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--- exploring_lora [2018/09/30 10:33] – [4.2. Coverage] samer
+++ exploring_lora [2018/10/06 13:47] – [1.3. Installation] samer
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 In order to design and implement experiments with LoRa, you will use the following devices:
-  * Arduino Mega (x2).
+  * Arduino Mega or Arduino Duemilanove (x2).
   * LoRa shields from [[http://www.dragino.com/products/module/item/102-lora-shield.html|Dragino]] (x2).
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   * Give the main characteristics of the LoRa shield from Dragino (www.dragino.com).
   * What type of Antenna are you using? Explain the corresponding characteristics.
-  * Give an estimated cost of your platform.
+  * Give an estimated cost of your devices.
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 ==== -. Software Tools ====
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 Unzip the RadioHead library and copy it to your sketchbook library folder as detailed in [[https://www.arduino.cc/en/Guide/Libraries]].
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-Note well the location of the library folder on your computer. In the following, you will be required to modify source files located in this folder.
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 ==== -. Installation ====
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 Connect the two Arduino devices to USB ports on your computer. If this is the first time you use Arduino IDE, make sure to install the necessary USB drivers by selecting ''Tools'' > ''Boards Manager'' and installing Arduino AVR boards.
-Now, you have to choose the ''Board'' type as ''Arduino/Genuino Mega 2560'' in the ''Tools'' menu and select the corresponding serial ''Port'' to start programming your Arduino.
+Now, you have to choose the ''Board'' type as ''Arduino/Genuino Mega 2560'' or ''Arduino Duemilanove or Diecimilia'' in the ''Tools'' menu and select the corresponding serial ''Port'' to start programming your Arduino.
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 For Arduino Mega 2560, additional drivers for Microsoft Windows can be installed from [[http://wch.cn/download/CH341SER_ZIP.html]].
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 ===== -. Theoretical Study =====
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   * What is the relation between processing gain and spreading factor in LoRa modulation? Explain.
   * How does the spreading factor impact the coverage of a LoRa transmitter?
-  * For each of the three possible configurations of your LoRa device, what is the transmission bit rate? Explain your computation.
+  * What is the transmission bit rate for each of the following configurations of your LoRa device? Explain your computation.
+    * Configuration 1: channel bandwidth = 125 kHz, spreading factor = 7, coding rate = 4/5
+    * Configuration 2: channel bandwidth = 500 kHz, spreading factor = 7, coding rate = 4/5
+    * Configuration 3: channel bandwidth = 125 kHz, spreading factor = 12, coding rate = 1/2
   * Compute the receiver sensitivity, assuming the following parameters: channel bandwidth = 125 kHz, spreading factor = 7, coding rate = 4/5, bit error rate (BER) target = 10<sup>-4</sup>, and receiver noise figure = 6 dB. Refer to this {{ :1705.05899.pdf | article}} to determine the mapping between the BER and the SNR.
   * Compare the computed sensitivity to that provided by the {{ :an1200.22.pdf |Semtech Application Note AN1200.22}} for the same parameters.
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 In this section, you will measure the coverage of LoRa under different radio configurations.
-Start by identifying a set of five geographical locations or Test Points (TP). These TPs should be astutely chosen to explore the limits of LoRa coverage. Then, you should implement a function on the server that measures the ratio of successfully delivered packets or PDR (Packet Delivery Ratio). Now, you should run the experiment for three different radio configurations: such configurations should ensure different reliability levels (high, medium, and low reliability).
+Start by identifying a set of five geographical locations or Test Points (TP). These TPs should be astutely chosen to explore the limits of LoRa coverage. Then, you should implement a function on the server that measures the ratio of successfully delivered packets or PDR (Packet Delivery Ratio). Now, you should run the experiment for three different radio configurations: such configurations should provide different reliability levels (high, medium, and low reliability).
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