#!/usr/bin/env python # # Copyright 2007 Free Software Foundation, Inc. # # This file is part of GNU Radio # # GNU Radio is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3, or (at your option) # any later version. # # GNU Radio is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with GNU Radio; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 51 Franklin Street, # Boston, MA 02110-1301, USA. # import math, struct, sys from optparse import OptionParser from math import log10 try: import scipy from scipy import fftpack except ImportError: print "Error: Program requires scipy (see: www.scipy.org)." sys.exit(1) try: from pylab import * from matplotlib.font_manager import fontManager, FontProperties except ImportError: print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)." sys.exit(1) matplotlib.interactive(True) matplotlib.use('TkAgg') class draw_constellation: def __init__(self, options): derot_file = "ofdm_frame_sink_c.dat" acq_file = "ofdm_frame_acq_c.dat" fft_file = "ofdm_receiver-fft_out_c.dat" self.h_derot_file = open(derot_file, "r") self.h_acq_file = open(acq_file, "r") self.h_fft_file = open(fft_file, "r") self.occ_tones = options.occ_tones self.fft_size = options.fft_size self.symbol = options.start self.sample_rate = options.sample_rate self.axis_font_size = 16 self.label_font_size = 18 self.title_font_size = 20 self.text_size = 22 # Setup PLOT self.fig = figure(1, figsize=(14, 9), facecolor='w') rcParams['xtick.labelsize'] = self.axis_font_size rcParams['ytick.labelsize'] = self.axis_font_size self.text_sym = figtext(0.05, 0.95, ("Symbol: %s" % self.symbol), weight="heavy", size=self.text_size) self.make_plots() self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True) self.button_left = Button(self.button_left_axes, "<") self.button_left_callback = self.button_left.on_clicked(self.button_left_click) self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True) self.button_right = Button(self.button_right_axes, ">") self.button_right_callback = self.button_right.on_clicked(self.button_right_click) self.xlim = self.sp_eq.get_xlim() self.manager = get_current_fig_manager() #connect('draw_event', self.zoom) connect('key_press_event', self.click) show() def get_data(self): self.text_sym.set_text("Symbol: %d" % (self.symbol)) derot_data = scipy.fromfile(self.h_derot_file, dtype=scipy.complex64, count=self.occ_tones) acq_data = scipy.fromfile(self.h_acq_file, dtype=scipy.complex64, count=self.occ_tones) fft_data = scipy.fromfile(self.h_fft_file, dtype=scipy.complex64, count=self.fft_size) if(len(acq_data) == 0): print "End of File" else: self.acq_data_reals = [r.real for r in acq_data] self.acq_data_imags = [i.imag for i in acq_data] self.derot_data_reals = [r.real for r in derot_data] self.derot_data_imags = [i.imag for i in derot_data] self.unequalized_angle = [math.atan2(x.imag, x.real) for x in fft_data] self.equalized_angle = [math.atan2(x.imag, x.real) for x in acq_data] self.derot_equalized_angle = [math.atan2(x.imag, x.real) for x in derot_data] self.time = [i*(1/self.sample_rate) for i in range(len(acq_data))] ffttime = [i*(1/self.sample_rate) for i in range(len(fft_data))] self.freq = self.get_freq(ffttime, self.sample_rate) for i in range(len(fft_data)): if(abs(fft_data[i]) == 0.0): fft_data[i] = complex(1e-6,1e-6) self.fft_data = [20*log10(abs(f)) for f in fft_data] def get_freq(self, time, sample_rate, T=1): N = len(time) Fs = 1.0 / (max(time) - min(time)) Fn = 0.5 * sample_rate freq = [-Fn + i*Fs for i in range(N)] return freq def make_plots(self): self.h_acq_file.seek(8*self.symbol*self.occ_tones, 0) self.h_fft_file.seek(8*self.symbol*self.fft_size, 0) self.h_derot_file.seek(8*self.symbol*self.occ_tones, 0) self.get_data() # Subplot: constellation of rotated symbols self.sp_const = self.fig.add_subplot(4,1,1, position=[0.15, 0.55, 0.3, 0.35]) self.sp_const.set_title(("Constellation"), fontsize=self.title_font_size, fontweight="bold") self.sp_const.set_xlabel("Inphase", fontsize=self.label_font_size, fontweight="bold") self.sp_const.set_ylabel("Qaudrature", fontsize=self.label_font_size, fontweight="bold") self.plot_const = plot(self.acq_data_reals, self.acq_data_imags, 'bo') self.plot_const += plot(self.derot_data_reals, self.derot_data_imags, 'ro') self.sp_const.axis([-2, 2, -2, 2]) # Subplot: unequalized angle self.sp_uneq = self.fig.add_subplot(4,2,1, position=[0.575, 