midamble.c

软件无线电的平台

/***************************************************************************
 *    midamble.c  - Software Radio module to insert a midamble
 *                           -------------------
 *   begin                :  02/10/24
 *   authors              :  Linus Gasser
 *   emails               :  [e-mail]
 ***************************************************************************/

/***************************************************************************
 *                                Changes
 *                                -------
 * date - name - description
 * 02/10/24 - ineiti - begin
 * 03/07/03 - selvan - added mimo 
 * 04/03/06 - ineiti - adjusted 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.                                   *
 *                                                                         *
 ***************************************************************************/


/**
 *  One of the most important modules: in order to be able to decode a
 * received signal, one has to make an estimation of the channel which is
 * then used to 'correct' the signal. This module provides a 'midamble' to
 * create a well-known series of symbols, and a 'matched_filter', which
 * tries to recognise the midamble part and correct for the wrongly received
 * signal.
 */

#include "spc.h"
#include "midamble.h"

#define DBG_LVL 0


/*
 * This function is called upon "insmod" and is used to register the
 * different parts of the module to the SPM.
 */
int spc_module_init(void) {
  // Initialise the midamble-generator module
  if ( send_module_init() ) {
    PR_DBG( 0, "Couldn't initilialise send-module!\n" );
    return -1;
  }

  // Initialise the matched-filter module
  if ( rcv_module_init() ) {
    PR_DBG( 0, "Couldn't initialise rcv-module!\n" );
    send_module_exit();
    return -1;
  }

  // And initialise some data-structures
  midamble_prepare();
  return 0;
}


/*
 * This is called upon rmmod
 */
void spc_module_exit( void ) {
  PR_DBG( 2, "Midamble is going\n" );
  rcv_module_exit();
  send_module_exit();
}


module_init( spc_module_init );
module_exit( spc_module_exit );