2.5 - Major refactor

models/hata.cc

@@ -0,0 +1,56 @@
+/*****************************************************************************
+*  HATA MODEL for Signal Server by Alex Farrant                              *
+*  30 December 2013							     *
+*  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 <math.h>
+
+double HATApathLoss(float f, float h_B, float h_M, float d, int mode)
+{
+/*
+HATA URBAN model for cellular planning
+Frequency (MHz) 150 to 1500MHz
+Base station height 30-200m
+Mobile station height 1-10m
+Distance 1-20km
+
+mode 1 = URBAN
+mode 2 = SUBURBAN
+mode 3 = OPEN
+*/
+
+	float lh_M = log10(11.75 * h_M);
+	float C_H = 3.2 * lh_M * lh_M - 4.97;
+
+	float logf = log10(f);
+
+	float L_u =
+	    69.55 + 26.16 * logf - 13.82 * log10(h_B) - C_H + (44.9 -
+							       6.55 *
+							       log10(h_B)) *
+	    log10(d);
+
+	if (!mode || mode == 1) {
+		return L_u;	//URBAN
+	}
+
+	if (mode == 2) {	//SUBURBAN
+		float logf_28 = log10(f / 28);
+		return L_u - 2 * logf_28 * logf_28 - 5.4;
+	}
+
+	if (mode == 3) {	//OPEN
+		return L_u - 4.78 * logf * logf + 18.33 * logf - 40.94;
+	}
+
+	return 0;
+}