Transmission knowledge: wireless transmission and its influencing factors

Wireless fidelity (foreign language abbreviation: WIFI, foreign language full name: WILREless FIdelity), is the most widely used wireless network transmission technology. Actually, it converts wired network signals into wireless signals, which are used by related computers, mobile phones, and PDAs that support their technology. If there is a WIFI function on the mobile phone, when there is a WIFI wireless signal, it will not be able to access the Internet through China Unicom's network, eliminating the traffic charges. However, the WIFI signal is also provided by the cable network, such as the home ADSL ah, residential broadband ah like, as long as a wireless router, you can convert the cable signal into a WIFI signal. The cities of many developed countries abroad are covered with WIFI signals provided by the government or large companies for residents to use. China's current technology has not been promoted.

Wireless LAN, also known as WLAN (Wireless LAN), has become a networking mode adopted by more and more users. Wireless network installation is very convenient and does not require rewiring. Therefore, it will not damage the original home decoration. Compared with wired networks, wireless networks are much more flexible.

In the course of use, we found that although WLAN does not have the trouble of laying cables, and it is convenient to use, sometimes we will find that the signals are not stable and the data transmission speed is slow, and it is basically difficult to achieve the relevant standards. Called wireless router transmission speed. For example, a WLAN network nominally 54Mbps (in fact, the wireless router transmission rate is about 20Mbps), but its display transmission speed is only 11Mbps (the actual transmission rate is about 4Mbps), 5.5Mbps (the actual transmission rate is about 2Mbps) or more Low, how should we deal with this situation?

First of all, we first briefly understand the reason why the data transmission speed of the wireless network slows down. The propagation of radio waves in the air is easily disturbed by various obstacles and interference sources, which naturally causes the WLAN transmission speed to become slower. In addition, the wireless network transmission distance is limited. Although the nominal wireless router can reach a transmission distance of 100 to 300 meters, if there is a block in actual use, the distance will be drastically shortened and data transmission speed will be slowed down.

Knowing why the transmission speed is slow, we can focus on solving this problem. First of all, in the layout we have to grasp, the wireless router and the computer equipped with a wireless network card is best to be able to communicate, try to avoid the wall barrier between them, especially the bearing wall (reinforced concrete wall). We know that in order to reduce the radiation to the human body, the power of the wireless router is generally not very large, so the capacity is affected by the nearby electronic equipment in the process of use. Therefore, when setting the position of the wireless router, we must remember to keep away from the microwave oven. , refrigerators and other home appliances.

A good antenna is also an effective guarantee for ensuring the wireless transmission distance and stability of routers. Some high-end wireless routers use dual antennas. Generally speaking, multi-antenna products are more secure than transmissions of single-antenna products. If possible, we can Try to choose a wireless router with two or more antennas. In addition, the effect of the gain of the antenna on data transmission is also very important. Ordinary routers generally only have an antenna gain of 2dBi omnidirectional antenna, but many high-performance wireless routers are indeed 3dBi or 5dBi omnidirectional antennas. Undoubtedly, under the same circumstances, the performance of a wireless router using a 5dBi omnidirectional antenna is definitely better than that of a 2-3dBi omnidirectional antenna. Therefore, we can improve wireless signal conditions by switching to high-gain antennas.

The matching between wireless routers and network cards is also an important factor in improving the speed of wireless data transmission. We know that there are many standards such as 802.11G, G+, N, and B in the wireless transmission standards on the market. For example, the routers we use are The 108Mbps 802.11G+ standard, but the wireless network card uses the 11Mbps (802.11b) standard, so its actual speed must not reach 108Mbps, then we need to upgrade the network card to achieve the best compatibility. When purchasing related products, we must choose the same standard wireless routers and network cards, so as to minimize the occurrence of compatibility problems.

In front of us, we mainly introduced the impact of hardware on the transmission speed of wireless routers. In terms of software, reasonable settings also help provide wireless routing data transmission speed. We know that most wireless routers now support WEP or WPA encryption. Although the use of encryption effectively improves the security of home networks, it will affect the data transmission speed more or less. For a typical home wireless network, WEP or WPA encryption is not very useful, so we can turn off or disable this feature. In addition, sometimes we can improve the performance of wireless transmission by upgrading the wireless router driver through the Internet connection.

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