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