802.11 Wi-Fi Physical Layer and Transmitter Measurements 802.11b (HR/DSSS) 2.4 GHz ch2 ch3 ch4 ch5 ch6 ch7 ch8 ch9 ch10 ch11 ch12 ch13 802.11n (HT) ch14 802.11ac (VHT) Channel # / Center Frequency 2.4 GHz 2.4 GHz Channel Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Primary Channel 1 2 3 4 5 6 7 8 9 2nd Channel 5 6 7 8 9 10 11 12 13 Center Channel 3 4 5 6 7 8 9 10 11 Center Frequency 2422 2427 2432 2437 2442 2442 2452 2457 2462 2.412 GHz 2.437 GHz 2.462 GHz 802.11 IEEE Channel Number 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165 5 GHz Channel Allocation ch1 802.11a and 802.11g (ERP) Spectral Shape and Emission Mask 5170 MHz 5330 MHz 5490 MHz 5710 MHz 5735 MHz Unfiltered Sinx/x -20 dBr -28 dBr -30 dBr -50 dBr A 9 MHz 19 MHz 39 MHz 79 MHz B 11 MHz 21 MHz 41 MHz 61 MHz C 20 MHz 40 MHz 80 MHz 160 MHz D 30 MHz 60 MHz 120 MHz 240 MHz -40 dBr Packet Information Bits: Preamble Header Payload Data 144 or 72 bits 48 bits N bits DSSS1M Mod (1:11)* Mod DSSS1M (1:11)* or DSSS2M (2:11)* Preamble Mod STF 2 symbols IQ: DBPSK DBPSK or DQPSK DBPSK or DQPSK or CCK5.5M or CCK11M 1584 or 792 chips 528 or 264 chips Legacy (a/g) Preamble DSSS1M (1:11)* or DSSS2M (2:11) or CCK5.5M (4:8) or CCK11M (8:8) LTF 2 symbols 8 usec 8 usec (160 chips) (160 chips) SIGNAL L-STF Data 1 symbol N symbols 4 usec (80 chips) N * 4 usec (N*80 chips) L-LTF HT L-STF HT-SIG HT-STF HT-LTF Subcarriers (20/40/80/160 MHz) Preamble Subcarriers (20-40 MHz) Legacy (a/g) L-STF Data L-LTF Data L-SIG VHT-SIGA VHT-STF VHT-LTF VHT-SIGB N*K chips (N*K) / 11* 10e-6 usec 192 usec (Long) or 96 usec (Short) Transmitter Measurements Data Rates and Modulation Types * (N:M) = (Nbits:Mchips), K= M / N 802.11b Signal Field HEX Data Rate 0A 14 37 6E 1 Mbps 2 Mbps 5.5 Mbps 11 Mbps Type of Measurement Transmit Power Transmit Spectral Transmit Frequency Based on IEEE802.11-2012 standard. www.tektronix.com/mdo4000 Spreading/ Coding Scheme 11 chip barker code 11 chip barker code CCK CCK 802.11a/g (20 MHz Bandwidth) DBPSK DQPSK DQPSK DQPSK Measurement Transmit Power Transmit Power On/Off Ramp Transmit Spectrum Mask RF Carrier Suppression Center Frequency Leakage Transmit Spectral Flatness Transmission Spurious Out-of-band Spurious Emission Transmit Center Frequency Tolerance Symbol Clock Frequency Tolerance Rate 1101 (13) 1111 (15) 0101 (5) 0111 (7) 1001 (9) 1011 (11) 0001 (1) 0011 (3) Modulation Modulation BPSK BPSK QPSK QPSK 16QAM 16QAM 64QAM 64QAM 802.11 DSSS Yes Yes Yes Yes b Yes Yes Yes Yes a Yes Yes g Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes n Yes Yes Yes Yes Yes Yes Yes Yes MCS 0 1 2 3 4 5 6 7 8 9 Modulation BPSK QPSK QPSK 16QAM 16QAM 64QAM 64QAM 64QAM 256QAM 256QAM Type of Measurement 802.11ac FEC Rate 20 MHz 7.2 Mbps 14.4 Mbps 21.7 Mbps 28.9 Mbps 43.3 Mbps 57.8 Mbps 65.0 Mbps 72.2 Mbps 3/4 1/2 3/4 1/2 3/4 2/3 3/4 5/6 3/4 5/6 Yes Yes Country Dependent (10% - 90%) 2 us Standard Mask -15 dB -15 dBc or +2 dB w.r.t. averages subcarrier power -20 dBc or +0 dB w.r.t. averages subcarrier power ± 4 dBc, + 4/-6 dB (various BWs, 20 - 160 MHz) Country Dependent Country Dependent ± 25 ppm (DSSS, b, g) ± 20 ppm (20 MHz and 10 MHz), ± 10 ppm (5 MHz) ± 20 ppm (5 GHz band), ± 25 ppm (2.4 GHz band) same