Three major factors affecting the signals of domestic Wireless LAN

The development of network technology leads to economic prosperity. In such a high-frequency wireless network technology, what should be considered for the establishment of a home lan? Here we will introduce it. There are countless wireless network applications. It is not difficult to build a wireless network in your own house. This article focuses on the wireless signal of the home wireless LAN. It was discussed by some questions about wireless signals. What should I pay attention to in the home wireless lan?

Home wireless LAN signal 1. Interference with wireless signals

Due to the use of the ISM industry, science, and medicine wireless frequency band, 802.11b and 802.119 use the 2.4G band and 802.11a use the 5.8G 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, microwave and Bluetooth mobile phone signals are in the 2.4G band.

So when working in the home 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 signals of the wireless LAN. The physical environment of the wireless network changes. factors such as 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 causes wireless signal interruption or speed reduction.

Another interference is from the home wireless LAN itself, that is, interference from different channels in the same band. This interesting situation occurs when a home user only interferes with the mutual interference of Wireless AP in adjacent or similar buildings on the same floor. Different channels without interference should be used between adjacent Wireless AP devices. For example, 802.11b and 802.11g can eliminate interference by using channels with five different frequencies. Typical non-interference channels are set to Channels 1, 6, and 11 respectively.

Home wireless LAN Signal 2. wireless signal coverage and penetration

In the home environment, the distance is short. Generally, the home wireless LAN equipment claim that the transmission distance is more than 100 meters, so the signal transmission distance is not a problem. However, the home environment brings about 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 obstacles. The wireless LAN uses wireless microwave frequencies. The biggest characteristic of microwave is that it is almost linearly transmitted, and the diffraction capability is very weak. Therefore, wireless receiving devices located behind the obstacle will receive very weak signals or fail to receive signals. What about penetration?

This is what many netizens are most concerned about. We all hope that wireless signals can penetrate the walls of the house at least. To improve the ability of wireless signal to penetrate the wall, an effective way is to improve the antenna gain. We 'd better choose a product with a high antenna gain when purchasing a Wireless AP, generally at least 2 dBi or more. Based on experience, 2dbi gain antenna signals can penetrate two walls. If there are too many rooms and there are too many walls to pass through, it is best to split the device as an antenna to configure a high-gain antenna, such as replacing the 5dBi Omnidirectional Antenna for enhancement.

The obstacle of a metal object not only blocks wireless microwave signals, but also absorbs the electromagnetic energy to generate weak current flow drain. Therefore, the biggest obstacle to a metal object without wireless signals in the home environment is the floor with a steel mesh. The signal in this direction is almost impossible to penetrate. To be able to penetrate, the signal is also very weak. Microwave diffraction is even more impossible for such a large obstacle. If the antenna of the antenna device is placed in the center of the house, wireless signals can only be transmitted straight from the window through open channels.

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

◆ The 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 location should be selected 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.

Home wireless LAN signal 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 the CSMA/CD carrier of Ethernet to listen for Multi-Channel Access/conflict detection ), clearly speaking, it is a "shared" network. It works like a previous network hub. It only discards the cable of the hub and changes it to wireless.

Such a shared environment is an inherent drawback of the wireless LAN, so to use the current network applications normally and smoothly, it is generally recommended that a wireless router or Wireless AP can only access up to 30 wireless clients. Otherwise, the network transmission performance will be greatly reduced. It seems that home users generally do not have so many wireless clients, so it is completely acceptable for home wireless LAN. However, you should try to avoid using P2P download software such as BT and e on the wireless network, because this may paralyze the entire wireless network.

BT and donkey use multipart and multi-point transmission methods to improve the file transmission speed. Btsoftware first divides a file into several parts on the Uploader to provide users with download. When downloading these files, the downloader does not download the split files in order. You do not have to download the remaining parts on the uploaded computers, instead, you can use the distributed cross-download program of btsoftware to download the program to other Downloaders. In this way, the downloader is also responsible for part of the upload, download and upload synchronization, which greatly improves the file download speed, but the premise is that many people download the same file at that download point at the same time. When there are only one or two Downloaders, the download speed will not be very fast.

BT downloads are generally considered to be the heavyweight killer of swallowed up bandwidth. This is exactly the biggest reason many broadband operators have given when announcing the blocking of BT. In a shared network, if BT is used for downloading, other Internet applications will be greatly occupied, slowing down the overall network speed or even causing a "congestion ".

Summary: as long as we can correctly understand the wireless characteristics of Wireless LAN and Wireless AP, home wireless networks can be used very comfortably. To sum up the factors that affect the wireless network, we should avoid wireless devices in the same frequency band in the wireless network area and avoid interference from wireless channels. Wireless AP should be placed in a relatively high location, which should be visible to the wireless client as much as possible to avoid blind spots, avoid penetrating too many walls, and avoid being blocked by metal obstacles. Because the wireless network is a shared network, you should avoid the use of large traffic, or even cause network congestion BT download software.