Chapter 1015 The Key to the Two-Way Data Link!

After all, Wu Wei is an old engineer who has been immersed in the field of communication technology for many years. Although he was fooled by the new terms created by Chang Haonan at the beginning, he had no difficulty understanding the concepts mentioned by the latter.

Logically speaking, the subsequent work is to find a way to alleviate or even eliminate the self-interference effect caused by the broadcast characteristics.

But... this problem is indeed special.

Because in most cases, self-interference only occurs in wireless multi-hop networks.

Just like the first few rounds of tests just now.

But in actual applications, since you have set up one or more relay stations between point A and point B, it means that the signal sent from A cannot be transmitted stably to B.

There will be no strong self-interference phenomenon.

In other words, the last set of tests just now is closer to reality.

So Wu Wei immediately told Chang Haonan his idea.

The latter did not answer immediately, but just thought with his head down while pacing around car No. 1.

In fact, although Wu Wei knew that Chang Haonan wanted to develop network coding technology, he did not know what he wanted to do in the end.

After all, if we talk about this matter in a big way, it also involves the anti-aircraft carrier system, a powerful weapon.

Although the other party's confidentiality level is not low, the fewer people who know about it, the better.

From the perspective of Wu Wei as a ground relay, what he said is indeed correct.

But satellites, especially low-orbit satellites, are different.

It is not like a car or an airplane, which can move wherever it wants, but can only move according to a specific orbit and period.

This means that it is inevitable that multiple satellites will be gathered together, or two satellites that are directly transmitting data are constantly increasing the distance, and need to connect to a relay satellite in advance for backup.

Therefore, for Chang Haonan, the self-interference problem must be solved.

"That's it, Comrade Wu Wei."

After circling the car for an unknown number of times, Chang Haonan finally stopped in front of Wu Wei again:

"What you just said does make sense, so the research and development of this satellite/scattering communication vehicle will proceed according to the original plan, and the current network coding algorithm will be integrated first, at least so that the informatization pilot unit can have something to use."

"But in the long run, the application scope of this technology will not be limited to military encrypted communications, but will sooner or later expand to industry and even civilian fields, so while continuing to advance the project progress, some resources must be allocated to avoid the impact of self-interference on data transmission."

Such a compromise plan is naturally not difficult for Wu Wei to accept.

He immediately nodded in agreement, and then asked Chang Haonan about his ideas for solving the problem:

"Is Mr. Chang going to continue to develop new algorithms?"

The essence of self-interference is that the receiving station cannot identify the same content signal source sent by different sending stations, so as long as it can be distinguished at the data level, this trouble can be fundamentally avoided.

Therefore, in Wu Wei's opinion, algorithm giants like Chang Haonan may have thought of specific technical solutions.

However, Chang Haonan gave a negative answer:

"This problem is probably difficult to solve with algorithms alone..."

"The basic function of a relay station, even one with encoding and decoding functions, is to ensure that the information content does not change during transmission, so the only solution at the software level is probably to start with the transmission order..."

"But the throughput of relay communication is already tight, and after adding network coding technology, the relay unit is required to have a higher computing power... If the transmission order is adjusted rashly during the signal transmission process, the performance that has been improved with great difficulty may drop back..."

Wu Wei was speechless for a moment.

After a moment of silence, his eyes suddenly lit up:

"Can we start from the hardware and make a special design for the receiver, such as a multi-hop network from A to B to C to D, we can physically let D block the signals from A and B, and only accept the signals sent by C, wouldn't the problem be solved?"

This made Chang Haonan's eyes reveal a hint of surprise... and admiration.

Being able to come up with a completely feasible engineering solution in such a short time without any preparation in advance shows that Wu Wei, as a backbone sent by the 54th Institute, is indeed a bit capable.

He nodded slightly and said:

"This is indeed the most intuitive and effective way."

Wu Wei was a little unresponsive to such a high evaluation:

"So what you mean is... follow this idea..."

Thinking that the solution he accidentally proposed might be adopted, he even felt a sense of unreality.

Then, Chang Haonan poured a bucket of cold water on him:

"But this method is not flexible enough, and it will increase the complexity of the system, so... I am going to use it as a backup plan for now."

"Uh..."

Wu Wei's excited expression froze on his face.

Chang Haonan was also a little amused by the other party's reaction and explained:

"You see, originally my four stations ABCD can send and receive relays in any order, but after the modification as you said, they can only transmit in one direction in the order of A-B-C-D... This is only the case of four nodes. If there are more intermediate nodes involved in the whole process, the hardware waste will be more serious..."

"Hiss——"

Listening to Chang Haonan's description, Wu Wei couldn't help but take a breath of cold air.

Fortunately, the evening in the desert area is cool, so the former did not feel the surrounding temperature drop.

"Mr. Chang, are you... planning to develop a two-way data link that is common to the sea, land and air?"

Almost within a few breaths, Wu Wei keenly guessed Chang Haonan's purpose... one of them.

Although it was only superficial.

"In the long run, yes."

Regarding the data link, Chang Haonan has sent cooperation invitations to many units, so there is no need to hide it.

However, except for Academician Wang Xiaomo, who had foresight, and Wu Wei, who had just been informed, everyone else subconsciously thought that he was just planning to build an air force, or at most a comprehensive command system for the three services.

Since it is a command, it is just a one-way connection from the superior to the subordinate.

But Chang Haonan likes what Ma Weiming said -

If you want to do it, surpass the United States!

Therefore, even if the current conditions are not met, he is still prepared to leave room for upgrading the asymmetric two-way data link in the future.

"Since the software level cannot solve it, the hardware level will bring other problems... Do you have a third route?"

After recovering from the shock, Wu Wei quickly brought the topic back to the self-interference problem discussed before.

"The third route is of course impossible."

Chang Haonan shook his head and said with a somewhat helpless tone:

"But I didn't say that it can't be solved from the hardware level..."

"Huh? Then you just..."

"I just said that the method you proposed has problems. Don't expand the problem to the entire hardware level."

Chang Haonan glanced at Wu Wei and said in a joking tone.

"Ahem——"

Wu Wei suddenly felt a crack that was difficult to heal in his fragile heart...

Chang Haonan finally stopped keeping the secret:

"My idea is that instead of racking your brains to avoid the signals sent by other transmitters, it is better to treat it as useful information, so as to further improve the throughput of the entire multi-hop communication system on the basis of network coding technology!"