How does wifi go through the wall?

How does wifi go through the wall?

Nowadays, home routers generally have several antennas, which are long and difficult to look at. However, most users like it very much and think that the signal sent from the antenna router will be very good, even in a relatively remote corner of the house, the Wi-Fi signal displayed on the mobile phone is also full, that is, the wall-mounted effect is very good. Is that true?

First, we need to clarify the problem that the Wi-Fi signal between the router and the mobile phone is weak.

Because the main function of the wireless chip of the mobile phone is still receiving, and considering the consumption of the battery, generally, the signal sent by the router is much better than that of the mobile phone. In this case, when we put the router in the living room, the signal received in the living room is almost 60-70. After a load-bearing wall is located, the signal attenuation is approximately 7-10 dB. Therefore, the signal received by the mobile phone in the bedroom is still 53-60, even if two load-bearing walls are separated, there are still 46-50, which does not affect the coverage of routers in normal homes.

However, mobile phone signals are much weaker. When one or two load-bearing walls are located, the attenuation is extremely severe, and the signals sent from the mobile phones received by the routers are more difficult to identify, at this time, the mobile phone receives the data sent by the router and sends a confirmation message, telling the router that it has received the current data and can continue to send the next data, however, because the router cannot identify the confirmation message sent by the mobile phone, it will think that the mobile phone did not receive the data, and then keep trying to resend the message, resulting in an endless loop, this is why we often see full Wi-Fi signals on our mobile phones, but data transmission is not successful and it is difficult to access the Internet.

In general, how can this problem be solved?

In fact, this is a problem with hearing aids. The old man's ears are not very good. He can't hear you, but thinks that you didn't hear him, so he tried to make a loud voice, just like the antennas of Our routers, the more you get, the longer you get, the more harsh you get. He still doesn't know, but once you get a hearing aid, help him hear your speech and solve the problem.

The same is true for Wi-Fi. Adding a lot of long antennas to routers will only fill more families with "harsh" Wi-Fi signals, which will not help solve the problem, instead, excessive electromagnetic radiation is generated to pose potential risks to your health.

The best solution is to improve the listening capability of the router. this parameter is called the acceptance sensitivity or the minimum acceptance sensitivity. That is to say, when the router hears a signal that exceeds this threshold, the router can identify and process this signal. When the signal is smaller than this threshold, it is regarded as noise and discarded without processing. In general, there are three ways to improve the sensitivity of this reception. One is to use a better enterprise-level Wi-Fi chip, which is itself more sensitive; the other is to add an amplifier, but it will often lead to other problems; the third is to increase the antenna and increase the gain of the received signal. On the one hand, the increase is limited. On the other hand, the antenna has a direction, and some directions are enhanced, while others are weakened, the user does not adjust the direction of the antenna. If the antenna is placed incorrectly, it is better to have no antenna.

I used to work in a global enterprise-level router company, including a technology-driven start-up company. I have some original methods, because the wifi environment is complicated and every family is not the same, simply increasing the sensitivity, sometimes amplifying the signal can play a role in hearing aid, sometimes also amplified the noise, resulting in hearing aid wow. Therefore, if the router is asked to automatically collect information about the surrounding Wi-Fi RF environment, it will often receive miraculous results by adopting intelligent technologies and built-in models so that it can dynamically adjust the sensitivity.

This is why they are also a small box. enterprise-level routers generally sell thousands or tens of thousands (the sensitivity factor is only a small reason, and there are many similar problems ), at this time, the family is difficult to use because of the price.