digital: moved narrowband examples to their own directory (to make room for OFDM examples).

1 files changed, 278 insertions, 0 deletions

diff --git a/gr-digital/examples/ofdm/gr_plot_ofdm.py b/gr-digital/examples/ofdm/gr_plot_ofdm.py
new file mode 100755
index 000000000..b24855148
--- /dev/null
+++ b/gr-digital/examples/ofdm/gr_plot_ofdm.py
@@ -0,0 +1,278 @@
+#!/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
+    
+
+