dvdot.c

ofdm的完整系统模型,包含信道参数,多径模型,doppler频移等都可以自由修改!是您做仿真的有力帮助.c语言运行速度快!

/*
 *	*************************************************************************
 *	*									*
 *	*	This confidential and proprietary software may be used only	*
 *	*  as authorized by a licensing agreement from the Alta Group of	*
 *	*  Cadence Design Systems, Inc.  In the event of publication, the	*
 *	*  following notice is applicable:					*
 *	*									*
 *	*    (c) COPYRIGHT 1995 ALTA GROUP OF CADENCE DESIGN SYSTEMS, INC.	*
 *	*			ALL RIGHTS RESERVED				*
 *	*									*
 *	*	The entire notice above must be reproduced on all authorized	*
 *	*  copies.								*
 *	*									*
 *	*************************************************************************
 *
 */
/*
 * FILE:  dvdot.c
 * DATE:  Nov 1, 1989
 * RELATED FILES:  
 * AUTHOR:  Mark Schrank
 * DESCRIPTION:  "c" Dvdot function
 * NOTES/WARNINGS:  
 * REVISION HISTORY:
 *	Release		Who	Date	Comments
 *      2.6    John Lundell 02/23/90  Changed Macro calls to register pointers.
 */
#include "cgs.h"
/*
 *---------------------------------------------------------------
 * FUNCTION:  Dvdot(sp_src1,sp_src2,dp_result)
 * DESCRIPTION:  
 *	Performs a dot product between src1 and src2 store the result
 *	in result.
 *
 * RETURN VALUE:  The result
 * NOTES/WARNINGS: 
 * REVISION HISTORY:
 *	Release		Who	Date	Comments
 *      2.6    John Lundell 02/23/90  Changed Macro calls to register pointers.
 */
double  Dvdot(sp_src1, sp_src2, dp_result)
Ovector sp_src1;
Ovector sp_src2;
double  *dp_result;
{
	register long 	n = sp_src1->length;
	register char  	*s1 = sp_src1->virtstart;
	register char	*s2 = sp_src2->virtstart;
	register long	stp1 = sp_src1->stepsize;
	register long	stp2 = sp_src2->stepsize;
	register double	result = 0.0;

	while (n-- > 0) {
		result += *(double *)s1 * *(double *) s2;
		s1 += stp1;
		s2 += stp2;
	}

	*dp_result = result;
	return result;
}