Modulation Coding Schemes, MCS for IEEE 802.11ax

IEEE 802.11ax has a number of defined modualtion coding schemes, ranging from MCS 0 using BPSK for low quality links to MCS 11 using 1024QAM


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In order to optimise the data throughput for all link conditions, IEEE 802.11ax has a series of defined modulation & coding schemes.

These IEEE 802.11ax modulation and coding schemes range from MCS0 using BPSK for the more difficult links, to MCS11 for high quality links which are able to support the highest data throughput.

Between these two extremes there are the other modulation and coding scheme sets that are able to provide different levels of error correction and differnet forms of modulation. There are also different Guard Interval, GI figures that can be used as well.

Table of Modulation Coding Schemes with Associated Data Rates

The table below provides a summary of the various modulation coding schemes available for 802.11ax for the different channel bandwidths and other parameters.

Selecting the right modulation coding scheme is accomplished within the system and depends upon a variety of factors including the wireless communications link quality, the capabilities of the devices and the spectrum available.


IEEE 802.11ax Modulation and coding schemes for single spatial stream
 
MCS
index
Modulation
type
Coding
rate
Data rate (in Mb/s)
20 MHz channels 40 MHz channels 80 MHz channels 160 MHz channels
1600 ns GI 800 ns GI 1600 ns GI 800 ns GI 1600 ns GI 800 ns GI 1600 ns GI 800 ns GI
0 BPSK 1/2 8 8.6 16 17.2 34 36.0 68 72
1 QPSK 1/2 16 17.2 33 34.4 68 72.1 136 144
2 QPSK 3/4 24 25.8 49 51.6 102 108.1 204 216
3 16-QAM 1/2 33 34.4 65 68.8 136 144.1 272 282
4 16-QAM 3/4 49 51.6 98 103.2 204 216.2 408 432
5 64-QAM 2/3 65 68.8 130 137.6 272 288.2 544 576
6 64-QAM 3/4 73 77.4 146 154.9 306 324.4 613 649
7 64-QAM 5/6 81 86.0 163 172.1 340 360.3 681 721
8 256-QAM 3/4 98 103.2 195 206.5 408 432.4 817 865
9 256-QAM 5/6 108 114.7 217 229.4 453 480.4 907 961
10 1024-QAM 3/4 122 129.0 244 258.1 510 540.4 1021 1081
11 1024-QAM 5/6 135 143.4 271 286.8 567 600.5 1134 1201

Note:
    Additional spatial streams multiple the data throughput achievable - above figures are for a single spatial stream.

These

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