![]() % Extract information about channel from the beacon. NonHTData = syncData(ind.NonHTData(1):ind.NonHTData(2)) īitsData = wlanNonHTDataRecover(nonHTData,res.ChanEstNonHT. % Exit while loop as full packet not captured. ![]() % If no non-HT packet is decoded, go to next channel.įprintf( "No non-HT packet detected on channel %d in band %.1f.\n",channels(i),band) įprintf( "Non-HT packet detected on channel %d in band %.1f.\n",channels(i),band)Įnd % Resample the captured data to 20 MHz for beacon processing.ĬapturedData = resample(capturedData,1,osf) Pd.CenterFrequency = centerFrequencies(i) įprintf( "Scanning channel %d on band %.1f.\n",channels(i),band) % Begin scanning and decoding for specified channels. Since beacons transmit every 100 ms, set captureLength to milliseconds(100) and timeout to milliseconds(100). When you call the capture function to detect and capture a signal, you must specify the length of the capture and the signal detection timeout. ![]() Recover the SSID, BSSID, vendor of the AP, SNR, primary 20 MHz channel, current channel center frequency index, supported channel width, frequency band, and wireless standard used by the AP.Ĭheck if the waveform contains another packet that you can decode. Using the recovered MAC frame configuration, check if the non-HT packet is a beacon. Then recover the non-HT data and subsequently decode the MAC protocol data unit (MPDU). Set the center frequency of the preamble detector, then initialize the detection and capture of a waveform for a set duration.Ĭheck if the preamble detector detects an OFDM packet.ĭetermine and apply frequency and timing corrections on the waveform, then attempt to recover the legacy signal (L-SIG) field bits.įrom the recovered L-SIG, extract the modulation and coding scheme (MCS) and the length of the PLCP service data unit (PSDU).
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