dlamc.c

This is a OFDM wimax

#include "allocation.h"

#define DLAMC_GUARDLEFT 160
#define DLAMC_GUARDRIGHT 159
#define DLAMC_NC OFDMA_NC
#define DLAMC_NUMSUBCARRIERS 48
#define DLAMC_NUMSUBCHANNELS 32
#define DLAMC_BINSIZE 9
#define DLAMC_NUMBINS 6
#define DLAMC_DATACARRIERS (DLAMC_NC - DLAMC_GUARDLEFT - DLAMC_GUARDRIGHT - 1)

static int dlamc_setguard(char *cs) ;
/**********************************************************************
 * Function: dlamc_setcarriers
 * Parameters: cs, symbolnum, idcell
 *
 * Note that the parameters are for the sake of uniformity, in reality
 * they are not used
 * *******************************************************************/
int dlamc_setcarriers(char *cs, int symbolnum, int idcell)
{
		int j,k,m,numbins;
		int skip=0 ;

		dlamc_setguard(cs) ;
		numbins = DLAMC_DATACARRIERS/DLAMC_BINSIZE ;
		/** Pilots are in the central tone of each bin of 9 tones **/
		k = DLAMC_GUARDLEFT ; skip=0;
		for (j=0; j<numbins; j++)
		{
				if (skip == 0 && (k+4 >= 1024)) { skip=1; k++ ;}
				cs[k+4] = PILOT_MARK ;
				k += DLAMC_BINSIZE ;
		}
		skip=0 ;
		for (j=0; j<DLAMC_NUMSUBCHANNELS; j++)
		{
				for (k=0; k<DLAMC_NUMBINS; k++)
				{
					int offset = j*DLAMC_BINSIZE*DLAMC_NUMBINS + k*DLAMC_BINSIZE + DLAMC_GUARDLEFT ;
					for (m=0; m<4; m++)
					{
						if (skip == 0 && (offset+m >= 1024)) skip = 1 ;
						cs[offset+m+skip] = marker(j) ;
					}
					for (m=5; m<DLAMC_BINSIZE; m++)
					{
						if (skip == 0 && (offset+m >= 1024)) skip = 1 ;
						cs[offset+m+skip] = marker(j) ;
					}
				}
		}
		return 1 ;
}
static int dlamc_setguard(char *cs)
{
		int k;
		for (k=0; k<DLAMC_GUARDLEFT; k++)
		{
			cs[k] =  GUARD_MARK ;
		}
		for (k=0; k<DLAMC_GUARDRIGHT; k++)
		{
				cs[DLAMC_NC - k - 1] = GUARD_MARK ;
		}
		cs[1024] = DC_MARK ;
		return(0) ;
}