?? dft256.c
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/*****************************************************************************//* FIle Name : dft256.c *//* Description : WiMax-OFDM DFT for Decoder *//* author : miffie *//* Date : Nov/02/05 *//* Copyright (c) 2005 miffie All rights reserved. *//*****************************************************************************/struct complexset dft256 (struct complexset datain ) {int nn , kk ;struct complexset cset ;struct complex *top , *p ;struct complex tmp1, tmp2 ;double p1 ; //Main PRINTF("dft256 size=%d\n", datain.size ) ; if ((top = (struct complex *)malloc(256*sizeof(struct complex)) ) == NULL) { PRINTF( " malloc failed in mapper.c\n") ; } //fail else { //allocated for(kk=-128;kk<=127;kk++) { //each sample //pilot tmp1.realp = 0 ; tmp1.image = 0 ; p= datain.data ; for(nn=0;nn<=255;nn++) { //each subcarrier p1 = 2*pi*nn*kk/256 ; tmp2.realp = cos( p1 ) ; tmp2.image = -sin( p1 ) ; tmp2 = multiply_complex(*p++ , tmp2) ; tmp1.realp += tmp2.realp ; tmp1.image += tmp2.image ; }//each subcarrier top[kk+128].realp = tmp1.realp ; top[kk+128].image = tmp1.image ; } //each sample cset.size = 256 ; cset.data = top ; }//allocated //free ( datain.data ) ; return ( cset ) ;} //dft256
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