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--- exploring_lora [2018/09/29 23:26] – [4.3. [Classroom activity] Collisions and Packet Delivery Ratio] samer
+++ exploring_lora [2018/09/29 23:36] – [5. Coverage Challenge] samer
@@ Line 159: / Line 159: @@
 ===== -. Coverage Challenge =====
-In this section, you will study the properties of the radio channel as used by the LoRa technology. For this, you should obtain a large set of RSSI values for different distances, preferably in a free space setting.
+In this section, you are required to establish a record of LoRa coverage. Some rules must be followed to validate the record:
+  * Direct transmission between the two devices is only considered.
+  * 3D distance is computed between devices.
+  * PDR must be higher than 10% as computed for 100 packets.
 <WRAP center round help 100%>
@@ Line 168: / Line 172: @@
   * Compare the obtained sensitivity with the theoretical results computed in the previous section.
 </WRAP>
-In order to compute distances in your experiment, you can get the GPS coordinates as recorded by your smartphone using an application such as [[https://play.google.com/store/apps/details?id=com.flashlight.lite.gps.logger&hl=en|Ultra GPS Logger]]. You can export the time-location correspondence in a CSV format from this application. As for the time-RSSI correspondence, you can use a {{ :log-windows.py.zip |logger file}} on your laptop. Finally, the time matching enables you to obtain the RSSI for each GPS location, hence for different distances.
 ===== -. Grading =====