0.55, 0.3, 0.35]) self.sp_uneq.set_title(("Unequalized Angle"), fontsize=self.title_font_size, fontweight="bold") self.sp_uneq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold") self.sp_uneq.set_ylabel("Angle", fontsize=self.label_font_size, fontweight="bold") uneqscale = range(len(self.unequalized_angle)) self.plot_uneq = plot(uneqscale, self.unequalized_angle, 'bo') # Subplot: equalized angle self.sp_eq = self.fig.add_subplot(4,1,2, position=[0.15, 0.1, 0.3, 0.35]) self.sp_eq.set_title(("Equalized Angle"), fontsize=self.title_font_size, fontweight="bold") self.sp_eq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold") self.sp_eq.set_ylabel("Angle", fontsize=self.label_font_size, fontweight="bold") eqscale = range(len(self.equalized_angle)) self.plot_eq = plot(eqscale, self.equalized_angle, 'bo') self.plot_eq += plot(eqscale, self.derot_equalized_angle, 'ro', markersize=4) # Subplot: FFT self.sp_fft = self.fig.add_subplot(4,2,2, position=[0.575, 0.1, 0.3, 0.35]) self.sp_fft.set_title(("FFT"), fontsize=self.title_font_size, fontweight="bold") self.sp_fft.set_xlabel("Frequency (MHz)", fontsize=self.label_font_size, fontweight="bold") self.sp_fft.set_ylabel("Power (dBm)", fontsize=self.label_font_size, fontweight="bold") self.plot_fft = plot(self.freq, self.fft_data, '-bo') draw() def update_plots(self): eqscale = range(len(self.equalized_angle)) uneqscale = range(len(self.unequalized_angle)) self.plot_eq[0].set_data([eqscale, self.equalized_angle]) self.plot_eq[1].set_data([eqscale, self.derot_equalized_angle]) self.plot_uneq[0].set_data([uneqscale, self.unequalized_angle]) self.sp_eq.set_ylim([-4, 4]) self.sp_uneq.set_ylim([-4, 4]) #self.sp_iq.axis([min(self.time), max(self.time), # 1.5*min([min(self.acq_data_reals), min(self.acq_data_imags)]), # 1.5*max([max(self.acq_data_reals), max(self.acq_data_imags)])]) self.plot_const[0].set_data([self.acq_data_reals, self.acq_data_imags]) self.plot_const[1].set_data([self.derot_data_reals, self.derot_data_imags]) self.sp_const.axis([-2, 2, -2, 2]) self.plot_fft[0].set_data([self.freq, self.fft_data]) draw() def zoom(self, event): newxlim = self.sp_eq.get_xlim() if(newxlim != self.xlim): self.xlim = newxlim r = self.reals[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))] i = self.imags[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))] self.plot_const[0].set_data(r, i) self.sp_const.axis([-2, 2, -2, 2]) self.manager.canvas.draw() draw() def click(self, event): forward_valid_keys = [" ", "down", "right"] backward_valid_keys = ["up", "left"] if(find(event.key, forward_valid_keys)): self.step_forward() elif(find(event.key, backward_valid_keys)): self.step_backward() def button_left_click(self, event): self.step_backward() def button_right_click(self, event): self.step_forward() def step_forward(self): self.symbol += 1 self.get_data() self.update_plots() def step_backward(self): # Step back in file position self.symbol -= 1 if(self.h_acq_file.tell() >= 16*self.occ_tones): self.h_acq_file.seek(-16*self.occ_tones, 1) else: self.symbol = 0 self.h_acq_file.seek(-self.h_acq_file.tell(),1) if(self.h_derot_file.tell() >= 16*self.occ_tones): self.h_derot_file.seek(-16*self.occ_tones, 1) else: self.symbol = 0 self.h_derot_file.seek(-self.h_derot_file.tell(),1) if(self.h_fft_file.tell() >= 16*self.fft_size): self.h_fft_file.seek(-16*self.fft_size, 1) else: self.symbol = 0 self.h_fft_file.seek(-self.h_fft_file.tell(),1) self.get_data() self.update_plots() #FIXME: there must be a way to do this with a Python builtin def find(item_in, list_search): for l in list_search: if item_in == l: return True return False def main(): usage="%prog: [options]" parser = OptionParser(conflict_handler="resolve", usage=usage) parser.add_option("", "--fft-size", type="int", default=512, help="Specify the size of the FFT [default=%default]") parser.add_option("", "--occ-tones", type="int", default=200, help="Specify the number of occupied tones [default=%default]") parser.add_option("-s", "--start", type="int", default=0, help="Specify the starting symbol to plot [default=%default]") parser.add_option("-R", "--sample-rate", type="float", default=1.0, help="Set the sampler rate of the data [default=%default]") (options, args) = parser.parse_args () dc = draw_constellation(options) if __name__ == "__main__": try: main() except KeyboardInterrupt: pass