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/*****************************************************************************
* COST231-HATA MODEL for Signal Server by Alex Farrant *
* 30 December 2013i *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License or any later *
* version. *
* *
* This program is distributed in the hope that it will useful, but WITHOUT *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
* for more details. *
* */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double COST231pathLoss(float f, float TxH, float RxH, float d, int mode)
{
/*
COST231 extension to HATA model
Frequency 1500 to 2000MHz
TxH = Base station height 30 to 200m
RxH = Mobile station height 1 to 10m
Distance 1-20km
modes 1 = URBAN, 2 = SUBURBAN, 3 = OPEN
http://morse.colorado.edu/~tlen5510/text/classwebch3.html
*/
/* if (f < 150 || f > 2000) {
fprintf
(stderr,"Error: COST231 Hata model frequency range 150-2000MHz\n");
exit(EXIT_FAILURE);
}
*/
int C = 3; // 3dB for Urban
float lRxH = log10(11.75 * RxH);
float C_H = 3.2 * (lRxH * lRxH) - 4.97; // Large city (conservative)
int c0 = 69.55;
int cf = 26.16;
if (f > 1500) {
c0 = 46.3;
cf = 33.9;
}
if (mode == 2) {
C = 0; // Medium city (average)
lRxH = log10(1.54 * RxH);
C_H = 8.29 * (lRxH * lRxH) - 1.1;
}
if (mode == 3) {
C = -3; // Small city (Optimistic)
C_H = (1.1 * log10(f) - 0.7) * RxH - (1.56 * log10(f)) + 0.8;
}
float logf = log10(f);
double dbloss =
c0 + (cf * logf) - (13.82 * log10(TxH)) - C_H + (44.9 -
6.55 *
log10(TxH)) *
log10(d) + C;
return dbloss;
}