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#!/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
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