Shulou(Shulou.com)11/24 Report--

To learn communication, you should start with the doll.

Well, that summer, I took my son to a Qing bar for a drink.

"Boss, two German draft beers with some ice, please!"

Because of the noise in the bar, I was directly ignored.

With a black face, I looked at my son and asked a question.

"Boy, can you think of several ways to accurately and efficiently convey our demand information to the bar owner?"

My baby grew up reading the pictures and texts of the document department. Under the influence of osmosis, this can not defeat him.

He took out a pen and wrote down a formula.

Generally speaking, we can think of this bar information transmission scene as a wireless antenna transmission scene, and the boss's ear as a receiving antenna, because it is impossible to improve the physical laws of controlled ear material and airborne sound, Gt,Gr, wavelength λ.

Therefore, there are and only two ways:

Increase the transmission power Pt (that is, loud and reasonable)

Reduce the distance between sending and receiving (only me if the mountain doesn't come, I'll do it if I go)

After the analysis, my progressive child held his head high and waited for praise.

If the baby is not polished, it will not become a tool. "mm-hmm, not bad, these are two feasible ways."

"however, you do not consider the surrounding noise interference, nor do you consider the channel bandwidth and transmission rate.

After all, we are in a very noisy environment like a bar, and if we increase the amount of information we want to convey, the information will be seriously distorted in the process of transmission. What should you do at this time? "

Take an example that makes it more difficult.

Now, I don't want the German draft beer in front of Daddy.

Yeah,

I'll have a Hendrik martini, hands on ice, with frozen vermouth, dry enough, shake well, don't stir, dip in a little lemon, and tear two olives. Then order a cup of ice Bailey sweet, micro-sugar three-thirds sweet.

And then set a few more premises for you:

Your voice is changing. It can't be any louder.

You can't get any closer to the bar owner.

The bar is very noisy, very loud.

Eva: "." "Dad, you'd better do it yourself."

Of course Jiang is an old hot baby, ah, you watch carefully, poop made a move.

"Ah, is this?. The snapping fingers of the hegemony?

No, Dad, have a drink. Don't just kill the world. "

"."son of a bitch, watch carefully."

Son: "."

"see? this is no ordinary finger snap.

This is every word conveyed in that message, with gestures or sign language added to the poop. "

That's what we're going to talk about today-- channel coding.

Channel coding, also known as error control coding, adds redundant information to the original data at the sender, which is related to the original data, and then detects and corrects errors in the transmission process according to the correlation at the receiver.

The added redundant information is the error correction code, which is used to resist the interference in the transmission process and greatly avoid the occurrence of error code in the information transmission.

The essence of channel coding is to increase the reliability of communication, but because of the increase of redundant information, the total transmission code rate is also fixed in the channel with fixed bandwidth, so that the useful information data in information transmission is reduced.

Even if the noise interference is large, even if some of the signals are distorted during transmission, the bar owner can understand what I mean by the redundant information related to the original information.

"Sir, here comes your wine."

Son: "impressive." no, no, no. "

This article comes from the official account of Wechat: ZTE documents (ID:ztedoc)

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