2.5 - Major refactor

models/cost.cc

@@ -0,0 +1,60 @@
+/*****************************************************************************
+*  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) {
+		printf
+		    ("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)
+		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;
+}