qpsk

 

	int	i,k,j;
	static float a_A[4]= {1,1,-1,-1};
	static float b_A[4]= {1,-1,1,-1};
	float x,y;

 

	numberBits =0;

 

	while(IT_IN(0)) {

			
		numberBits++;
		if(numberBits == 2){	
			numberBits=0;

			
	                j=(int)(data(0)+2*data(1));
	                x=a_A[j];
	                y=b_A[j];
	
	                /* printf("data(0)=%f data(1)=%f j=%d x=%f y=%f \n",data(0),data(1),j,x,y); */


  			if(IT_OUT(0)) {
				KrnOverflow("qpsk",0) ;
				return(99);
			}
			
  			if(IT_OUT(1) ) {
				KrnOverflow("qpsk",0) ;
				return(99);
			}
  			inPhase(0) = x;
  			quadPhase(0) = y;
		}
		
	}
	return(0);

/*  Capsim (r) Text Mode Kernel (TMK) Star Library (Blocks)
    Copyright (C) 1989-2017  Silicon DSP Corporation

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    http://www.silicondsp.com
    Silicon DSP  Corporation
    Las Vegas, Nevada
*/

 

/**********************************************************************
				qpsk
 *********************************************************************
Description:
This star inputs data and ouputs the coordinates based on qpsk.
It produces an in phase and quadrature component.
Not very efficient but illustrative.

qpsk


This star inputs data and ouputs the coordinates based on qpsk.
It produces an in phase and quadrature component.
Not very efficient but illustrative.


Progrramer: Sasan Ardalan
Date: Dec 14, 2000

*/