WLAN - MCS                                             Home : www.sharetechnote.com

 

 

 

 

MCS stands for Modulation Coding Scheme. It is an indicator by which WLAN specifies the data rate for each frame in 802.11n and 802.11ac. This is the technology to change the data rate dynamically. In theory, AP and the device can change the data rate at every physical frame.

 

 

MCS for 802.11ac

 

802.11ac PHY frame carries a field specifying the MCS field. It means it can change the data rate at every radio frame.

 

 

 

 

Following table is based on 802.11ac-22.5 Parameters for VHT-MCSs. This is a simplified version, you may find several additional parameters for each MCS in 802.11ac specification.

VHT

MCS

Index

NSS

Modulation

R

20 Mhz

Data Rate (Mbps)

40 Mhz

Data Rate(Mbps)

80 Mhz

Data Rate(Mbps)

160 Mhz

Data Rate(Mbps)

800 ns

GI

400 ns

GI

800 ns

GI

400 ns

GI

800 ns

GI

400 ns

GI

800 ns

GI

400 ns

GI

0

1

BPSK

1/2

6.5

7.2

13.5

15.0

29.3

32.5

58.5

65.0

1

1

QPSK

1/2

13.0

14.4

27.0

30.0

58.5

65.0

117.0

130.0

2

1

PQSK

3/4

19.5

21.7

40.5

45.0

87.8

97.5

175.5

195.0

3

1

16-QAM

1/2

26.0

28.9

54.0

60.0

117.0

130.0

234.0

260.0

4

1

16-QAM

3/4

39.0

43.3

81.0

90.0

175.5

195.0

351.0

390.0

5

1

16-QAM

2/3

52.0

57.8

108.0

120.0

234.0

260.0

468.0

520.0

6

1

64-QAM

3/4

58.5

65.0

121.5

135.0

263.3

292.5

526.5

585.0

7

1

64-QAM

5/6

65.0

72.2

135.0

150.0

292.5

325.0

585.0

650.0

8

1

256-QAM

3/4

78.0

86.7

162.0

180.0

351.0

390.0

702.0

780.0

9

1

n/a

n/a

n/a

n/a

180.0

200.0

390.0

433.3

780.0

866.7

0

2

BPSK

1/2

13.0

14.4

27.0

30.0

58.5

65.0

117.0

130.0

1

2

QPSK

1/2

26.0

28.9

54.0

60.0

117.0

130.0

234.0

260.0

2

2

PQSK

3/4

39.0

43.3

81.0

90.0

175.5

195.0

351.0

390.0

3

2

16-QAM

1/2

52.0

57.8

108.0

120.0

234.0

260.0

468.0

520.0

4

2

16-QAM

3/4

78.0

86.7

162.0

180.0

351.0

390.0

702.0

780.0

5

2

16-QAM

2/3

104.0

115.6

216.0

240.0

468.0

520.0

936.0

1040.0

6

2

64-QAM

3/4

117.0

130.0

243.0

270.0

526.5

585.0

1053.0

1170.0

7

2

64-QAM

5/6

130.0

144.4

270.0

300.0

585.0

650.0

1170.0

1300.0

8

2

256-QAM

3/4

156.0

173.3

324.0

360.0

702.0

780.0

1404.0

1560.0

9

2

n/a

n/a

n/a

n/a

360.0

400.0

780.0

866.7

1560.0

1733.3

0

3

BPSK

1/2

19.5

21.7

40.5

45.0

87.8

97.5

175.5

195.0

1

3

QPSK

1/2

39.0

43.3

81.0

90.0

175.5

195.0

351.0

390.0

2

3

PQSK

3/4

58.5

65.0

121.5

135.0

263.3

292.5

526.5

585.0

3

3

16-QAM

1/2

78.0

86.7

162.0

180.0

351.0

390.0

702.0

780.0

4

3

16-QAM

3/4

117.0

130.0

243.0

270.0

526.5

585.0

1053.0

1170.0

5

3

16-QAM

2/3

156.0

173.3

324.0

360.0

702.0

780.0

1404.0

1560.0

6

3

64-QAM

3/4

175.5

195.0

364.5

405.0

n/a

n/a

1579.5

1755.0

7

3

64-QAM

5/6

195.0

216.7

405.0

450.0

877.5

975.0

1755.0

1950.0

8

3

256-QAM

3/4

234.0

260.0

486.0

540.0

1053.0

1170.0

2106.0

