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1 | /************************************************************************************ |
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2 | * Copyright (C) 2008 by Politehnica University of Bucharest and Rutgers University |
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3 | * All rights reserved. |
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4 | * Refer to LICENSE for terms and conditions of use. |
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5 | ***********************************************************************************/ |
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6 | //Petroaca - free space propagation model ; computes the received power of a frame according to the friis formula |
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7 | package vnsim.network.propagation; |
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8 | |
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9 | import vnsim.map.object.Globals; |
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10 | |
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11 | public class FreeSpace |
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12 | { |
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13 | |
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14 | public static double getPr(double Pt,double R) |
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15 | { |
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16 | if(Pt<=0.0 || R<=0.0) |
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17 | return -1; |
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18 | |
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19 | double aux=Globals.DSRC_LAMBDA/(4*Math.PI*R); |
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20 | |
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21 | return (Pt*Globals.ANTENNA_GAIN*Globals.ANTENNA_GAIN*(aux*aux))/Globals.SYSTEM_LOSS; |
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22 | } |
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23 | |
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24 | } |
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