If you have recently visited an airport, cafe, library or hotel, you are more likely to live in the middle of a wireless network. Many people use wireless networks, also known as WiFi or 802.11, to connect their computers at home, and some cities try to use technology to provide residents with free or low-cost Internet access. are doing. Funny wifi names puns In the near future, wireless networks may become so widespread that you can access the Internet anywhere, without cable.
WiFi has many advantages. Wireless networks are easily installed and inexpensive. It is also unclear - until you find a place to watch streaming movies on your tablet, you haven't even noticed when you're in the hotspot. In this article, we will focus on technology that can be used to transmit wirelessly. We will also find out how you can create a wireless network in your home.
First, let's consider some WiFi basics.
What is WiFi?
Wireless networks use radio waves such as cell phones, televisions and radios. In fact, communication over a wireless network is similar to two-way radio communication. The following happens:
The wireless adapter of the computer converts the data into a radio signal and transmits it using an antenna.
The WLN router receives the signal and decodes it. A router sends information over the Internet over a physical, wired Ethernet connection.
The process also works differently in rounds: the router receives information from the Internet, converts it into a radio signal and sends it to the computer's wireless adapter.
The radio used for WiFi communication and is similar to the radio for a walk, key-talkie, cell phone, and other devices. They can send and receive radio waves, and they can convert people and zeros to radio waves and radio waves to zeros and zeros. However, WiFi radios have some important differences from other radios:
They transmit with a frequency of 2.4 GHz or 5 GHz. This frequency is much higher than the frequency used for mobile phones, walk-talkies and televisions. Due to the high frequency, the signal can transmit more data.
They use 802.11 network standards, which are available in various forms:
802.11 transmits at 5 GHz and can transmit 54 megabytes of data per second. It uses th orthogonal frequency division multiplexing (OFFDM), a more efficient coding technique that divides this radio signal into several sub-signals before it reaches the receiver. This greatly reduces interference.
802.11b is the slowest and least expensive standard. Its price has made it popular for some time, but now it has become less popular as increasingly standards have become less expensive. 802.11b is transmitted in the 2.4 GHz frequency band of the radio spectrum. It can process 11 megabytes of data per second and uses CCK (Supplemental Code Keying) modulation to improve speed.
Like 802.11b, 802.11g transmits at 2.4 GHz, but is faster - it can process 54 megabytes of data per second. 802.11g is faster because it uses the same OFFDM coding as 802.11a.
802.11 is the most commonly used standard and is backward compatible with A, B and G. It is much improved in speed and range compared to its predecessor. Although 80802.11g theoretically transfers 54 megabytes of data per second, it reaches an actual speed of about 24 megabytes of data per second due to network congestion. However, 802.11n is reported to reach speeds of up to 140 megabytes per second. 802.11 can transmit up to four data streams, each with a maximum of 150 megabytes per second. However, most routers allow only two or three data streams.
802.11ac is the latest standard since early 2013. It is yet to be widely adopted and is still in draft form at the Institute of Electrical and Electronic Engineers (IEEE). The devices supporting it are already in the market. 802.11ac is backwarded with 802.11n (and others), with N in the 2.4 GHz band and current in the 5 GHz band. It calls for failure and is faster than its predecessor. It transmits a maximum of 450 megabytes per stream, although the actual speed may be slower. Like 802.11n, it enables transmission across multiple spatial streams - optionally up to eight. It is often referred to as 5G because of its frequency band, often because it has a capacity of more than one gigabyte per second, and sometimes because of its throughput (V.H.).