From deb7ffac0f3d8af59fddae0c9d08a3b0654206d1 Mon Sep 17 00:00:00 2001
From: Piotr Krysik <perper@o2.pl>
Date: Wed, 8 Apr 2009 16:35:59 +0200
Subject: Added FCCH search function from tvoid

---
 src/lib/gsm_receiver_cf.cc | 49 ++++++++++++++++++++++++++++++++++++++++++----
 src/lib/gsm_receiver_cf.h  | 28 ++++++++++++++------------
 2 files changed, 60 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/lib/gsm_receiver_cf.cc b/src/lib/gsm_receiver_cf.cc
index 821c929..e478c66 100644
--- a/src/lib/gsm_receiver_cf.cc
+++ b/src/lib/gsm_receiver_cf.cc
@@ -68,11 +68,52 @@ gsm_receiver_cf::general_work (int noutput_items,
     out[i] = in[i] * in[i];
   }
 
-  // Tell runtime system how many input items we consumed on
-  // each input stream.
-
   consume_each (noutput_items);
 
-  // Tell runtime system how many output items we produced.
   return noutput_items;
 }
+
+
+bool gsm_receiver_cf::get_fcch_burst()
+{
+  int hit_count = 0;
+  int miss_count = 0;
+  int start_pos = -1;
+/*
+  for ( int i=0; i < BBUF_SIZE; i++ ) {
+      if ( d_burst_buffer[i] > 0 ) {
+          if ( ! hit_count++ )
+            start_pos = i;
+        } else {
+          if ( hit_count >= FCCH_HITS_NEEDED ) {
+              break;
+            } else
+            if ( ++miss_count > FCCH_MAX_MISSES ) {
+                start_pos = -1;
+                hit_count = miss_count = 0;
+              }
+        }
+    }
+
+  //Do we have a match?
+  if ( start_pos >= 0 ) {
+      //Is it within range? (we know it's long enough then too)
+      if ( start_pos < 2*MAX_CORR_DIST ) {
+          d_burst_start = start_pos;
+          d_bbuf_pos = 0; //load buffer from start
+          return FCCH;
+
+        } else {
+          //TODO: don't shift a tiny amount
+          shift_burst( start_pos - MAX_CORR_DIST );
+        }
+    } else {
+      //Didn't find anything
+      d_burst_start = MAX_CORR_DIST;
+      d_bbuf_pos = 0; //load buffer from start
+    }
+
+  return UNKNOWN;
+*/
+}
+
diff --git a/src/lib/gsm_receiver_cf.h b/src/lib/gsm_receiver_cf.h
index 3b4ffc6..7067fb2 100644
--- a/src/lib/gsm_receiver_cf.h
+++ b/src/lib/gsm_receiver_cf.h
@@ -47,28 +47,30 @@ typedef boost::shared_ptr<gsm_receiver_cf> gsm_receiver_cf_sptr;
  * constructor is private.  howto_make_square_ff is the public
  * interface for creating new instances.
  */
-gsm_receiver_cf_sptr gsm_make_receiver_cf ();
+gsm_receiver_cf_sptr gsm_make_receiver_cf();
 
 /*!
- * \brief square a stream of floats.
+ * \brief Receives fcch
  * \ingroup block
- *
- * \sa howto_square2_ff for a version that subclasses gr_sync_block.
+ * \sa 
  */
+
 class gsm_receiver_cf : public gr_block
 {
-private:
-  friend gsm_receiver_cf_sptr gsm_make_receiver_cf ();
 
-  gsm_receiver_cf (); 
+  private:
+    friend gsm_receiver_cf_sptr gsm_make_receiver_cf();
+
+    gsm_receiver_cf();
+    bool get_fcch_burst();
 
- public:
-  ~gsm_receiver_cf ();
+  public:
+    ~gsm_receiver_cf();
 
-  int general_work (int noutput_items,
-		    gr_vector_int &ninput_items,
-		    gr_vector_const_void_star &input_items,
-		    gr_vector_void_star &output_items);
+    int general_work( int noutput_items,
+                      gr_vector_int &ninput_items,
+                      gr_vector_const_void_star &input_items,
+                      gr_vector_void_star &output_items );
 };
 
 #endif /* INCLUDED_GSM_RECEIVER_CF_H */
-- 
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