Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-examples / python / digital-bert / transmit_path.py

diff --git a/gnuradio-examples/python/digital-bert/transmit_path.py b/gnuradio-examples/python/digital-bert/transmit_path.py
new file mode 100644 (file)
index 0000000..96834b3
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+++ b/gnuradio-examples/python/digital-bert/transmit_path.py
@@ -0,0 +1,61 @@
+#
+# Copyright 2008 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.
+#
+
+from gnuradio import gr
+from math import pi, log10
+import cmath
+
+class transmit_path(gr.hier_block2):
+    """
+    This transmits a BERT sequence of bits using filtered BPSK and
+    outputs the complex baseband waveform.
+    """
+    def __init__(self,
+                 sps,          # Samples per symbol
+                 excess_bw,    # RRC filter excess bandwidth (typically 0.35-0.5)
+                 amplitude     # DAC output level, 0-32767, typically 2000-8000
+                 ):
+
+        gr.hier_block2.__init__(self, "transmit_path",
+                                gr.io_signature(0, 0, 0),                    # Input signature
+                                gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+
+        # Create BERT data bit stream  
+       self._bits = gr.vector_source_b([1,], True)      # Infinite stream of ones
+        self._scrambler = gr.scrambler_bb(0x8A, 0x7F, 7) # CCSDS 7-bit scrambler
+
+       # Map to constellation
+       self._constellation = [-1+0j, 1+0j]
+       self._mapper = gr.chunks_to_symbols_bc(self._constellation)     
+
+       # Create RRC with specified excess bandwidth
+       taps = gr.firdes.root_raised_cosine(sps*amplitude,  # Gain
+                                           sps,            # Sampling rate
+                                           1.0,            # Symbol rate
+                                           excess_bw,      # Roll-off factor
+                                           11*sps)         # Number of taps
+
+       self._rrc = gr.interp_fir_filter_ccf(sps,           # Interpolation rate
+                                            taps)          # FIR taps
+
+        # Wire block inputs and outputs
+        self.connect(self._bits, self._scrambler, self._mapper, self._rrc, self)
+