[31] | 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 | package vnsim.network; |
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| 7 | |
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| 8 | |
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| 9 | import java.io.Serializable; |
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| 10 | import java.util.List; |
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| 11 | |
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| 12 | import vnsim.applications.adaptiveTL.WirelessTrafficLight; |
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| 13 | import vnsim.core.Communicator; |
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| 14 | import vnsim.core.events.*; |
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| 15 | import vnsim.map.object.*; |
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| 16 | import vnsim.map.utils.*; |
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| 17 | |
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| 18 | |
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| 19 | |
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| 20 | |
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| 21 | |
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| 22 | public class RadioDev implements Serializable{ |
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| 23 | |
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| 24 | /** <code>serialVersionUID</code> */ |
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| 25 | private static final long serialVersionUID = -5883719321862303634L; |
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| 26 | |
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| 27 | public static final long LIGHT_SPEED = 299792458; // m/s |
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| 28 | |
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| 29 | public static final long FREQUENCY = 2400000000L; //Hz |
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| 30 | |
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| 31 | public static final double LAMBDA = (double)LIGHT_SPEED/FREQUENCY; |
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| 32 | |
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| 33 | private Communicator communicator; |
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| 34 | |
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| 35 | // height of the antenna in m |
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| 36 | private double antennaHeight; |
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| 37 | |
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| 38 | // radio device sensitivity in DBm (decibel referenced to 1 mW power) |
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| 39 | public double sensitivity; |
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| 40 | |
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| 41 | public double rxThreshold; |
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| 42 | |
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| 43 | public double rxThreshold_W; |
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| 44 | |
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| 45 | public double snrThreshold; |
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| 46 | |
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| 47 | // transmission power in DBm |
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| 48 | public double txPower; |
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| 49 | |
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| 50 | // antenna gain in DBm |
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| 51 | public double gain; |
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| 52 | |
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| 53 | public int lastTxTime = 0; |
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| 54 | |
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| 55 | public RadioDev(Communicator c){ |
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| 56 | communicator = c; |
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| 57 | |
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| 58 | antennaHeight = 1.5; // m |
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| 59 | |
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| 60 | sensitivity = -91.0; //DBm |
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| 61 | |
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| 62 | snrThreshold = 9.1; |
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| 63 | |
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| 64 | rxThreshold = -81.0; // DBm |
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| 65 | rxThreshold_W = convertDBmToW(rxThreshold); |
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| 66 | |
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| 67 | txPower = 15; //DBm |
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| 68 | //30 + 10 * Math.log10(0.1); |
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| 69 | |
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| 70 | gain = 0; // DBm |
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| 71 | } |
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| 72 | |
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| 73 | public ReceiveEvent receive(List<ReceiveEvent> receivedSignals){ |
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| 74 | |
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| 75 | if (Globals.engine.crtTime == communicator.getRadio().lastTxTime){ |
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| 76 | // ignore all signals, receiver radio in transmit mode |
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| 77 | return null; |
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| 78 | } |
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| 79 | |
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| 80 | int capturableSignals = 0; |
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| 81 | ReceiveEvent max = null; |
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| 82 | double maxrxpower = -1000; |
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| 83 | double maxrxpower_W = 0; |
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| 84 | double totalPower = 0; |
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| 85 | double totalPower_W = 0; |
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| 86 | |
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| 87 | for (ReceiveEvent re : receivedSignals){ |
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| 88 | RadioDev txradio = re.sender.getRadio(); |
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| 89 | |
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| 90 | Road r1 = (Road) Globals.map.roads.get(re.sender.getRoadIdx()); |
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| 91 | Point p1 = (Point) r1.points.get(re.sender.getPointIdx()); |
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| 92 | Road r2 = (Road) Globals.map.roads.get(communicator.getRoadIdx()); |
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| 93 | Point p2 = (Point) r2.points.get(communicator.getPointIdx()); |
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| 94 | double distance = GPSutil.distance(p1, p2); |
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| 95 | |
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| 96 | double pl = pathloss(re.sender, communicator, distance); |
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| 97 | double rxpower = txradio.getTxPower() - pl; |
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| 98 | double rxpower_W = convertDBmToW(rxpower); |
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| 99 | |
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| 100 | totalPower += rxpower; |
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| 101 | totalPower_W += rxpower_W; |
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| 102 | |
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| 103 | if (rxpower > maxrxpower){ |
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| 104 | maxrxpower = rxpower; |
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| 105 | maxrxpower_W = rxpower_W; |
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| 106 | max = re; |
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| 107 | } |
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| 108 | |
