/*****************************************************************************//*   FIle Name : interleaver.c                                               *//*   Description : WiMax OFDM FEC interleaver for Encoder                    *//*                 1st : i=(Ncbps/12)(kmod 12) + floor(k/12)                 *//*                 2nd : j=s*floor(i/s) + (i+Ncbps-floor(12*i/Ncbps))mod s   *//*   author : miffie                                                         *//*   Date   : Nov/03/05                                                      *//*   Copyright (c) 2005 miffie   All rights reserved.                          *//*****************************************************************************/struct binaryset interleaver (struct binaryset datain, char Ncpc ) {int 	ii , pp ;char 	shifter ;char 	ss ;struct 	binaryset bset ;char    *top1, *top2 ;//Ncbps is same as datain.size  //Main     PRINTF("interleaver size=%d\n", datain.size ) ;    if (((top1 = (char *)malloc(datain.size*sizeof(char)) ) == NULL) |        ((top2 = (char *)malloc(datain.size*sizeof(char)) ) == NULL)) {        PRINTF( " malloc failed in interleaver.c\n") ;    } //fail    else { //allocated     //permutation1     for(ii=0;ii<datain.size;ii++) { //p1      pp = (datain.size/12) * (ii % 12) + (ii/12) ;      //printf("permutation1 %d %d\n", ii, pp  ) ;      top1[ pp ] =  datain.data[ ii ] ;      //printf(" top1(%d)=%d \n", pp, top1[pp] ) ;     } //p1     //permutation2     ss = (Ncpc+1)/2 ;     for(ii=0;ii<datain.size;ii++) { //p2      pp = ss* (ii/ss) +             ( ii + datain.size - (12*ii/datain.size)) % ss ;      //printf("permutation2 %d %d\n", ii, pp ) ;      top2[ pp ] =  top1[ ii ] ;      //printf(" top2(%d)=%d \n", pp, top2[pp] ) ;     } //p2     bset.format = 0 ;     bset.size = datain.size ;     bset.data = top2 ;    }//allocated    free( top1 ) ;    free( datain.data ) ;    return ( bset ) ;} //interleaver