Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / filter / qa_gr_rotator.cc

diff --git a/gnuradio-core/src/lib/filter/qa_gr_rotator.cc b/gnuradio-core/src/lib/filter/qa_gr_rotator.cc
new file mode 100644 (file)
index 0000000..ce71a3d
--- /dev/null
+++ b/gnuradio-core/src/lib/filter/qa_gr_rotator.cc
@@ -0,0 +1,70 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 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.
+ */
+
+#include <cppunit/TestAssert.h>
+#include <qa_gr_rotator.h>
+#include <gr_rotator.h>
+#include <stdio.h>
+#include <cmath>
+#include <gr_expj.h>
+
+
+// error vector magnitude
+__attribute__((unused)) static float
+error_vector_mag(gr_complex a, gr_complex b) 
+{
+  return abs(a-b);
+}
+
+void
+qa_gr_rotator::t1 ()
+{
+  static const unsigned        int N = 100000;
+
+  gr_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;
+  }
+}