conquers leukemia, and the whole world benefits.

But he said one less thing: patents have borders!

That's a lot of money!

…………

The reason why it is said that science and technology have no borders is for the next popular science theme: 5G!

In 5G, the technology promoted by domestic manufacturers such as Huawei is not domestic, but the countless patents generated by the research of this technology belong to these companies alone.

First of all, it is a matter of trouble, no matter how you say 5G, who says it, and who you talk to.

In this single chapter, all the statements are very one-sided, very partial, and can be discussed, but there is no need to argue, just let some book friends with vague concepts probably understand some meanings, and the goal will be achieved.

5G is a communication standard (?).

And when it comes to communication, that's where we start today's popular science.

First, let's start with the book's crooked theme: human athletics.

In this sport, there are many ancestors who have made outstanding contributions to the current scene of competitive sports.

However, there is such a person, there is such a woman, who deserves to be remembered by all otaku who love this sport!

She's a super beauty, Hedy Lamarr.

Hollywood Super Beauty!

As a woman born more than a hundred years ago, looking at her photos, I even think she is more beautiful than Marilyn Monroe!

Hedy Lamarr, born in 1914, died in early 2000.

Zhang Ailing said that women should become famous as soon as possible! Located on the other side of the world, her contemporary, Hedy Lamarr, personally interpreted this sentence.

In 1932, when Hedy Lamarr was 18 years old, a Czechoslovak film company invited Hedy Lamarr to play the heroine of "Enchanted" and promised to bring the film to the international market, but on one particular condition!

At present, no film and television materials of "Enchanted" have been found, but the available relevant literature shows that the condition put forward by the film company that year was to require Hedy Lamarr to leave the country naked!

Just imagine, in the 30s of the 20th century, the flower planter was in the middle of the Republic of China, and the ideology was still early to be completely enlightened, and Czechoslovakia was also in the recovery period after World War I, and the whole global environment was not as open as it is now.

In 1933, "Enchanted" premiered in Czechoslovakia, and Hedy Lamarr became the world's first star to appear in the nude, being captivated by men all over the world.

Since then, a new era has come!

I didn't find the image of "Enchanted", which is a very regrettable thing for me, a sports-loving otaku!

Thus, Hedy Lamarr began her legendary life.

Someone summed up Hedy Lamarr's life: "I can write poetry, I can dance ballet, I can go to the big screen at the age of 16, and I can act in the first nude play in human history at the age of 18." can make the man who pursues her unsuccessful commit suicide, can make her six husbands want to commit suicide in front of her, and can sell 680 kisses for more than $17 million to resist**. can turn everyone upside down in Hollywood with bad acting skills, and can engage in scientific research in the field of communications in addition to bad acting skills!"

That's right, this glamorous Hollywood superstar, in addition to being a patriot, she is also a scientific genius!

The time goes back to 1940 during World War II, when Hedy Lamarr and Ansel jointly invented a military communication system that can resist radio interference, that is, "spread spectrum communication technology", which was originally intended to fight against Germany.

In 1941, Hedy Lamarr and composer Gee Antheil were inspired by the way the notes were organized to speculate that a single radio transmission could be sent on multiple frequencies to block interference. This method, known as "frequency hopping", prevents the radio message from being blocked.

In 1942, Hedy Lamarr and George Antheil obtained a patent for "frequency hopping technology" issued by the United States. They donated it as military technology to the U.S. government in the hope of helping World War II. But it didn't get the attention of the U.S. government, and eventually the patent expired.

In the patent description, a method of communication for guiding torpedoes is described, i.e., a synchronous communication between the transmitter and receiver between carrier frequencies for a fixed period of time. The synchronized numbering of carrier frequencies adopted by the transmitting party (an aircraft at a height) and the receiver (a running torpedo) is controlled by a device similar to a player piano music tube, which has a unique sequence of 88 possible steps. This means that by sending only a small part of the entire message on each frequency, the torpedo can be manipulated. Attempts to jam communications can usually only be an attempt at a time when one channel is ineffective, while information on the other channels is sufficient to ensure that the torpedo makes the necessary directional corrections in order to hit the target.

However, due to the technical limitations at that time, this patent was not made in kind, but was sealed by the United States.

I basically don't understand the above professional terms, and I believe that many book friends are also confused like me, so the following text, all the relevant professional terms involved, I try to replace them with other words that I can understand.

Back to the point:

Now there is someone on Heidi. Rama has a comment: "As long as you have used a mobile phone, you need to understand and thank her." You must know that this sexy female star has made an unparalleled contribution to global wireless communication technology. ”

Why?

Because decades ago, but due to the limitations of technology at that time, Heidi's patent was not made in kind, but was sealed by the United States. It wasn't until the 50s, after a private company developed the technology independently (note that it was developed independently), and then rummaged through the patent library to find the patent that it already existed.

Then, in 1988, this technology was developed by Qualcomm, resulting in the most rogues, shameless, and frenzied company in human history that played with the stick of patents - Qualcomm!

And that technology is called "code multiple address"!

If you're confused about its name, then it has another name:

CDMA!

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