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Modulation and Coding Scheme (MCS) in 802.11n wireless LANs is the term used to describe the combination of the radio carrier Modulation scheme, such as BPSK through to 64QAM; and the Coding Scheme, such as rate 1/2 through 5/6, that are used when transmitting data. Each MCS has an associated data rate. For example MCS 0 equates to 7.2Mbps, MCS 15 to 300Mbps and MCS 31 up to 600Mbps using the short 400ns guard interval.

With 802.11n, the factors that affect the data rate include (in each case with an increasing data rate):

- The modulation scheme: BPSK, QPSK, 16-QAM, 64-QAM

- Coding rate: 1/2, 2/3, 3/4, 5/6

- The number of spatial streams: 1, 2, 4

- The number of FEC coders: 1, 2

- The RF channel bandwidth: 20MHz, 40 MHz

- The OFDM Guard Interval: 800ns, 400ns

How to implement MCS

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Tutorials and explanations of other WiFi terms:

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WPA2 is a term used in 802.11 WiFi wireless networks (Wi-Fi Wireless LANs / WLANs).

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