Changes
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For this tutorial lesson, you will use the same Downtown Ann Arbor scene you created in Tutorial Lesson 7. You can follow the same instructions in the section titled "Constructing the Downtown Ann Arbor Scene" of the previous lesson. Alternatively, you can download the "Ann Arbor Template" project using [http://www.emagtech.com/downloads/ProjectRepo/AnnArbor_Template.zip this link].
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Use the Basic Link Wizard to create a vertically polarized dipole transmitter and a grid of isotropic vertically polarized dipole receivers. Use the following parameters for the wizard:
{| class="wikitable"
|-
| area_size
| 250500| 450 850|-| Tx Location X| 0| 400 |-| Tx Location Y| 0| 580
|-
| Transmitter Height
| Receiver Spacing
| 5
| 5 10
|}
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[[Image:TER L8 PropDiag.png|thumb|left|480px|The Property dialog of the transmitterEM.Terrano's base location pointVariables Dialog.]]
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== Using Half-Wave Co-Polarized & Cross-Polarized Dipole Receivers ==
Your transmitter and receivers are vertically (Z-directed) polarized half-wave dipole antenna and your receivers are all isotropic.
Run a quick SBR analysis at the current location of the transmitter to establish a baseline for a vertically polarized dipole transmitter with a grid of vertically polarized dipole and receivers. Visualize the coverage map of your propagation scene.
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[[Image:TER L8 RxDiag1.png|thumb|left|600px|Changing the radiator type in the receiver point radiator set's property dialog.]]
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From the above two figures you can see that the maximum receiver power in the case of cross-polarized receivers drops down by 20dB 26dB with respect to the case of co-polarized receivers.
== Importing External Antenna Radiation Patterns for the Transmitter & Receivers ==
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After you download the radiation pattern file to your hard drive, open the property dialog of the transmitter point radiator set (TXB) and select the radio button labeled '''User Defined Antenna Pattern''' as the radiator type. Then click the {{key|Import}} button of the dialog. The Windows standard Open dialog opens up with the file type set to ".RAD". Browse your folders to find the downloaded pattern file. Select it and click the {{key|Open}} button. You will see the path of the downloaded file in the box next to the {{key|Import}} button.
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[[Image:TER L8 TxDiag2TER_L8_TXMproperty.png|thumb|left|600px|Changing the radiator type in the transmitter point radiator set's property dialog.]]
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Click the {{key|Transmitter Chain}} button of the transmitter set dialog to open the Transmitter Chain dialog. This dialog shows a block diagram of the transmitter circuit assumed by [[EM.Terrano]]. A voltage source with a source resistance of 50Ω is connected to a transmission line segment, with the antenna being its termination load. Enter 73Ω and 42.5Ω for the real and imaginary parts of the antenna's input impedance, <i>i.e.</i> in the boxes labeled '''Input Resistance''' and '''Input Reactance''', respectively. Also, note that the directivity of the antenna is automatically set to 10.188dB. This value came from the header of the radiation pattern file. Keep all the other default values. You are going to assume that the transmitter antenna is connected to the voltage source with a transmission line segment of negligible length.
Next open the property dialog of the receiver radiator point set and select the radio button labeled '''User Defined Antenna Pattern''' as the radiator type. Then click the {{key|Import}} button of the dialog. The Windows standard Open dialog opens up again with the file type set to ".RAD". Go to the folder "C:\Documents\EMAG\Models". Select the file "DPL_STD.RAD" and click the {{key|Open}} button.
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[[Image:TER L8 TxDiag1TER_L8_TxDiag2.png|thumb|left|640px600px|EM.Terrano's transmitter chain The Transmitter Chain button in the Receiver Set dialog.]]
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[[Image:TER L8 RxDiag2TxDiag1.png|thumb|left|600px640px|Changing the radiator type in the receiver setEM.Terrano's property transmitter chain dialog.]]
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Click the {{key|Receiver Chain}} button of the receiver set dialog to open the Receiver Chain dialog. This dialog shows a block diagram of the receiver circuit assumed by [[EM.Terrano]]. The antenna is connected to a low-noise amplifier (LNA) via a transmission line segment. The output of the LNA is terminated in a matched 50Ω load. Simlilar to the transmitter case, enter 73Ω and 42.5Ω for the real and imaginary parts of the antenna's input impedance, <i>i.e.</i> in the boxes labeled '''Input Resistance''' and '''Input Reactance''', respectively. Also, note that the directivity of the antenna is automatically set to 2.254dB, which is the typical directivity of a half-wave dipole radiator. Keep all the other default values and for now assume that the receiver antenna is connected to the LNA with a transmission line segment of negligible length.
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[[Image:TER L8 RxDiag2.png|thumb|left|600px|The Receiver Chain button in the Receiver Set dialog.]]
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[[Image:TER L8 Map6.png|thumb|left| 720px |The connectivity map of the Ann Arbor scene with SNR<sub>min</sub> = 10dB and the rainbow with basic color map option.]]
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At the end of the SBR simulation, the value of SNR is computed for all the receivers. The receiver set dialog shows the values of both receiver power (in dBm) and SNR (in dB). For example, the figure below shows that the receiver power by receiver No. 1502 6577 located at (0390, -145m760m, 1.5m) is -2845.4dBm 961dBm and the SNR is 4425.921dB170dB. This receiver is located 145m south of 180m away from the transmitter location.
The connectivity map is a binary color map. All the receivers whose computed SNR value is above this minimum are considered "Connected" and are shown in red (or white). The unconnected or disconnected receivers are shown in purple (or black). To plot the connectivity map in black and white colors, right-click on its name in the navigation tree and select '''Properties…''' from the contextual menu. In the output plot settings dialog, change the color map option from the default '''RainbowBasic''' to '''BasicRainbow'''.
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[[Image:TER L8 PlotProp.png|thumb|left|480px|Changing the color map option from the default Rainbow to Basic to Rainbow in Output Plot Settings dialog.]]
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[[Image:TER L8 Map7.png|thumb|left| 720px |The connectivity map of the Ann Arbor scene with SNR<sub>min</sub> = 10dB and the basic Rainbow color map option.]]
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