File: rtl_sdr_dab_rx_constellation.py

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#!/usr/bin/env python
# _*_ coding: utf8 _*_

# Andreas Müller, 2008
# andrmuel@ee.ethz.ch
#
# this code may be freely used under GNU GPL conditions

"""
demodulate DAB signal and ouput to constellation sink
"""

from gnuradio import gr, blocks
import osmosdr
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import stdgui2, fftsink2, scopesink2
import grdab
from optparse import OptionParser
import wx
import sys, threading, time

class usrp_dab_gui_rx(stdgui2.std_top_block):
	def __init__(self, frame, panel, vbox, argv):
		stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)

		self.frame = frame
		self.panel = panel

		parser = OptionParser(option_class=eng_option, usage="%prog: [options] <filename>")
  		parser.add_option("-m", "--dab-mode", type="int", default=1,
        	     	help="DAB mode [default=%default]")
		parser.add_option("-F", "--filter-input", action="store_true", default=False,
                          help="Enable FFT filter at input")
		parser.add_option('-c', '--correct-ffe', action="store_true", default=False,
		     help="do fine frequency correction")
		parser.add_option('-u', '--correct-ffe-usrp', action="store_true", default=False,
		     help="do fine frequency correction by retuning the USRP instead of in software")
		parser.add_option('-e', '--equalize-magnitude', action="store_true", default=False,
		     help="do magnitude equalization")
  		parser.add_option("-s", "--resample-fixed", type="eng_float", default=1,
			help="resample by a fixed factor (fractional interpolation)")
		parser.add_option("-S", "--autocorrect-sample-rate", action="store_true", default=False,
                          help="Estimate sample rate offset and resample (dynamic fractional interpolation)")
		parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0, 0),
		     help="select USRP Rx side A or B [default=A]")
		parser.add_option("-f", "--freq", type="eng_float", default=227.36e6,
		     help="set frequency to FREQ [default=%default]")
		parser.add_option("-p", "--ppm", type="int", default=0,
		     help="set frequency correction in ppm [default=%default]")
		parser.add_option("-r", "--sample-rate", type="int", default=2000000,
		     help="set sample rate to SAMPLE_RATE [default=%default]")
		parser.add_option("-d", "--decim", type="intx", default=32,
		     help="set decimation rate to DECIM [default=%default]")
		parser.add_option("-g", "--rx-gain", type="eng_float", default=None,
		     help="set receive gain in dB (default is midpoint)")
		parser.add_option('-v', '--verbose', action="store_true", default=False,
		     help="verbose output")
		(options, args) = parser.parse_args()

		
		self.verbose = options.verbose
                self.sample_rate = options.sample_rate

		if len(args) == 0:
			if self.verbose:
				print "--> receiving from RTL-SDR"
			self.src = osmosdr.source()
			self.src.set_sample_rate(self.sample_rate)
			self.src.set_freq_corr(options.ppm)
			# tune frequency
			self.frequency = options.freq
			self.set_freq(options.freq)

			# set gain      
                        if options.rx_gain is None:
                                # if no gain was specified, use AGC
                                self.src.set_gain_mode(True, 0)
                        else:
                                self.src.set_gain(options.rx_gain, 0)

		else:
			if self.verbose:
				print "--> receiving from file: " + args[0]
			self.filename = args[0]
			self.src = blocks.file_source(gr.sizeof_gr_complex, self.filename, False)
		
		
		self.dab_params = grdab.parameters.dab_parameters(mode=options.dab_mode, sample_rate=self.sample_rate, verbose=options.verbose)
		self.rx_params = grdab.parameters.receiver_parameters(mode=options.dab_mode, softbits=True, input_fft_filter=options.filter_input, autocorrect_sample_rate=options.autocorrect_sample_rate, sample_rate_correction_factor=options.resample_fixed, verbose=options.verbose, correct_ffe=options.correct_ffe, equalize_magnitude=options.equalize_magnitude)
	
		
		self.demod = grdab.ofdm_demod(self.dab_params, self.rx_params, verbose=self.verbose) 

		self.v2s = blocks.vector_to_stream(gr.sizeof_gr_complex, self.dab_params.num_carriers)
		self.scope = scopesink2.scope_sink_c(self.panel, title="DAB constellation sink", sample_rate=self.dab_params.sample_rate, xy_mode=True)

		self.sink = blocks.null_sink(gr.sizeof_float*self.dab_params.num_carriers*2)

		self.connect(self.src, self.demod, self.sink)
        
		# build GUI
		self.connect(self.demod.deinterleave, self.v2s, self.scope)
		vbox.Add(self.scope.win, 10, wx.EXPAND)

                # FFT Sink
		self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(
			self.panel,
			baseband_freq=0,
			y_per_div=10,
			y_divs=10,
			ref_level=0,
			ref_scale=2.0,
			sample_rate=self.sample_rate,
			fft_size=1024,
			fft_rate=15,
			average=False,
			avg_alpha=None,
			title="FFT Plot",
			peak_hold=False,
		)
		vbox.Add(self.wxgui_fftsink2_0.win)
		self.connect((self.src, 0), (self.wxgui_fftsink2_0, 0))
		
		# retune USRP to correct FFE?
		self.correct_ffe_usrp = options.correct_ffe_usrp
		if self.correct_ffe_usrp:
			print "--> correcting FFE on USRP"
			self.run_correct_ffe_thread = True
			self.ffe_updater = threading.Timer(0.1, self.correct_ffe)
			self.ffe_updater.setDaemon(True)
			self.ffe_updater.start()

	def correct_ffe(self):
		while self.run_correct_ffe_thread:
			diff = self.demod.sync.ffs_sample_and_average_arg.ffe_estimate()
			if abs(diff) > self.rx_params.usrp_ffc_min_deviation:
				self.frequency -= diff*self.rx_params.usrp_ffc_adapt_factor
				print "--> updating fine frequency correction: " + str(self.frequency)
				self.set_freq(self.frequency)
			time.sleep(1./self.rx_params.usrp_ffc_retune_frequency)


	def set_freq(self, freq):
		if self.src.set_center_freq(freq, 0):
			if self.verbose:
				print "--> retuned to " + str(freq) + " Hz"
			return True
		else:
			print "-> error - cannot tune to " + str(freq) + " Hz"
			return False


if __name__ == '__main__':
	app = stdgui2.stdapp(usrp_dab_gui_rx, "usrp_dab_gui_rx", nstatus=1)
	app.MainLoop()