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--- exploring_lora [2018/10/10 10:17] – [1.2. Software Tools] samer
+++ exploring_lora [2018/10/22 15:17] – [5. Coverage Challenge] samer
@@ Line 131: / Line 131: @@
 For example, the scenario for assessing the impact of the spreading factor on the ToA consists of sending 100 packets for three different spreading factors //e.g.,// 7, 9, and 10, and drawing the average ToA or the distribution in a boxplot for comparing the results.
+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)
+  * 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]]
+Note that all messages sent and received by the [[https://www.airspayce.com/mikem/arduino/RadioHead/classRH__RF95.html| RH_RF95 RadioHead]] driver we are using conform to this packet format:
+  * 8 symbol PREAMBLE
+  * Explicit header with header CRC (handled internally by the radio)
+  * 4 octets HEADER: (TO, FROM, ID, FLAGS)
+  * 0 to 251 octets DATA
+  * CRC (handled internally by the radio)
 <WRAP center round help 100%>
@@ Line 168: / Line 182: @@
   * Direct transmission between the two devices is only considered.
-  * 3D distance is computed between devices.
+  * 3D distance is computed between devices. You can use for example [[https://support.google.com/earth/answer/148134?hl=en |  Google Earth pro]] or get the elevation from this [[ http://www.geocontext.org/publ/2010/04/profiler/en/ | site]].
   * 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 following online service [[https://cloudrf.com/ | Cloud RF]] to obtain information on the elevation, Fresnel zone, and estimated path loss.
 <WRAP center round help 100%>
-  * Compute the Fresnel zone for your transmission.
+  * 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 pathloss models.
+  * Provide the expression of the link budget and compute the received power using two different path loss models with Cloud RF.
   * Compare the received power obtained experimentally with the theoretical results.
-  * Prepare a short presentation to describe your experiment.
+  * Prepare a short presentation (5 minutes pitch) to describe your experiment.
 </WRAP>