analog: adding rotator to gr-analog with QA.

4 files changed, 129 insertions, 0 deletions

diff --git a/gr-analog/lib/CMakeLists.txt b/gr-analog/lib/CMakeLists.txt
index e0e621d13..c93c220cc 100644
--- a/gr-analog/lib/CMakeLists.txt
+++ b/gr-analog/lib/CMakeLists.txt
@@ -153,6 +153,7 @@ if(ENABLE_TESTING)
     ${CMAKE_CURRENT_SOURCE_DIR}/test_gr_analog.cc
     ${CMAKE_CURRENT_SOURCE_DIR}/qa_analog.cc
     ${CMAKE_CURRENT_SOURCE_DIR}/qa_sincos.cc
+    ${CMAKE_CURRENT_SOURCE_DIR}/qa_rotator.cc
     )
 
   add_executable(test-gr-analog ${test_gr_analog_sources})
diff --git a/gr-analog/lib/qa_analog.cc b/gr-analog/lib/qa_analog.cc
index ceecb096d..c3d51863b 100644
--- a/gr-analog/lib/qa_analog.cc
+++ b/gr-analog/lib/qa_analog.cc
@@ -27,6 +27,7 @@
 
 #include <qa_analog.h>
 #include <qa_sincos.h>
+#include <qa_rotator.h>
 
 CppUnit::TestSuite *
 qa_gr_analog::suite()
@@ -34,6 +35,7 @@ qa_gr_analog::suite()
   CppUnit::TestSuite *s = new CppUnit::TestSuite("gr-analog");
 
   s->addTest(gr::analog::qa_sincos::suite());
+  s->addTest(gr::analog::qa_rotator::suite());
 
   return s;
 }
diff --git a/gr-analog/lib/qa_rotator.cc b/gr-analog/lib/qa_rotator.cc
new file mode 100644
index 000000000..b722f32c4
--- /dev/null
+++ b/gr-analog/lib/qa_rotator.cc
@@ -0,0 +1,81 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002,2012 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gruel/attributes.h>
+#include <cppunit/TestAssert.h>
+#include <qa_rotator.h>
+#include <analog/rotator.h>
+#include <stdio.h>
+#include <cmath>
+#include <gr_expj.h>
+
+namespace gr {
+  namespace analog {
+
+    // error vector magnitude
+    __GR_ATTR_UNUSED static float
+    error_vector_mag(gr_complex a, gr_complex b)
+    {
+      return abs(a-b);
+    }
+
+    void
+    qa_rotator::t1()
+    {
+      static const unsigned int N = 100000;
+
+      rotator r;
+
+      double phase_incr = 2*M_PI / 1003;
+      double phase = 0;
+
+      // Old code: We increment then return the rotated value, thus we
+      // need to start one tick back
+      // r.set_phase(gr_complex(1,0) * conj(gr_expj(phase_incr)));
+
+      r.set_phase(gr_complex(1,0));
+      r.set_phase_incr(gr_expj(phase_incr));
+
+      for(unsigned i = 0; i < N; i++) {
+	gr_complex expected = gr_expj(phase);
+	gr_complex actual = r.rotate(gr_complex(1, 0));
+
+#if 0
+	float evm = error_vector_mag(expected, actual);
+	printf("[%6d] expected: (%8.6f, %8.6f)  actual: (%8.6f, %8.6f)  evm: %8.6f\n",
+	       i, expected.real(), expected.imag(), actual.real(), actual.imag(), evm);
+#endif
+
+	CPPUNIT_ASSERT_COMPLEXES_EQUAL(expected, actual, 0.0001);
+
+	phase += phase_incr;
+	if(phase >= 2*M_PI)
+	  phase -= 2*M_PI;
+      }
+    }
+
+  } /* namespace analog */
+} /* namespace gr */
diff --git a/gr-analog/lib/qa_rotator.h b/gr-analog/lib/qa_rotator.h
new file mode 100644
index 000000000..a22e41ec2
--- /dev/null
+++ b/gr-analog/lib/qa_rotator.h
@@ -0,0 +1,45 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2012 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.
+ */
+
+#ifndef _QA_ANALOG_ROTATOR_H_
+#define _QA_ANALOG_ROTATOR_H_
+
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/TestCase.h>
+
+namespace gr {
+  namespace analog {
+
+    class qa_rotator : public CppUnit::TestCase
+    {
+      CPPUNIT_TEST_SUITE(qa_rotator);
+      CPPUNIT_TEST(t1);
+      CPPUNIT_TEST_SUITE_END();
+
+    private:
+      void t1();
+    };
+
+  } /* namespace analog */
+} /* namespace gr */
+
+#endif /* _QA_ANALOG_ROTATOR_H_ */