Changeset 3790

Timestamp:

05/12/07 14:24:40 (6 years ago)

Author:

jgaeddert

Message:

adding new test to SymbolSyncPoly DSP; method to change loop filter bandwidth

Location:

experimental/components/SymbolSyncPoly

Files:

• autotest_sources/SymbolSyncPoly_testsuite.h (modified) (5 diffs)
• autotest_sources/test_02.h (modified) (1 diff)
• autotest_sources/test_03.h (added)
• src/SymbolSyncPolyDSP.h (modified) (1 diff)

experimental/components/SymbolSyncPoly/autotest_sources/SymbolSyncPoly_testsuite.h

@@ -10 +10 @@
 
 #include "test_02.h"
+#include "test_03.h"
 
 //
 // A simple test suite: Just inherit CxxTest::TestSuite and write tests!
 //
+
+unsigned int CountSymbolErrors( short * msg_in_i,
+        short * msg_in_q,
+        short * msg_out_i,
+        short * msg_out_q,
+        short tol,
+        unsigned int N)
+{
+    unsigned int num_errors(0);
+    for (unsigned int i=0; i<N; i++) {
+        if ( abs(msg_in_i[i]-msg_out_i[i]) > tol && abs(msg_in_q[i]-msg_out_q[i]) > tol )
+            num_errors++;
+    }
+    return num_errors;
+}
+
 
 // NOTE: " : public CxxTest::TestSuite" must be on the same line as the class
@@ -160 +177 @@
     }
 
-
     // test_02
-    void testSymbolSynchronizationTimingOffset()
+    void testSymbolSynchronizationTimingOffset_02()
     {
-        std::cout << std::endl << "testSymbolSynchronizationTimingOffset" << std::endl;
+        std::cout << std::endl << "testSymbolSynchronizationTimingOffset_02" << std::endl;
         SymbolSyncPolyDSP symbolSync;
 
         // Init variables shall match the values used in MATLAB to get the test vectors and
         // expected result
-        unsigned int Npfb_02 = 32;
         unsigned int N_out_02 = N_in_02;
 
@@ -179 +194 @@
 
         symbolSync.ConfigureFilterBank(type_02, k_02, m_02, beta_02, Npfb_02);
+        symbolSync.UpdateTimingLoopFilterCoefficients(alpha_s_02, beta_s_02);
 
         //send test data
@@ -202 +218 @@
         std::cout << "num_correct_symbols : " << num_correct_symbols << std::endl;
 
-        TS_ASSERT(num_correct_symbols > 150);
+        TS_ASSERT(num_correct_symbols > 200);
 
         delete [] I_out_02;
@@ -208 +224 @@
     }
 
+
+    // test_03
+    void testSymbolSynchronizationTimingOffset_03()
+    {
+        std::cout << std::endl << "testSymbolSynchronizationTimingOffset_03" << std::endl;
+        SymbolSyncPolyDSP symbolSync;
+
+        // Init variables shall match the values used in MATLAB to get the test vectors and
+        // expected result
+        unsigned int N_out_03 = N_in_03;
+
+        //Need some buffer for mismatched samples per symbol
+        short* I_out_03 = new short[N_out_03];
+        short* Q_out_03 = new short[N_out_03];
+        memset( I_out_03, 0, N_out_03*sizeof(short) );
+        memset( Q_out_03, 0, N_out_03*sizeof(short) );
+
+        symbolSync.ConfigureFilterBank(type_03, k_03, m_03, beta_03, Npfb_03);
+        symbolSync.UpdateTimingLoopFilterCoefficients(alpha_s_03, beta_s_03);
+
+        //send test data
+        symbolSync.SynchronizeAndDecimate(
+            I_in_03,
+            Q_in_03,
+            N_in_03,
+            I_out_03,
+            Q_out_03,
+            N_out_03);
+
+        // hard decision to see if we recovered the message correctly
+        unsigned int num_errors_2_percent;
+        num_errors_2_percent =
+            CountSymbolErrors(I_out_03+m_03-1, Q_out_03+m_03-1, msg_i_03, msg_q_03, Ac_03/50, N_out_03-m_03);
+        std::cout << "  num errors outside 2% tolerance = " << num_errors_2_percent << std::endl;
+        TS_ASSERT(num_errors_2_percent < 50);
+        
+        unsigned int num_errors_5_percent;
+        num_errors_5_percent =
+            CountSymbolErrors(I_out_03+m_03-1, Q_out_03+m_03-1, msg_i_03, msg_q_03, Ac_03/20, N_out_03-m_03);
+        std::cout << "  num errors outside 5% tolerance = " << num_errors_5_percent << std::endl;
+        TS_ASSERT(num_errors_5_percent < 20);
+
+        delete [] I_out_03;
+        delete [] Q_out_03;
+    }
+
 };
 

experimental/components/SymbolSyncPoly/autotest_sources/test_02.h

@@ -14 +14 @@
 unsigned int m_02 = 4;          // Symbol delay
 float beta_02 = 0.25;           // Excess bandwidth factor
+unsigned int Npfb_02 = 32;      // Number of filters in filter bank
+
 short Ac_02 = 10000;            // Signal amplitude
+
+float alpha_s_02 = 0.05f;       // Loop control feedback coefficient
+float beta_s_02 = 1.025f;       // Loop control feedforware coefficient
 
 short I_in_02[512] = {

experimental/components/SymbolSyncPoly/src/SymbolSyncPolyDSP.h

@@ -61 +61 @@
             float _beta,
             unsigned int _Npfb);
+
+    ///
+    ///\todo change to : void UpdateTimingLoopFilterCoefficients(float _BT);
+    void UpdateTimingLoopFilterCoefficients(float _alpha, float _beta) {
+        alpha = _alpha;
+        beta = _beta;
+    }
 
     /// Estimate timing information