Differences

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--- exploring_lora [2019/10/06 13:03] – [5. Coverage Challenge] samer
+++ exploring_lora [2020/11/19 22:31] – [5. Coverage Challenge] samer
@@ Line 73: / Line 73: @@
 ==== -. Modifying the Radio Parameters ====
-Download the {{ :sketch-1819.zip | basic sketches}} that implement a simple LoRa communication between two devices: a client and a server. Open the sketches with Arduino IDE. Make sure to choose the correct ''Board'' and ''Port'' in the ''Tools'' menu.
+Download the {{ :sketch-1819.zip | basic sketches}} that implement a simple LoRa communication between two devices: a client and a server. Open the sketches with Arduino IDE (it is preferable to run Arduino IDE as administrator). Make sure to choose the correct ''Board'' and ''Port'' in the ''Tools'' menu.
 Take a look at the source code in ''rf95_client.ino'' and ''rf95_server.ino''. Particularly, the following extract from the ''setup'' function configures the radio parameters of your LoRa devices:
@@ Line 134: / Line 134: @@
 As for the theoretical computation of the ToA, you can refer to the the following documents :
-  * The Semtech [[http://semtech.com/uploads/documents/DS_SX1276-7-8-9_W_APP_V5.pdf| specification]] (section 4.1.1.6)
+  * The Semtech {{ :ds_sx1276-7-8-9_w_app_v5.pdf |specification}} (section 4.1.1.6)
   * An explanatory video: https://www.youtube.com/watch?v=C_Rh5GSENA4
   * Various calculation tools available online: https://www.loratools.nl/#/airtime, [[https://docs.google.com/spreadsheets/d/1voGAtQAjC1qBmaVuP1ApNKs1ekgUjavHuVQIXyYSvNc/edit?usp=sharing |Spreadsheet]]
@@ Line 151: / Line 151: @@
   * Visualise the experimental results by plotting the ToA as a function of each one of the different parameters.
   * Analyze the obtained results and compare with the theoretical computations. You can superpose the theoretical results and the experimental ones on the same graph.
-</WRAP>
-==== -. Coverage ====
-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 provide different reliability levels (high, medium, and low reliability).
-<WRAP center round help 100%>
-  * Draw the test points on a map and motivate your choices.
-  * Describe the radio configurations you selected and their impact on the reliability of the transmission.
-  * Visualise the experimental results by plotting the PDR for each TP and each radio configuration.
-  * Analyze the obtained results.
 </WRAP>
 ==== -. [Classroom activity] Collisions and Packet Delivery Ratio ====
-In this section, you will measure the impact of the packet arrival rate on the collision rate and consequently the PDR.
+In this section, you will measure the impact of the packet arrival rate on the collision rate and consequently the Packet Delivery Ratio (PDR).
 The setting for this experiment is unique:
   * Only one server is required in the classroom. This server should compute the ratio of successfully delivered packets or PDR.
   * All groups are required to use the same frequency, spreading factor, and coding rate.
-  * The average packet arrival rate is equal for all clients. The delay between two packets is drawn uniformly in a predefined interval.
+  * The average packet arrival rate is equal for all clients.
 <WRAP center round help 100%>
@@ Line 191: / Line 179: @@
   * Direct transmission between the two devices is only considered.
-  * 3D distance is computed between devices. You can get the elevation from this [[ http://www.geocontext.org/publ/2010/04/profiler/en/ | site]].
+  * 3D distance is computed between devices.
   * PDR must be higher than 10% as computed for 100 packets.
   * Supporting live video and screen capture should be used to authenticate the record.
-You can use the [[https://cloudrf.com/ | Cloud RF]] online service to obtain information on the elevation, Fresnel zone, and estimated path loss.
+You can use [[https://cloudrf.com/ | Cloud RF]] or [[http://radiomobile.pe1mew.nl/index.php?Welcome... | Radio Mobile]] online service to obtain information on the elevation, Fresnel zone, and estimated path loss.
-<WRAP center round todo 60%>
-Take a look at this tool [[http://radiomobile.pe1mew.nl/index.php?Welcome...]].
-</WRAP>
 <WRAP center round help 100%>
-  * Compute the Fresnel zone for your transmission using [[https://cloudrf.com/ | Cloud RF]]. Comment the result.
+  * Compute the Fresnel zone for your transmission. Comment the result.
   * Provide the expression of the link budget and compute the received power using two different path loss models (ITM, Line of sight) with Cloud RF.
-  * Compare the received power obtained experimentally with the results of Cloud RF.
+  * Compare the received power obtained experimentally with the results of the online simulators.
   * Prepare a short presentation (5 minutes pitch) to describe your experiment.
 </WRAP>