long_track.c

This model is just testing an idea of MIMO, which IEEE802.11n will have. But I havo not seen the s

/*****************************************************************************/
/*   FIle Name : longtrack.c                                                 */
/*   Description : WLAN LONGsequence Decoder to initialize track SRAM        */
/*   author : miffie                                                         */
/*   Date   : aug/11/05                                                      */
/*   Copyright (c) 2005 miffie   All rights reserved.                        */
/*****************************************************************************/
///////////////////////////////////////////////////////////////////////////////

struct complexset long_track( struct complexset datain ) { // 
struct  complexset cset ;
struct  complexset ctop ;
struct  complex  *top  ;
struct  complex  tmp1  ;
int	ii , jj ;
static  char   longseq[] = { 0 , 0 , 0 , 0 , 0 , 0 , 1 , 1 ,    //-32 -25
                            -1 ,-1 , 1 , 1 ,-1 , 1 ,-1 , 1 ,    //-24 -17
                             1 , 1 , 1 , 1 , 1 ,-1 ,-1 , 1 ,    //-16 -9
                             1 ,-1 , 1 ,-1 , 1 , 1 , 1 , 1 ,    //-8 -1
                             0 , 1 ,-1 ,-1 , 1 , 1 ,-1 , 1 ,    // 0  7
                            -1 , 1 ,-1 ,-1 ,-1 ,-1 ,-1 , 1 ,    // 8  15
                             1 ,-1 ,-1 , 1 ,-1 , 1 ,-1 , 1 ,    //16  23
                             1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 } ;  //24  31

  //Main 
    if ((top = (struct complex *)malloc(53*sizeof(struct complex)) ) == NULL) {
        PRINTF( " malloc failed in long_track.c\n") ;
    } //fail
    else { //allocated
     PRINTF("long_track size=%d \n", datain.size ) ;
     for(ii=-26;ii<=26;ii++) { //each subcarrier
        tmp1.realp = longseq[ii +32] ; 
        tmp1.image = 0 ;
        tmp1 = division_complex(tmp1, datain.data[ii+32]) ;
        top[ii+26].realp  = tmp1.realp ; 
        top[ii+26].image  = tmp1.image ; 
     } //each subcarrier

     cset.size = 53 ;
     cset.data = top ;
    } //allocated
    free ( datain.data ) ;
    return( cset ) ;
} //long_track