IEEE 802.11n-2009 is an amendment to the IEEE 802.11-2007 wireless-networking standard. The purpose of the standard is to improve network throughput over the two previous standards- 802.11a and 802.11g-with a significant increase in the maximum net data rate from 54 Mbit/s to 72 Mbit/s with a single spatial stream in a 20 MHz channel, and 600 Mbit/s (slightly higher gross bit rate including for example error-correction codes, and slightly lower maximum throughput) with the use of four spatial streams at a channel width of 40 MHz. ![]() The use of MIMO- OFDM (Orthogonal Frequency Division Multiplexing) to increase the data rate while maintaining the same spectrum as 802.11a was first demonstrated by Airgo Networks. It standardized support for multiple-input multiple-output, frame aggregation, and security improvements, among other features, and can be used in the 2.4 GHz or 5 GHz frequency bands.Īs the first Wi-Fi standard that introduced MIMO (Multiple-Input and Multiple-Output) support, sometimes devices/systems that support 802.11n standard (or draft version of the standard) are being referred to as MIMO (Wi-Fi products), especially before the introduction of the next generation standard. The Wi-Fi Alliance has also retroactively labelled the technology for the standard as Wi-Fi 4. IEEE 802.11n-2009, or 802.11n, is a wireless-networking standard that uses multiple antennas to increase data rates. ![]() ![]() *Wi-Fi 0, 1, 2, and 3 are by retroactive inference
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