2340.0

9

3

256-QAM

5/6

260.0

288.9

540.0

600.0

1170.0

1300.0

n/a

n/a

0

4

BPSK

1/2

26.0

28.9

54.0

60.0

117.0

130.0

234.0

260.0

1

4

QPSK

1/2

52.0

57.8

108.0

120.0

234.0

260.0

468.0

520.0

2

4

PQSK

3/4

78.0

86.7

162.0

180.0

351.0

390.0

702.0

780.0

3

4

16-QAM

1/2

104.0

115.6

216.0

240.0

468.0

520.0

936.0

1040.0

4

4

16-QAM

3/4

156.0

173.3

324.0

360.0

702.0

780.0

1404.0

1560.0

5

4

16-QAM

2/3

208.0

231.1

432.0

480.0

936.0

1040.0

1872.0

2080.0

6

4

64-QAM

3/4

234.0

260.0

486.0

540.0

1053.0

1170.0

2106.0

2340.0

7

4

64-QAM

5/6

260.0

288.9

540.0

600.0

1170.0

1300.0

2340.0

2600.0

8

4

256-QAM

3/4

312.0

346.7

648.0

720.0

1404.0

1560.0

2808.0

3120.0

9

4

n/a

n/a

n/a

n/a

720.0

800.0

1560.0

1733.3

3120.0

3466.7

0

5

BPSK

1/2

32.5

36.1

67.5

75.0

146.3

162.5

292.5

325.0

1

5

QPSK

1/2

65.0

72.2

135.5

150.0

292.5

325.0

585.0

650.0

2

5

PQSK

3/4

97.5

108.3

202.5

225.0

438.8

487.5

877.5

975.0

3

5

16-QAM

1/2

130.0

144.4

270.0

300.0

585.0

650.0

1170.0

1300.0

4

5

16-QAM

3/4

195.0

216.7

405.0

450.0

877.5

975.0

1755.0

1950.0

5

5

16-QAM

2/3

260.0

288.9

540.0

600.0

1170.0

1300.0

2340.0

2600.0

6

5

64-QAM

3/4

292.5

325.0

607.5

675.0

1316.3

1462.5

2632.5

2925.0

7

5

64-QAM

5/6

325.0

361.1

675.0

750.0

1462.5

1625.0

2925.0

3250.0

8

5

256-QAM

3/4

390.0

433.3

810.0

900.0

1755.0

1950.0

3510.0

3900.0

9

5

n/a

n/a

n/a

n/a

900.0

1000.0

1950.0

2166.7

3900.0

4333.3

0

6

BPSK

1/2

39.0

43.3

81.0

90.0

175.5

195.0

351.0

390.0

1

6

QPSK

1/2

78.0

86.7

162.0

180.0

351.0

390.0

702.0

780.0

2

6

PQSK

3/4

117.0

130.0

243.0

270.0

526.5

585.0

1053.0

1170.0

3

6

16-QAM

1/2

156.0

173.3

324.0

360.0

702.0

780.0

1404.0

1560.0

4

6

16-QAM

3/4

234.0

260.0

486.0

540.0

1053.0

1170.0

2106.0

2340.0

5

6

16-QAM

2/3

312.0

346.7

648.0

720.0

1404.0

1560.0

2808.0

3120.0

6

6

64-QAM

3/4

351.0

390.0

729.0

810.0

1579.0

1755.0

3159.0

3510.0

7

6

64-QAM

5/6

390.0

433.3

810.0

900.0

1755.0

1950.0

3510.0

3900.0

8

6

256-QAM

3/4

468.0

520.0

972.0

1080.0

2106.0

2340.0

4212.0

4680.0

9

6

256-QAM

5/6

520.0

577.8

1080.0

1200.0

n/a

n/a

4680.0

5200.0

0

7

BPSK

1/2

45.5

50.6

94.5

105.0

204.8

227.5

409.5

455.0

1

7

QPSK

1/2

91.0

101.1

189.0

210.0

409.5

455.0

819.0

910.0

2

7

PQSK

3/4

136.5

151.7

283.5

315.0

614.3

682.5

1228.5

1365.0

3

7

16-QAM

1/2

182.0

202.2

378.0

420.0

819.0

910.0

1638.0

1820.0

4

7

16-QAM

3/4

273.0

303.3

567.0

630.0

1228.5

1365.0

2457.0

2730.0

5

7

16-QAM

2/3

364.0

404.4

756.0

840.0

1638.0

1820.0

3276.0

3640.0

6

7

64-QAM

3/4

409.5

455.0

850.0

945.0

n/a

n/a

3685.0

4095.0

7

7

64-QAM

5/6

455.0

505.6

945.0

1050.0

2047.5

2275.0

4095.0

4550.0

8

7

256-QAM

3/4

546.0

606.7

1134.0

1260.0

2457.0

2730.0

4914.0

5460.0

