From a663f5b481679d8a352c668825cee92f548f3fcc Mon Sep 17 00:00:00 2001
From: trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Sun, 10 Jun 2007 18:16:11 +0000
Subject: Merging OFDM features branch r5661:5759 into trunk. OFDM works over
the air with BPSK and QPSK modulations on subcarriers. Passes make distcheck.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5761 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/ofdm/plot_ofdm.m | 65 +++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
create mode 100755 gnuradio-examples/python/ofdm/plot_ofdm.m
(limited to 'gnuradio-examples/python/ofdm/plot_ofdm.m')
diff --git a/gnuradio-examples/python/ofdm/plot_ofdm.m b/gnuradio-examples/python/ofdm/plot_ofdm.m
new file mode 100755
index 0000000000..87eae3a116
--- /dev/null
+++ b/gnuradio-examples/python/ofdm/plot_ofdm.m
@@ -0,0 +1,65 @@
+function plot_ofdm(fft_size, occ_tones)
+
+ofdm = read_complex_binary('ofdm_corr_out_c.dat');
+ofdm_split = split_vect(ofdm, occ_tones);
+
+fftc = read_complex_binary('fft_out_c.dat');
+fftc_split = split_vect(fftc, fft_size);
+
+figure(1)
+set(gcf, 'Position', [50 50 1000 600]);
+
+a = size(ofdm_split);
+if nargin == 3
+ maxcount = count;
+ if maxcount > a(1)
+ error('plot_ofdm:tolong', 'Requested count size exceeds size of vectors');
+ end
+else
+ maxcount = a(1);
+end
+
+for i = 1:20000
+ x = ofdm_split(i,:);
+ y = fftc_split(i+1,:);
+
+ subplot(2,2,1)
+ plot(real(x), imag(x), 'bo')
+ set(gca, 'FontSize', 30, 'FontWeight', 'Bold');
+ axis([-1.5, 1.5, -1.5, 1.5])
+ title('I&Q Constellation', 'FontSize', 36);
+ xlabel('Inphase', 'FontSize', 32);
+ ylabel('Quadrature', 'FontSize', 32);
+
+ subplot(2,2,3)
+ plot(angle(x*j), 'bo')
+ set(gca, 'FontSize', 30, 'FontWeight', 'Bold');
+ axis([0, occ_tones, -3.5, 3.5])
+ title('Equalized Symbol Angle', 'FontSize', 36);
+ xlabel('Bin Number (Occ. Tones)', 'FontSize', 32);
+ ylabel('Symbol Angle', 'FontSize', 32);
+
+ subplot(2,2,2)
+ plot(angle(y*j), 'bo')
+ set(gca, 'FontSize', 30, 'FontWeight', 'Bold');
+ axis([0, fft_size, -3.5, 3.5])
+ title('Unequalized Symbol Angle', 'FontSize', 36);
+ xlabel('Bin Number (FFT Size)', 'FontSize', 32);
+ ylabel('Symbol Angle', 'FontSize', 32);
+
+ Y = 20*log10(abs(y) ./ max(abs(y)));
+ subplot(2,2,4)
+ plot(Y, 'b-')
+ set(gca, 'FontSize', 30, 'FontWeight', 'Bold');
+ axis([0, fft_size, -50, 1]);
+ title('Frequency Domain of Unequalized Rx', 'FontSize', 36);
+ xlabel('Bin Number (FFT Size)', 'FontSize', 32);
+ ylabel('Power (dB)', 'FontSize', 32);
+
+ % N = 20*log10(var(abs(x)-1))
+
+ disp(sprintf('Symbol Number: %d\n', i))
+% disp(sprintf('\tFreq Error: %f\n', anglesh_pn(1+(i-1)*fft_size)))
+ pause
+
+end
--
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