The principle of how WiFi is worn through walls

Today's home routers usually bring a few antennas, long, the appearance is not good-looking, but most users like, think has the antenna router launch out of the signal will be very good, even in the home more remote corner, mobile phone show WiFi signal is also full, that is to wear a wall effect is very good, is this?

The first thing we need to sort out is the weak WiFi signal for routers and mobile phones.

Because the mobile phone's main function of wireless chip is still receiving, at the same time, taking into account the consumption of batteries, in general, the signal sent out by the router is much stronger than the mobile phone, so that, when we put the router in the living room, the living room received the signal almost in 60-70, after a load-bearing wall, probably attenuation 7-10db, So the cell phone in the bedroom to receive the signal still has 53-60, even if two block wall, there are 46-50, and did not affect the router in the general family coverage.

and the cell phone signal is much weaker, when the one or two-block load-bearing wall, attenuation is particularly bad, the router received the signal will be more difficult to identify the phone, this time the mobile phone received the data sent by the router, will send a confirmation message, told the router it received the current data can continue to send the next data, However, because the router can not identify the confirmation message sent by the phone, it will think that the phone did not receive data, and then try to resend, causing a dead loop, which is why we often see the phone on the wireless WiFi signal is full, but the data transmission is not successful, it is difficult to surf the internet

Generally speaking, how to solve this problem?

In fact, this is a hearing aid problem, the old man's ears are not very good to talk to you, he can't hear you, but he thinks you don't hear him, he tries to speak loudly, like the antenna of our router, the more we do, the more we do, the more we do, the more we do, the longer you hear, he doesn't know yet, but once he's got a hearing aid, Help him to hear you speak, the problem is solved.

WiFi is the same, to the router to add a lot of very long antenna, will only let more families filled with "harsh" WiFi signal, not only to help solve the problem, but produced a surplus of electromagnetic radiation, for the health of the hidden dangers.

The best solution is to improve the ability of the router to listen, this parameter is called acceptance sensitivity, or minimal sensitivity, that is, when the router hears a signal greater than this threshold, the router can identify and process the signal, when the signal is heard less than this threshold, it is considered noise, discarded without processing. In general, there are three ways to improve this acceptance sensitivity, one is to adopt a better enterprise-class WiFi chip, itself more sensitive; the second one is to add an amplifier, but it often leads to other problems; the third is to increase the antenna, increase the gain of receiving signal, but on the one hand, the antenna has directional, Some of the direction of enhancement, but also some of the direction of the weakening, the user will not adjust the direction of the antenna, the antenna is placed in the wrong, as well as no antenna.

I used to be in a global enterprise router company, including in the current technology-driven start-up, there are some ingenious methods, because the WiFi environment is complex, each family is not the same, simply increase this sensitivity, sometimes amplified signal can play a hearing aid, and sometimes amplify the noise, causing hearing aids, called Wah. So if the router automatically collects the surrounding WiFi RF environment information, the use of more intelligent technology, built-in models, so that its own dynamic adjustment of this acceptance sensitivity, often will receive miraculous.

This is why the same is a small box, enterprise routers generally sold to thousands of, tens of thousands of pieces (of course, accept the sensitivity of the factor is only a small reason, there are many similar problems), this time because of the price of the reason in fact, the family is very difficult to use.