genchannel.cpp

扩展的直序扩频系统

#include "Common.h"

void GenChannel(OUT complex *Channel_ImpRep)
{
	int i=0;
	float energy = 0.f, pn = 1.f, temp=0.f;
	FILE *fpt_channel;
	
	fpt_channel = fopen("Ideal_Mutichannel.dat", "wb");

	#if (NORM_DEFINITION ==1)        //Normalize channel energy every realization

		for(i=0; i<MULTIPATH_NUM; i++)
		{
			temp = (float)( exp(-i*20. / 16) / 2 );		 
			Channel_ImpRep[i].real = (float)( Gauss_rand() * sqrt( temp ) );     
			Channel_ImpRep[i].imag = (float)( Gauss_rand() * sqrt( temp ) );  
			energy += ComplexPow(Channel_ImpRep[i]);
		}
		
		energy = (float)sqrt(1.f / energy);
		
		for (i=0; i<MULTIPATH_NUM; i++)
		{
			Channel_ImpRep[i] = ComplexMulR(Channel_ImpRep[i], energy);
		}

	#else 

		for(i=0; i<MULTIPATH_NUM; i++)
		{
			Channel_ImpRep[i].real = (float)( Gauss_rand() * sqrt( pn/(2*MULTIPATH_NUM) ) );     
			Channel_ImpRep[i].imag = (float)( Gauss_rand() * sqrt( pn/(2*MULTIPATH_NUM) ) ); 
		}

	#endif

	fwrite(Channel_ImpRep, sizeof(complex), MULTIPATH_NUM, fpt_channel);     //保存供Rake使用

	fclose(fpt_channel);
}