This configures the waveform generator to synthesize

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wlanWaveformGenerator along with the VHT packet configuration object vhtCfg. This configures the waveform generator to synthesize an 802.11ac VHT waveform. To generate 802.11n HT or other format waveforms different configuration objects are used such as those created by wlanHTConfig or wlanNonHTConfig. The waveform generator is additionally configured using name-value pairs to generate multiple packets with a specified idle time between packets, and initial scrambler states. The frequency spectrum of the generated time domain waveform, txWaveform, can be viewed using the DSP System Toolbox spectrum analyser. As expected, the 160 MHz signal bandwidth is clearly visible at baseband.
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P a g e | 5 802.11n Waveform Generation
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P a g e | 6 802.11n waveform is generated and transmitted in Matlab containing MAC frames suitable for performing radio packet error rate (PER) receiver tests. WLAN System Toolbox is used to generate standard compliant waveforms for performing receiver tests. An end-to-end simulation is used to determine the packet error rate for an 802.11n HT link with a fading channel at a selection of SNR points. At each SNR point multiple packets are transmitted through a channel, demodulated and the PSDUs recovered. The PSDUs are compared to those transmitted to determine the number of packet errors and hence the packet error rate. Packet detection, timing synchronization, carrier frequency offset correction and phase tracking are performed by the receiver. The processing for each packet is summarized in the following diagram: Waveform Configuration An 802.11n HT transmission is simulated and the HT format configuration object contains the format specific configuration of the transmission. The object is created using the wlanHTConfig function. The properties of the object contain the configuration. In this example the object is configured for a 20 MHz channel bandwidth, 2 transmit antennas, 2 space time streams and no space time block coding.
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P a g e | 7 Channel Configuration Further a TGn N-LOS channel model is used with delay profile Model-B. For Model-B when the distance between transmitter and receiver is greater than or equal to five meters, the model is NLOS.
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  • Fall '16
  • Dr Salim Zahir
  • Protocol data unit, Packet Error Rate, wlanWaveformGenerator

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