radio_bs.c

软件无线电的平台

/***************************************************************************
               radio_bs.c  -  SRadio simple bs
                            -------------------
    begin                :  02/10/30
    authors              :  Linus Gasser
    emails               :  [e-mail]
 ***************************************************************************/

/***************************************************************************
                                 Changes
                                 -------
 date - name - description
 02/10/30 - ineiti - begin
 02/11/04 - ineiti - no msgqs...
 03/02/27 - ineiti - simplified to only two slots: BCH and RACH
 03/03/19 - ineiti - added SCH and gain-control
 03/11/11 - selvan - added MIMO capability
 03/11/24 - ineiti - prepared for Nicous LDPC
 12 january 2004 - chiurtu - make it general for MIMO LDPC
 04/04/08 - ineiti - changed from stfa_complex to stfa_ics
 
 **************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/


/**
 * Make a simple BS
 *
 * Function:
 * - emit sync
 * - listen to RACh
 */

#include "system.h"
#include "sdb.h"
#include "stfa.h"
#include "antenna.h"
#include "std.h"
#include "debugging.h"
#include "../ldpc_mimo.h"
#include "chain.h"
#include "spc.h"


#define ANTENNA 0
#define DBG_LVL 4
#define TARGET_MOBILE_HERE 1000*1000

swr_sdb_id stfa[NO_RX], sch, rcd, decoder;
struct chain_t *ch_bch, *ch_rach, *ch_up_rcv[NO_RX], *ch_test;

struct bch_struct bch_data;
double gain;

int looping, delay;

/**
 * Once a frame this function is called. Do here whatever seems accurate...
 */
int do_send_down( int msg, void *data, swr_sdb_id ret_id ) {
#ifdef USER_SPACE
  // Have some fun - move the BS. This is done 'automatically' in real-mode
//  swr_sdb_set_config_int( stfa[0], "offset_chips_rcv", delay++ );
//  swr_sdb_set_config_int( stfa[0], "offset_chips_rcv", 1 );
#endif

  return 0;
}


void *start_it( void *arg ) {
  swr_sdb_id mod, chest_rcv[NO_RX], rand_u8, rrc_rcv[NO_RX];
  int a;

  looping = 1;
  gain = 0.;

  usleep( 100000 );

  PR( "Init STFA[0]\n" );
  stfa[0] = swr_sdb_instantiate_name( "stfa_ics" );
  for ( a=1; a<NO_RX; a++ ){
    stfa[a] = swr_sdb_instantiate_name( "stfa_ics" );
    swr_sdb_set_config_int( stfa[a-1], "stfa_id", stfa[a] );
  }

  PR( "Initialized STFA[0]\n" );
  swr_sdb_set_config_int( stfa[0], "slots_per_frame", SLOTS );
  swr_sdb_set_config_int( stfa[0], "blocks_per_slot", SLOT_LEN );
  swr_sdb_set_config_int( stfa[0], "slot_send_offset", SLOT_OFFSET );
  

  PR( "Setting up BCh on slot 0\n" );
  ch_bch = swr_chain_create(
             NEW_SPC_VAR( "sch_send", sch ),
             NEW_SPC_VAR( "mapper", mod ),
             NEW_SPC( "spread" ),
             NEW_SPC( "chest_send" ),
             NEW_SPC( "synch_send" ),
             NEW_SPC( "rrc_complex_send" ),
             OLD_SPC_IN( stfa[0], 0 ),
             CHAIN_END );
  swr_stfa_notice_sdb( stfa[0], 0, sch );
  swr_sdb_set_config_int( sch, "id0", 0x1234 );
  swr_sdb_set_config_int( sch, "uplinks0", 2 );


  // Creating the first receiving chain...
  ch_up_rcv[0] = swr_chain_create(
              OLD_SPC_OUT( stfa[0], 1 ),
	      NEW_SPC_VAR( "rrc_complex_ics_rcv", rrc_rcv[0] ),
              NEW_SPC_VAR( "chest_rcv", chest_rcv[0] ),
#if 1
	      NEW_SPC_VAR( "ldpc_decode_2fold_general", decoder),
#else
	      NEW_SPC_VAR( "join", decoder ),
	      NEW_SPC( "slicer" ),
#endif
	      NEW_SPC_VAR( "test_data_rcv", rcd ),
              CHAIN_END );
  swr_sdb_set_config_int( rcd, "wait", 1 );
  swr_sdb_set_config_int( rcd, "mode", 1 );
  
  // Creating the other chains...
  for ( a=0; a<NO_RX; a++ ){
    if ( a > 0 ){
      ch_up_rcv[a] = swr_chain_create(
				      OLD_SPC_OUT( stfa[a], 1 ),
				      NEW_SPC_VAR( "rrc_complex_ics_rcv", rrc_rcv[a] ),
				      NEW_SPC_VAR( "chest_rcv", chest_rcv[a] ),
				      OLD_SPC_IN( decoder, a ),
				      CHAIN_END );
    }
    swr_sdb_set_config_int( rrc_rcv[a], "channel", a % 2 );
    swr_sdb_set_config_int( chest_rcv[a], "num_of_antennas", NO_RX );
    swr_sdb_set_config_int( chest_rcv[a], "index", a );
    swr_sdb_set_config_int_array( decoder, "chest", a, chest_rcv[a] );
    swr_sdb_set_config_int( chest_rcv[a], "circ_ext", 0 );
  }
  
  /*   swr_sdb_set_config_int( chest_rcv[0], "num_of_antennas", 2 ); */
  /*   swr_sdb_set_config_int( chest_rcv[1], "num_of_antennas", 2 ); */
  

  // Configure the decoder...
  swr_sdb_set_config_int( decoder, "ldpc_code_id", 1 );
  swr_sdb_set_config_int( decoder, "iterations", 15 );
  swr_sdb_set_config_int( decoder, "iterations_left", 1 );
  swr_sdb_set_config_int( decoder, "iterations_right", 1 );
  swr_sdb_set_config_int( decoder, "no_tx", NO_TX );
  swr_sdb_set_config_int( decoder, "no_rx", NO_RX );
  
  PR( "Connecting the test_data modules\n" );
  ch_test = swr_chain_create( NEW_SPC_VAR( "random", rand_u8 ),
				 OLD_SPC_IN( rcd, 1 ),
				 CHAIN_END );
  swr_sdb_set_config_int( rand_u8, "mode", 1 );
  swr_sdb_set_config_int( rand_u8, "seed", 0x1234 );
  call_module( rand_u8 );
  
  swr_stfa_notice_func( stfa[0], 2, do_send_down );
  swr_stfa_go( stfa[0] );
  
  while ( looping ) {
    usleep( 1000000 );
  }

  swr_stfa_stop( stfa[0] );

  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) {

  MOD_INC_USE_COUNT;
  looping = 1;
  delay = 0;
  ch_bch = NULL;
  ch_test = ch_rach = NULL;
  if ( swr_thread_init( &start, start_it, NULL ) ) {
    goto rrc_no_thread;
  }
  MOD_DEC_USE_COUNT;
  return 0;

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



void um_module_exit( void ) {
  int i;

  looping = 0;
  swr_thread_free( &start, NULL );
  PR_DBG( 0, "deleting everything\n" );
  swr_chain_destroy( ch_bch );
  swr_chain_destroy( ch_test );

  for ( i=NO_RX-1; i>=0; i-- ){
    swr_chain_destroy( ch_up_rcv[i] );
    swr_sdb_destroy( stfa[i] );
  }
}


module_init( um_module_init );
module_exit( um_module_exit );