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Second, we design the IEEE 802.11ax waveform demodulation and analysis algorithm as illustrated in this block diagram. The received IQ baseband waveform from the radio platform will be fed into demodulation and analysis process. In this process, we will detect the data packet from the input IQ raw data, and then the coarse CFO (carrier frequency offset) estimation will be performed and used to correct the data packet. The L-LTF are employed for fine timing, CFO, IQ gain imbalance and quadrature error estimation before the fast fourier transformation. In the frequency domain, the SISO/MIMO channel are extracted with the HE-LTF and the common phase error and the sampling clock offset are estimated and used to correct the data. Finally, the spectral flatness are measured and the EVM (error vector magnitude) can be calculated from the equalized data.
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IEEE/ICACT20230156 Slide.08
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