Multiple Input Multiple Outputs (MIMO): One of the most widely known components of the draft specification is known as Multiple Input Multiple Output, or MIMO. 802.11n, however, can transmit as high as 140 Mbits per second. For instance, although 802.11g theoretically transmits 54 Mbits of data per second, it only achieves real-world speeds of about 24 Mbits per second because of network congestion. This standard significantly improves speed and range. 802.11n: This is the most recent standard and is becoming commercially available. Similar to 802.11a, 802.11g transmit faster because it uses OFDM instead of CCK. It can transmit upto 54 Mbits per second. The figure below illustrates the single user packet structure of IEEE 802.11ac.Ĩ02.11g: 802.11g transmits at 2.4 Ghz like 802.11b but at faster rates. IEEE 802.11 sends network packets from the sending host to one or more. Wi-Fi, or IEEE 802.11, is the standard for wireless LANs, or WLANs. 802.11b is based on Complementary Code Keying (CCK). It can transmit up to 11 megabits of data per second and it uses Complimentary Code Keying (CCK). This standard transmits in the 2.4 Ghz frequency bandwidth.
Initially, 802.11b was the most popular standard because of its cost, but as faster standards get less expensive, 802.11b is losing popularity. 802.11 b: This is the slowest and least expensive existing standard. This greatly reduced interference between signals. It uses Orthogonal Frequency-Division Multiplexing (OFDM), which is an efficient coding technique that splits the radio signal into several sub signals before they reach a receiver. Figure 1 – 802.11 packet structure 802.11a: The signal is transmitted at 5 Ghz and can move up to 54 megabits of data per second. The figure below shows the packet structure for the 802.11 standard. For this reason, ordinary 802.11 wireless products are no longer manufactured. Unfortunately, 802.11 only supported a maximum network bandwidth of 2 Mbps - too slow for most applications.
They called it 802.11 after the name of the group formed to oversee its development. 802.11 Standards Overview 802.11: In 1997, the Institute of Electrical and Electronics Engineers (IEEE) created the first WLAN standard.
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