Duration of OFDM symbol with normal 40 s 1.25 TSYML = TDFT + TGI = TDFT guard interval Duration of OFDM symbol with short guard 36 s 1.125 TSYMS = TDFT + TGIS = TDFT interval or depending on the GI TSYML TSYMS OFDM symbol duration TSYM used 160 s 4 = 80 s 2 STF field duration TSTF = TSYML n.a. 40 s MHz long preamble D-STF field duration TDSTF = TSYML ≥2 160 s 4 80 s 2 + = TDFT = TDFT First LTF field duration + 2 + TGI TGI2 TGI2 40 s Second and subsequent LTF field duration TLTFs = TSYML n.a. 40 s MHz long preamble D-LTF field duration TDLTF = TSYML ≥2 240 s 6 = 80 s 2 SIG field duration TSIG = TSYML TSYML n.a. 80 s 2 MHz long preamble SIGA field duration TSIGA = ≥2 n.a. 40 s MHz long preamble SIGB field duration TSIGB = TSYML ≥2 3.9 S1G PLME 3.9.1 PHY characteristics [12/1104r2, September 2012 meeting minutes] Characteristics Value aSlotTime 52 us aCCATime 40 us aAirPropagationTime 6 us aSIFSTime 160 us
TSYML 40 s = TDFT + TGI = 1.25 TDFT Duration of OFDM symbol with normal guard interval TSYMS 36 s = TDFT + TGIS = 1.125 TDFT Duration of OFDM symbol with short guard interval TSYM TSYML or TSYMS depending on the GI used OFDM symbol duration TSTF 160 s = 4 TSYML 80 s = 2 STF field duration TDSTF n.a. 40 s = TSYML ≥2 MHz long preamble D-STF field duration 160 s = 4 TDFT + 2 TGI + TGI2 80 s = 2 TDFT + TGI2 First LTF field duration TLTFs 40 s = TSYML Second and subsequent LTF field duration TDLTF n.a. 40 s = TSYML ≥2 MHz long preamble D-LTF field duration TSIG 240 s = 6 TSYML 80 s = 2 TSYML SIG field duration TSIGA n.a. 80 s = 2 ≥2 MHz long preamble SIGA field duration TSIGB n.a. 40 s = TSYML ≥2 MHz long preamble SIGB field duration 3.9 S1G PLME 3.9.1 PHY characteristics [12/1104r2, September 2012 meeting minutes] Characteristics Value aSlotTime 52 us aCCATime 40 us aAirPropagationTime 6 us aSIFSTime 160 us