Chapter 1015 The key to 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 confused by the new terms coined by Chang Haonan at the beginning, he had no difficulty in understanding the concepts mentioned by the latter.

Logically speaking, the next step is to find ways to alleviate or even eliminate the self-interference effect caused by the broadcast characteristics.

But...this problem is indeed quite special.

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

Just like the previous rounds of testing.

However, 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 to B stably.

There will not be strong self-interference.

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 lowered his head and thought while pacing around car number one.

In fact, although Wu Wei knew that Chang Haonan wanted to develop network coding technology, he was not clear about what he ultimately wanted to do.

After all, if we talk about it in a bigger way, this matter also involves powerful weapons such as the anti-aircraft carrier system.

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

From Wu Wei's perspective 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 that can move wherever it wants, but can only move along a specific orbit and cycle.

This means that it is inevitable that multiple satellites will be gathered together, or that the distance between two satellites that are directly transmitting data is constantly increasing, and a relay satellite needs to be connected 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 as planned. We will first integrate the current network coding algorithm into it, so that at least 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 industrial and even civilian fields. Therefore, while continuing to advance the project progress, we must also allocate some resources to prevent the self-interference phenomenon from affecting data transmission."

Such a compromise was 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 Chang always ready to continue developing new algorithms?"

The essence of self-interference is that the receiving station cannot identify the same content signal source sent by different sending stations. Therefore, as long as they 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 already come up with specific technical solutions.

However, Chang Haonan gave a negative answer:

"This problem may be difficult to solve with algorithms alone..."

"A relay station, even one with encoding and decoding functions, has the fundamental function of ensuring that the information content does not change during transmission. Therefore, the only solution at the software level is probably to change the transmission order..."

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

Wu Wei was speechless for a moment.

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

"Then can we start from the hardware and specially design the receiver? For example, in a multi-hop network from A to B to C to D, we can physically make D block the signals from A and B and only accept the signals sent by C. Wouldn't that solve the problem?"

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

The fact that he was able to come up with a completely feasible engineering plan in such a short time without any prior preparation shows that Wu Wei, as a backbone member sent by the 54th Institute, is indeed quite capable.

He nodded slightly and said:

“This is indeed the most intuitive and effective way.”

Wu Wei was a little overwhelmed by the sudden high praise:

"So what you mean is... following this line of thought..."

He even felt a little unreal when he thought that the solution he had accidentally proposed might be adopted.

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

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

"Uh……"

The excited expression on Wu Wei's face froze.

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

"You see, originally my four stations ABCD could transmit and receive in any order, but after the modification as you said, they can only transmit in one direction in the order of ABCD... 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.

Fortunately, the evenings in the desert are cool, so the former did not feel the lower temperature around him.

"Boss Chang, are you planning to develop a two-way data link that can be used on land, sea, and in the air?"

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

Even if it's just on the surface.

"In the long run, yes."

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

However, except for Academician Wang Xiaomo who had foreseen this, and Wu Wei who had just been informed, everyone else subconsciously thought that he was only planning to set up an air force, or at most a comprehensive command system for the three armed forces.

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

But Chang Haonan really likes what Ma Weiming said:

If we are going to do it, let’s surpass the United States!

Therefore, even though the current conditions are not met, he is still prepared to leave room for upgrades to future asymmetric two-way data links.

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

After recovering from the shock, Wu Wei quickly brought the topic back to the issue of self-interference that had been discussed previously.

"The third route is of course impossible."

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

"But I never said that it can't be solved from the hardware level..."

"Huh? So you just..."

"What I just said is 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.

"Cough-cough-"

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

Chang Haonan finally stopped keeping the secret:

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