1 files changed, 81 insertions, 0 deletions
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 */