642 lines
6.2 KiB
C
642 lines
6.2 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 "defs.h"
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// Approximate 10*log10(x) in fixed point : x = 0...(2^32)-1
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int8_t dB_table[256] = {
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0,
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3,
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5,
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};
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int16_t dB_table_times10[256] = {
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0,
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30,
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};
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/*
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int8_t dB_fixed(int x) {
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int i=0,adj=0;
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int8_t log10=0;
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// find MSB
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for (i=31;i>=0;i--) {
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if ((x & (1<<i)) >= 1) {
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log10 = 3*i;
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i=0;
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}
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}
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// look at next 2 MSBs and adjust between 0-2
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if (i>1) {
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adj = (x>>(i-2))&3;
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if (adj == 1)
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log10 += 1;
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else if ((adj == 2) || (adj == 3))
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log10 += 2;
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}
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else
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log10 += (x&1 == 1) ? 1 : 0;
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return(log10);
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}
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*/
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int16_t dB_fixed_times10(uint32_t x)
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{
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int16_t dB_power=0;
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if (x==0) {
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dB_power = 0;
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} else if ( (x&0xff000000) != 0 ) {
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dB_power = dB_table_times10[((x>>24)&255)-1];
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dB_power += 3*dB_table_times10[255];
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} else if ( (x&0x00ff0000) != 0 ) {
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dB_power = dB_table_times10[((x>>16)&255)-1];
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dB_power += 2*dB_table_times10[255];
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} else if ( (x&0x0000ff00) != 0 ) {
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dB_power = dB_table_times10[((x>>8)&255)-1];
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dB_power += dB_table_times10[255];
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} else {
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dB_power = dB_table_times10[(x&255)-1];
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}
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if (dB_power > 900)
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return(900);
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return dB_power;
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}
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int8_t dB_fixed(uint32_t x)
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{
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int8_t dB_power=0;
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if (x==0) {
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dB_power = 0;
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} else if ( (x&0xff000000) != 0 ) {
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dB_power = dB_table[((x>>24)&255)-1];
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dB_power += 3*dB_table[255];
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} else if ( (x&0x00ff0000) != 0 ) {
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dB_power = dB_table[((x>>16)&255)-1];
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dB_power += 2*dB_table[255];
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} else if ( (x&0x0000ff00) != 0 ) {
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dB_power = dB_table[((x>>8)&255)-1];
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dB_power += dB_table[255];
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} else {
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dB_power = dB_table[(x&255)-1];
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}
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if (dB_power > 90)
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return(90);
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return dB_power;
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}
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int8_t dB_fixed2(uint32_t x, uint32_t y)
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{
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if ((x>0) && (y>0) )
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if (x>y)
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return(dB_fixed(x/y));
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else
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return(-dB_fixed(y/x));
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else if (y==0)
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return(127);
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else if (x==0)
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return(-128);
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return(0);
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}
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