Adding a constellation plot and an example for viewing constellations of digital modulations.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10537 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 40 insertions, 0 deletions

diff --git a/gr-qtgui/src/python/qt_digital.py b/gr-qtgui/src/python/qt_digital.py
new file mode 100755
index 000000000..f7635b4a5
--- /dev/null
+++ b/gr-qtgui/src/python/qt_digital.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+from gnuradio import gr, blks2
+from gnuradio.qtgui import qtgui
+import scipy
+
+class my_top_block(gr.top_block):
+    def __init__(self):
+        gr.top_block.__init__(self)
+
+        sps = 2
+        excess_bw = 0.35
+        gray_code = True
+        
+        fftsize = 2048
+
+        data = scipy.random.randint(0, 255, 1000)
+        src = gr.vector_source_b(data, True)
+        mod = blks2.dqpsk_mod(sps, excess_bw, gray_code, False, False)
+
+        rrctaps = gr.firdes.root_raised_cosine(1, sps, 1, excess_bw, 21)
+        rx_rrc = gr.fir_filter_ccf(sps, rrctaps)
+        
+        thr = gr.throttle(gr.sizeof_gr_complex, 10*fftsize)
+        self.snk_tx = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS, -1/2, 1/2)
+        self.snk_rx = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS, -1/2, 1/2)
+
+        self.connect(src, mod, self.snk_tx)
+        self.connect(mod, rx_rrc, thr, self.snk_rx)
+        
+        self.snk_tx.initialize()
+        qapp = self.snk_tx.get_qapplication()
+        self.snk_rx.initialize(qapp)
+
+if __name__ == "__main__":
+    tb = my_top_block();
+    tb.start()
+    tb.snk_tx.start_app();
+    #tb.wait();
+