#include <stdio.h>
#include <stdlib.h>
#include <math.h>

double EricssonpathLoss(float f, float TxH, float RxH, float d, int mode)
{
	/*
	   http://research.ijcaonline.org/volume84/number7/pxc3892830.pdf
	   AKA Ericsson 9999 model
	 */
	// Default is Urban which bizarrely has lowest loss
	double a0 = 36.2, a1 = 30.2, a2 = -12, a3 = 0.1;

	if (f < 150 || f > 3500) {
		printf
		    ("Error: Ericsson9999 model frequency range 150-3500MHz\n");
		exit(EXIT_FAILURE);
	}

	if (mode == 2) {	// Suburban / Med loss
		a0 = 43.2;
		a1 = 68.93;
	}
	if (mode == 1) {	// "Rural" but has highest loss according to Ericsson.
		a0 = 45.95;
		a1 = 100.6;
	}
	double g1 = (11.75 * RxH) * (11.75 * RxH);
	double g2 = (44.49 * log10(f)) - 4.78 * ((log10(f) * log10(f)));

	return a0 + a1 * log10(d) + a2 * log10(TxH) +
	    a3 * log10(TxH) * log10(d) - (3.2 * log10(g1)) + g2;
}