Parminder Singh
209785551a
- updated return function value to -1 - removed static variable for dmrs symbol selection for channel - Updated sin cos quadrant check conditions - removed casting from PTRS slope and related calculations
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <time.h>
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#include "sim.h"
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/* linear phase noise model */
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void phase_noise(double ts, int16_t * InRe, int16_t * InIm)
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{
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static double i=0;
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int32_t x=0 ,y=0;
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double fd = 300;//0.01*30000
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int16_t SinValue = 0, CosValue= 0;
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double IdxDouble = (double)(i*fd * ts * ResolSinCos * 4);
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int16_t IdxModulo = ((int32_t)(IdxDouble>0 ? IdxDouble+0.5 : IdxDouble-0.5)) % (ResolSinCos*4);
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IdxModulo = IdxModulo<0 ? IdxModulo+ResolSinCos*4 : IdxModulo;
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if(IdxModulo<2*ResolSinCos)//< 2 check for 1st and 2nd
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{
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if(IdxModulo>=ResolSinCos)//>= 1 is 2nd Quadrant
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{
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SinValue = LUTSin[2*ResolSinCos-IdxModulo];
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CosValue = -LUTSin[IdxModulo-ResolSinCos];
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}
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else// 1st Quadrant
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{
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SinValue = LUTSin[IdxModulo];
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CosValue = LUTSin[ResolSinCos-IdxModulo];
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}
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}
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else if((IdxModulo>2*ResolSinCos))//> 2 check for 3rd and 4th
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{
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if(IdxModulo>=3*ResolSinCos)//> 3 is 4th Quadrant
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{
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SinValue = -LUTSin[4*ResolSinCos-IdxModulo];
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CosValue = LUTSin[IdxModulo-3*ResolSinCos];
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}
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else//3rd Quadrant
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{
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SinValue = -LUTSin[IdxModulo-2*ResolSinCos];
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CosValue = -LUTSin[3*ResolSinCos-IdxModulo];
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}
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}
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else
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{
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AssertFatal(0==1,"Error in look-up table of sine function!\n");
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}
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x = ( ((int32_t)InRe[0] * CosValue) - ((int32_t)InIm[0] * SinValue ));
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y = ( ((int32_t)InIm[0] * CosValue) + ((int32_t)InRe[0] * SinValue ));
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InRe[0]= (int16_t)(x>>14);
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InIm[0]= (int16_t)(y>>14);
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i++;
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}
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/* Initialisation function for SIN table values */
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void InitSinLUT( void ) {
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for ( int i=0; i<(ResolSinCos+1); i++ ) {
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LUTSin[i] = sin((double)(M_PI*i)/(2*ResolSinCos)) * (1<<14); //Format: Q14
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}
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}
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