www.pudn.com > WCDMA.rar > Hadamard.cpp

#include  
#include  
#include  
#include  
 
int *Hadamard( unsigned N ) 
/************************************************************************************* 
/ int *Hadamard( unsigned N ) 
/ 
/ Copyright 2002 The Mobile and Portable Radio Research Group 
/ 
/ 
/ Produces a 2^N by 2^N Hadamard Matrix 
/ 
/ Returns an integer pointer to a 2^(2N) array that contains the resultant  
/ hadamard matrix 
/ 
/ Parmeters 
/	Input 
/		N	unsigned	Used to determine the size of the Hadamard matrix.  The size  
/						of the Hadamard matrix is 2^N by 2^N 
/ 
/*************************************************************************************/ 
{ 
	unsigned Nold,Nnew,k,j,i,Npower2,Nhalf; 
	int *Hold,*Hnew,*TempHold,*TempHnew; 
 
	Hold = (int *) calloc(1,sizeof(int)); 
	*Hold = 1; 
	Nold = 1; 
	k=0; 
	Npower2 = 1; 
 
	for (k=1; k<=N; k++) 
	{ 
		Npower2 = (unsigned) pow( (double) 2.0, (double) k); 
		Nnew = Npower2 * Npower2; 
		Hnew = (int *) calloc(Nnew,sizeof(int)); 
		if (Hnew == NULL) 
		{ 
			printf("\nk = %d: Matrix Hnew not allocated--exiting\n",k); 
			exit(NULL); 
		} 
		Nhalf = Npower2/2; 
 
		TempHold = Hold; 
		TempHnew = Hnew; 
		for (i=0; i