9

7

n/a

n/a

n/a

n/a

1260.0

1400.0

2730.0

3033.3

5460.0

6066.7

0

8

BPSK

1/2

52.0

57.8

108.0

120.0

234.0

260.0

468.0

520.0

1

8

QPSK

1/2

104.0

115.6

216.0

240.0

468.0

520.0

936.0

1040.0

2

8

PQSK

3/4

156.0

173.3

324.0

360.0

702.0

780.0

1404.0

1560.0

3

8

16-QAM

1/2

208.0

231.1

432.0

480.0

936.0

1040.0

1872.0

2080.0

4

8

16-QAM

3/4

312.0

346.7

648.0

720.0

1404.0

1560.0

2808.0

3120.0

5

8

16-QAM

2/3

416.0

462.2

864.0

960.0

1872.0

2080.0

3744.0

4160.0

6

8

64-QAM

3/4

468.0

520.0

972.0

1080.0

2106.0

2340.0

4212.0

4680.0

7

8

64-QAM

5/6

520.0

577.8

1080.0

1200.0

2340.0

2600.0

4680.0

5200.0

8

8

256-QAM

3/4

624.0

693.3

1296.0

1440.0

2808.0

3120.0

5616.0

6240.0

9

8

n/a

n/a

n/a

n/a

1440.0

1660.0

3120.0

3466.7

6240.0

6933.3

 

NOTE :

    NSS indicates the number of Spatial Stream.

    R indicates Coding Rate

    GI indicates Gard Interval

 

 

MCS for 802.11ad

 

 

IEEE 802.11ad Table 21-10 Modulation and coding scheme for the control PHY   

MCS Index

Modulation

Code Rate

Data Rate(Mbps)

0

DBPSK

1/2

27.5

 

 

IEEE 802.11ad Table 21-18ŚModulation and coding scheme for SC  

MCS Index

Modulation

N_CBPS

Repetition

Code Rate

Data Rate (Mbps)

1

1

2

1/2

385

2

1

1

1/2

770

3

1

1

5/8

962.5

4

1

1

3/4

1155

5

1

1

13/16

1251.25

6

2

1

1/2

1540

7

2

1

5/8

1925

8

2

1

3/4

2310

9

2

1

13/16

2502.5

10

4

1

1/2

3048

11

4

1

5/8

3850

12

4

1

3/4

4620

 

 

IEEE 802.11ad Table 21-14ŚModulation and coding scheme for OFDM  

MCS Index

Modulation

Code Rate

N_BPSC

N_CPBS

N_DPBS

Data Rate(Mbps)

13

SQPSK

1/2

1

336

168

693.00

14

SQPSK

5/8

1

336

210

866.25

15

QPSK

1/2

2

672

336

1386.00

16

QPSK

5/8

2

672

420

1732.50

17

QPSK

3/4

2

672

504

2079.00

18

16-QAM

1/2

4

1344

672

2772.00

19

16-QAM

5/8

4

1344

840

3465.00

20

16-QAM

3/4

4

1344

1008

4158.00

21

16-QAM

13/16

4

1344

1092

4504.50

22

64-QAM

5/8

6

2016

1260

5197.50

23

64-QAM

3/4

6

2016

1512

6237.00

24

64-QAM

13/16

6

2016

1638

6756.75

 

 

IEEE 802.11ad Table 21-22ŚLow-power SC modulation and coding schemes  

MCS Index

Modulation

Effective Code Rate

Coding Scheme

N_CPB

Rate (Mbps)

25

13/28

RS(224,208)+Block-Code(16,8)

392

626

26

13/21

RS(224,208)+Block-Code(12,8)

392

834

27

52/63

RS(224,208)+SPC(9,8)

392

1112

28

13/28

RS(224,208)+Block-Code(16,8)

392

1251

29

13/21

RS(224,208)+Block-Code(12,8)

392

1668

30

52/63

RS(224,208)+SPC(9,8)

392

2224

31

13/34

RS(224,208)+Block-Code(8,8)

392

2503

 

 

Reference :

 

[1] IEEE 802.11ac-22.5 Parameters for VHT-MCSs

[2] IEEE 802.11ad

    Table 21-10ŚModulation and coding scheme for the control PHY

    Table 21-18ŚModulation and coding scheme for SC

    Table 21-14ŚModulation and coding scheme for OFDM

    Table 21-22ŚLow-power SC modulation and coding schemes

[3] MCS Index for 802.11n and 802.11ac Chart