specifications as above Transmit Modulation Data Rate (SISO: 1 Stream, Short Guard Interval) 40 MHz 20 MHz 40 MHz 80 MHz 15.0 Mbps 7.2 Mbps 15.0 Mbps 32.5 Mbps 30.0 Mbps 14.4 Mbps 30.0 Mbps 65 Mbps 45.0 Mbps 21.7 Mbps 45.0 Mbps 97.5 Mbps 60.0 Mbps 28.9 Mbps 60.0 Mbps 130 Mbps 90.0 Mbps 43.3 Mbps 90.0 Mbps 195 Mbps 120.0 Mbps 57.8 Mbps 120.0 Mbps 260 Mbps 135.0 Mbps 65.0 Mbps 135.0 Mbps 292.5 Mbps 150.0 Mbps 72.2 Mbps 150.0 Mbps 325 Mbps 86.7 Mbps 180.0 Mbps 390 Mbps 200.0 Mbps 433.3 Mbps Measurement ac 20 MHz 40 MHz Yes Data Rate 6 Mbps 9 Mbps 12 Mbps 18 Mbps 24 Mbps 36 Mbps 48 Mbps 54 Mbps IEEE Standard Limit Yes Yes FEC Rate 1/2 3/4 1/2 3/4 1/2 3/4 2/3 3/4 802.11n Transmit Modulation Accuracy 802.11 DSSS Yes b a g ac Peak EVM<0.35% Peak EVM<0.36% Yes Transmitter Constellation Error Modulation Type Coding Rate BPSK BPSK QPSK QPSK 16-QAM 16-QAM 64-QAM 64-QAM 64-QAM 256-QAM 256-QAM 1/2 3/4 1/2 3/4 1/2 3/4 2/3 3/4 5/6 3/4 5/6 Limits in dB -5 -8 -10 -13 -16 -19 -22 -25 160 MHz 65 Mbps 130 Mbps 195 Mbps 250 Mbps 390 Mbps 525 Mbps 585 Mbps 650 Mbps 780 Mbps 866.7 Mbps IEEE Standard Limit n -5 -5 -10 -13 -16 -19 -22 -25 -27 -10 -13 -16 -19 -22 -25 -27 -30 -32 Europe (ETSI) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Japan ROW Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 802.11b only Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No 5 GHz Spectral Mask for 20, 40, 80, and 160 MHz Channels Channel Size 20 MHz 40 MHz 80 MHz 160 MHz North America (FCC) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No 5835 MHz 0 dBr Transmit Spectrum Mask Center Frequency 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472 2484 Channel Number 36 38 40 42 44 46 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165 Center Frequency 5180 5190 5200 5210 5220 5230 5240 5260 5280 5300 5320 5500 5520 5540 5560 5580 5600 5620 5640 5660 5680 5700 5745 5765 5785 5805 5825 U.S. Europe Japan China Yes No Yes No Yes No Yes DFS DFS DFS DFS DFS DFS DFS DFS DFS No No No DFS DFS DFS Yes Yes Yes Yes Yes Indoors No Indoors No Indoors No Indoors Indoors/DFS/TPC Indoors/DFS/TPC Indoors/DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC SRD SRD SRD SRD SRD Yes Client Only Yes Client Only Yes Client Only Yes DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC No No No No No Yes No Yes No Yes No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No Yes Yes Yes Yes Yes 5 GHz Channel Number 36 38 40 42 44 46 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165 Center Frequency 5180 5190 5200 5210 5220 5230 5240 5260 5280 5300 5320 5500 5520 5540 5560 5580 5600 5620 5640 5660 5680 5700 5745 5765 5785 5805 5825 Korea Australia Brazil Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No Yes Yes Yes Yes Yes Yes No Yes No Yes No Yes DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC DFS/TPC No No No DFS/TPC DFS/TPC DFS/TPC Yes Yes Yes Yes Yes Indoors Indoors Indoors Indoors Indoors Indoors Indoors Indoors Indoors Indoors Indoors DFS DFS DFS DFS DFS DFS DFS DFS DFS DFS DFS Yes Yes Yes Yes Yes DFS = Dynamic Frequency Selection TPC = Transmit Power Control SRD = Short Range Devices 25 mW max power
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