[Discuss-gnuradio] Can we really put whatever rx_cfile obtained into ofdm receiver?

[bin zan]

Hi,
     I am going to give more detail about my experiment in case some one could help me but didn't understand my situation. 
sender:
     step 1.a : ./benchmark_ofdm_tx.py -f 10M -i 512 --fft-length=32 --occupied-tones=16 --cp-length=4
receiver:
     step 1.b: ./usrp_rx_cfile.py -f 10M -d 256 ofdmdata.dat
offline at receiver:
     step 2: ./benchmark_ofdm_rx.py -f 10M -d 256 --fft-length=32 --occupied-tones=16 --cp-length=4 ( after some necessary change in ./benchmark_ofdm_rx.py for example self.u = gr.file_source(gr.sizeof_gr_complex, "data.dat", False))
    However, it looks doesn't work, since tried several times, but no packet ever received correctly.  
    Does anyone can give some suggestion? 

Thanks,
Bin
      
some change I made in benchmark_ofdm_rx.py file
       # Set up USRP source
        self._setup_usrp_source()
        #ok = self.set_freq(self._rx_freq)
        #if not ok:
        #    print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(self._rx_freq))
        #    raise ValueError, eng_notation.num_to_str(self._rx_freq)
        #g = self.subdev.gain_range()
        #if options.show_rx_gain_range:
        #    print "Rx Gain Range: minimum = %g, maximum = %g, step size = %g"          % (g[0], g[1], g[2])
        #self.set_gain(options.rx_gain)
        #self.set_auto_tr(True)                 # enable Auto Transmit/Receive switching

        # Set up receive path
        self.rxpath = receive_path(callback, options)

        self.connect(self.u, self.rxpath)
        
    def _setup_usrp_source(self):
        #self.u = usrp.source_c (fusb_block_size=self._fusb_block_size,
                                #fusb_nblocks=self._fusb_nblocks)
        #pdb.set_trace()
        self.u=gr.file_source(gr.sizeof_gr_complex,"ofdm.dat",False)     
        #adc_rate = self.u.adc_rate()
        adc_rate=64000000

        #self.u.set_decim_rate(self._decim)
        self._decim=256

        # determine the daughterboard subdevice we're using
        #if self._rx_subdev_spec is None:
        #    self._rx_subdev_spec = usrp.pick_rx_subdevice(self.u)
        #self.subdev = usrp.selected_subdev(self.u, self._rx_subdev_spec)

        #self.u.set_mux(usrp.determine_rx_mux_value(self.u, self._rx_subdev_spec))