test_midamble.c

This a framework to test new ideas in transmission technology. Actual development is a LDPC-coder in

/***************************************************************************
               midamble_test.c  -  SRadio testing of midamble
                            -------------------
    begin                :  2002
    authors              :  Linus Gasser
    emails               :  [e-mail]
 ***************************************************************************/

/***************************************************************************
                                 Changes
                                 -------
 date - name - description
 02-10-16 - ineiti - begin
 02-11-04 - ineiti - extension for notice_function
 04/03/03 - ineiti - added a small description
 
 **************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/


char desc[] =
"Description:\n"
"Make a small little chain with the midamble using the following chain:\n"
"midamble -> rrc -> block -> matched_filter\n"
"where the midamble and matched_filter are complementary, that is,\n"
"what the midamble inserts, the matched_filter should get out.\n"
"The rrc is a pulse-shape filter which uses a root-raised cosine with\n"
"alpha (roll-off factor) = 0.22 and it also does an upsampling by a\n"
"factor of four. block simulates a channel that is,\n"
"it scales a bit the signal.\n\n";


#include "system.h"
#include "spc.h"
#include "antenna.h"
#include "std.h"
#include "stfa.h"
#include "chain.h"

#define ANTENNA 0
#define DBG_LVL 4

swr_sdb_id mid, block, mafi;
struct chain_t *chain_mid;


void *mid_test( void *arg ) {
  swr_sdb_id rand, test_send, test_rcv;
  int i;

  PR( "getting sdbs\n" );
  chain_mid = swr_chain_create( NEW_SPC_VAR( "random", rand ),
                                NEW_SPC_VAR( "test_data_send", test_send ),
                                NEW_SPC( "mapper" ),
                                NEW_SPC_VAR( "midamble", mid ),
				NEW_SPC( "rrc" ),
                                NEW_SPC_VAR( "block", block ),
				NEW_SPC_VAR( "matched_filter", mafi ),
                                NEW_SPC( "slicer" ),
                                NEW_SPC_VAR( "test_data_rcv", test_rcv ),
				CHAIN_END );
  PR( "Adjusting block-size\n" );
  swr_sdb_set_config_int( block, "size", 10000 );
  PR( "Connecting second stream from test_send to test_rcv\n" );
  swr_conn_add( test_send, 1, test_rcv, 1 );

  // And send some slots...
  PR( "Send some slots\n" );

  for ( i=0; i<1; i++ ) {
    swr_sdb_send_msg( rand, SUBS_MSG_USER, NULL, -1 );
  }

  if ( swr_sdb_get_stats_int( test_rcv, "error" ) ) {
    PR( "Something went wrong, there are errors!\n" );
  } else {
    PR( " *** Test OK *** \n" );
  }
  swr_sdb_show_profile( mafi );

  return 0;
}

struct thread start;

/**
 * This function is called upon "insmod" and is used to register the
 * different parts of the module to the SPM.
 */
int um_module_init(void) {

  PR_CL( desc );
  if ( swr_thread_init( &start, mid_test, NULL ) ) {
    goto rrc_no_thread;
  }
  return 0;

rrc_no_thread:
  PR_DBG( 0, "Couldn't init thread\n" );
  return -1;
}

void um_module_exit( void ) {

  swr_thread_free( &start, NULL );
  PR_DBG( 0, "deleting se chain\n" );
  swr_chain_destroy( chain_mid );
}


module_init( um_module_init );
module_exit( um_module_exit );

EXPORT_SYMBOL(mid_test);