Detailed analysis of unstable wireless signals

The signal on the wireless network is unstable. It involves many aspects. Is it a hardware or software problem? Here we need to analyze it in detail. If the hardware of the wireless network is unstable, what is the cause of the unstable wireless signal? Therefore, we need to analyze the various aspects of the wireless signal. So let's take a look at the reasons that affect the stability of wireless signals.

1. wireless signal interference

Because the radio frequency of a wireless LAN uses the ISM (industrial, scientific, and medical) wireless frequency band, The 802.11b 802.119 standard uses the 2.4G band, the 802.11a standard uses the 5.8G frequency band. Therefore, the wireless LAN may be affected by the RF interference of some burst wireless devices in the same frequency band in the actual operating environment. For example, the Bluetooth mobile phone signal in the microwave oven is in the 2.4G frequency Band

So when working in a wireless LAN, a microwave oven is suddenly opened in its area, or a Bluetooth phone uses a Bluetooth headset, or suddenly other wireless devices in the same frequency band interfere with the wireless signal of the wireless LAN, and the physical environment of the wireless network changes, for example, the sudden movement of large obstacles between the Wireless AP and the wireless client will directly lead to a sudden decrease in the network performance of the wireless LAN, and directly lead to wireless signal interruption or speed reduction.

2. wireless signal coverage and penetration

In the home environment, the distance is short. Generally, wireless LAN devices claim that the transmission distance is over 100 meters. Therefore, the signal transmission distance is not a problem, but the home environment brings a new problem, that is, the home space is crowded and the space is not open enough. The walls in the room are the main obstacle. Because the wireless LAN uses the wireless microwave band, the biggest characteristic of microwave is almost linear transmission, the diffraction capability is very weak, so the wireless receiving device behind the obstacle will receive a very weak signal, or the device will not receive the signal to penetrate it.

This is a problem that many netizens are most concerned about. We all hope that wireless signals can penetrate at least the wall in the House to Improve the Ability of wireless signals to penetrate the wall. An effective way is to increase the gain of the antenna, when purchasing Wireless AP, we 'd better choose products with high antenna gain. Generally, at least 2 dBi is required. Based on experience, 2dbi gain antenna signal can penetrate two walls. If there are too many rooms, there are many wall partitions, preferably an antenna that can be split to facilitate the configuration of high-gain antennas, such as replacing an omnidirectional antenna of 5dBi for enhancement.

After understanding the above factors, we need to select an optimal location for the Wireless AP. The requirements for this location are as follows:

The first position should be higher, so that radiation can be carried out in a higher direction, blocking of obstacles can be reduced, and blind spots of signals can be minimized;

The selection of the Two-position point should be to minimize the signal crossing the wall, preferably between the wireless client and the Wireless AP in the room.

Therefore, the best place for Wireless AP at home should be in the living room and be visible to the Computer Host in the room.

3. Performance of Wireless LAN

With the rapid development of wireless LAN, more and more key applications have been run on the wireless LAN, in this way, many common high-bandwidth consumption applications, such as video applications, require the wireless LAN to provide higher bandwidth to achieve high-quality performance! We know that Wireless AP devices are "wireless shared devices" that are connected to wireless client devices and run CSMA/CD over Ethernet (carrier-based multi-channel access/conflict detection ), clearly speaking, it is a "shared" network. The network working principle is the same as that of the previous network hub, but the cable of the hub is discarded and changed to wireless.

Summary: As long as I can correctly understand the wireless characteristics of Wireless LAN and Wireless AP, I can deploy wireless networks at home to make a conclusion on the factors that affect the wireless network: avoid wireless devices in the same frequency band in the wireless network area and avoid interference from wireless channels. The Wireless AP should be placed in a high location. It should be visible to the wireless client as much as possible to avoid blind spots and avoid penetrating too many walls, avoid being blocked by metal obstacles because the wireless network is a shared network, you should avoid heavy traffic, or even cause network blocking BT download software