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| author | trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5> | 2007-06-10 18:16:11 +0000 |
|---|---|---|
| committer | trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5> | 2007-06-10 18:16:11 +0000 |
| commit | a663f5b481679d8a352c668825cee92f548f3fcc (patch) | |
| tree | 9286d4480cd964413b6e87aa6656d9e90e43ab13 /gnuradio-examples/python/ofdm/plot_ofdm.m | |
| parent | 616296d9e9e091360101f7f68b0c03ec1a6e382d (diff) | |
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
Diffstat (limited to 'gnuradio-examples/python/ofdm/plot_ofdm.m')
| -rwxr-xr-x | gnuradio-examples/python/ofdm/plot_ofdm.m | 65 |
1 files changed, 65 insertions, 0 deletions
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 |