gauthier
c7518ecf42
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7885 818b1a75-f10b-46b9-bf7c-635c3b92a50f
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr
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Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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*******************************************************************************/
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/******************************
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* file: angle.c
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* purpose: compute the angle of a 8 bit complex number
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* author: florian.kaltenberger@eurecom.fr
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* date: 22.9.2009
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*******************************/
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#include "costable.h"
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#include "defs.h"
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unsigned int angle(struct complex16 perror)
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{
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int a;
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// a = atan(perror.i/perror.r);
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//since perror is supposed to be on the unit circle, we can also compute a by
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if (perror.i>=0) {
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if (perror.r>=0)
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a = acostable[min(perror.r,255)];
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else
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a = 32768-acostable[min(-perror.r,255)];
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//a = asin(perror.i);
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} else {
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if (perror.r>=0)
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a = 65536-acostable[min(perror.r,255)];
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else
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a = 32768+acostable[min(-perror.r,255)];
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//a = 2*PI-asin(perror.i);
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}
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return a;
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}
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