[Discuss-gnuradio] ofdm channel estimation

Hi all:

         Have you ever using the gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc?And I change the rx_ofdm.py as follows:

         self.connect((self.digital_ofdm_chanest_vcvc_0, 1), blocks.file_sink(gr.sizeof_gr_complex * fft_len, 'channel-estimate.dat'))

         And i use the matlab:

        csi=read_complex_binary('channel-estimate.dat');plot(1:64,real(csi(1:64,1)),'rs-')

       The result is attached.But I think the result is wrong.Have someone do the similar thing like me?Can we discuss this?

       Environement: 2 USRP N210 and SBX

       Thank you.

Best regards,

xd