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| 109 | // if (distance > 0.7) |
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| 110 | // System.out.println("DIST="+distance+"; RXPOWER="+rxpower+"; THR="+rxThreshold); |
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| 111 | |
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| 112 | if (rxpower >= this.rxThreshold){ |
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| 113 | capturableSignals ++; |
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| 114 | |
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| 115 | |
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| 116 | |
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| 117 | if (distance > Globals.maxRange ) |
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| 118 | Globals.maxRange = distance; |
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| 119 | |
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| 120 | } |
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| 121 | } |
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| 122 | Globals.packets += capturableSignals; |
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| 123 | double noise_W = totalPower_W - convertDBmToW(maxrxpower); |
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| 124 | if (capturableSignals > 1){ |
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| 125 | int i = 0; |
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| 126 | i++; |
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| 127 | } |
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| 128 | if (maxrxpower_W >= this.rxThreshold_W && |
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| 129 | maxrxpower_W >= noise_W * this.snrThreshold){ |
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| 130 | Globals.lost += capturableSignals - 1; |
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| 131 | return max; |
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| 132 | } |
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| 133 | |
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| 134 | if (capturableSignals == 1){ |
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| 135 | Globals.interfered ++ ; |
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| 136 | } |
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| 137 | |
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| 138 | if (capturableSignals > 0){ |
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| 139 | // collision |
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| 140 | Globals.collided += capturableSignals; |
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| 141 | return null; |
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| 142 | } |
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| 143 | |
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| 144 | // only weak signals |
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| 145 | return null; |
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| 146 | } |
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| 147 | |
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| 148 | // Two ray pathloss |
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| 149 | public static double pathloss(Communicator s, Communicator d, double distance){ |
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| 150 | RadioDev tx = s.getRadio(); |
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| 151 | RadioDev rx = d.getRadio(); |
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| 152 | |
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| 153 | distance *= 1000; |
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| 154 | if (distance < 1) |
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| 155 | return 0; |
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| 156 | |
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| 157 | double pathloss = -(tx.getGain() + rx.getGain()); |
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| 158 | double freeSpace = (4.0 * Math.PI * distance) / LAMBDA; |
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| 159 | double planeEarth = (distance * distance) / (tx.antennaHeight * rx.antennaHeight); |
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| 160 | |
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| 161 | if (planeEarth > freeSpace){ |
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| 162 | pathloss += 20.0 * Math.log10(planeEarth); |
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| 163 | }else{ |
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| 164 | pathloss += 20.0 * Math.log10(freeSpace); |
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| 165 | } |
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| 166 | |
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| 167 | return pathloss; |
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| 168 | } |
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| 169 | /** |
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| 170 | * |
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| 171 | * @param dbm power value in DBm |
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| 172 | * @return power in mW |
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| 173 | */ |
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| 174 | public static double convertDBmToW(double dbm){ |
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| 175 | return Math.pow(10, (dbm - 30) / 10); |
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| 176 | } |
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| 177 | |
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| 178 | /** |
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| 179 | * |
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| 180 | * @param w power in watts |
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| 181 | * @return value in DBm |
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| 182 | */ |
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| 183 | public static double convertWToDBm(double w){ |
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| 184 | return 30 + Math.log10(w); |
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| 185 | } |
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| 186 | |
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| 187 | public double getGain() { |
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| 188 | return gain; |
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| 189 | } |
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| 190 | |
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| 191 | public void setGain(double gain) { |
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| 192 | this.gain = gain; |
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| 193 | } |
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| 194 | |
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| 195 | public double getSensitivity() { |
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| 196 | return sensitivity; |
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| 197 | } |
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| 198 | |
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| 199 | public void setSensitivity(double sensitivity) { |
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| 200 | this.sensitivity = sensitivity; |
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| 201 | } |
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| 202 | |
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| 203 | public double getTxPower() { |
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| 204 | return txPower; |
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| 205 | } |
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| 206 | |
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| 207 | public void setTxPower(double txPower) { |
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| 208 | this.txPower = txPower; |
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| 209 | } |
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| 210 | |
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| 211 | public void setRadioTxMode(){ |
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| 212 | lastTxTime = Globals.engine.crtTime; |
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| 213 | } |
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| 214 | } |
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