1 files changed, 53 insertions, 0 deletions
diff --git a/gnuradio-examples/python/limbo/sounder/sounder_rx.py b/gnuradio-examples/python/limbo/sounder/sounder_rx.py
new file mode 100644
index 000000000..d24eb8efa
--- /dev/null
+++ b/gnuradio-examples/python/limbo/sounder/sounder_rx.py
@@ -0,0 +1,53 @@
+#!/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.
+# 
+
+from gnuradio import gr, usrp, eng_notation
+from usrp_source import usrp_source_c
+import math
+
+n2s = eng_notation.num_to_str
+
+class sounder_rx(gr.hier_block2):
+    """
+    Creates a channel sounder receiver block with the given parameters.
+    """
+
+    def __init__(self, chip_rate, degree, verbose):
+
+        # Call hierarchical block constructor
+        # Top-level blocks have no inputs or outputs
+        gr.hier_block2.__init__(self,
+                                "sounder_rx",                                # Block typename
+                                gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+                                gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+
+        self._degree = degree
+        self._chip_rate = chip_rate
+        self._verbose = verbose
+        self._length = 2**self._degree-1
+        self._rep_rate = self._chip_rate/float(self._length)
+
+        if self._verbose:
+            print "Using PN sequence of degree", self._degree, "length", self._length
+            print "Sequence repetition rate is", n2s(self._rep_rate), "per sec"
+        
+        self.connect(self, gr.pn_correlator_cc(self._degree), self)