exploring_lora
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exploring_lora [2018/09/29 14:09] – [4.2. Packet Delivery Ratio] samer | exploring_lora [2018/09/29 17:32] – [4.3. [Classroom activity] Collisions and Packet Delivery Ratio] samer | ||
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In this section, you will measure the Time on Air (ToA) as given by the time necessary to transmit a message on the radio interface. You will assess the impact of the spreading factor, bandwidth, coding rate, and the message size on the ToA. | In this section, you will measure the Time on Air (ToA) as given by the time necessary to transmit a message on the radio interface. You will assess the impact of the spreading factor, bandwidth, coding rate, and the message size on the ToA. | ||
- | For this, you will start by implementing a function on the client that measures the time necessary for sending a message. For example, you can use the [[https:// | + | For this, you will start by implementing a function on the client that measures the time necessary for sending a message. For example, you can use the [[https:// |
<WRAP center round help 100%> | <WRAP center round help 100%> | ||
- | * Describe the scenarios you used for assessing the impact of the different parameters on the ToA. You can join commented extracts of your code. | + | * Describe the scenarios you used for assessing the impact of the different parameters on the ToA. |
+ | * Join commented extracts of your code and raw data in attached files. | ||
* Visualise the experimental results by plotting the ToA as a function of each one of the different parameters. | * 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. | * Analyze the obtained results and compare with the theoretical computations. You can superpose the theoretical results and the experimental ones on the same graph. | ||
</ | </ | ||
- | ==== -. Packet Delivery Ratio ==== | ||
- | In this section, you will measure the Packet Delivery Ratio (PDR) under the three different radio configurations and for different transmission periods. For this, you can start by implementing a function on the client that measures the ratio of successfully delivered packets. | + | ==== -. Coverage ==== |
- | Only for this test, all groups are required to use the same frequency | + | In this section, you will measure |
+ | |||
+ | For this, you will start by identifying a set of geographical locations or Test Points | ||
<WRAP center round help 100%> | <WRAP center round help 100%> | ||
- | * Draw the PER as a function of the transmission period for the different | + | * Draw the test points on a map and motivate your choices. |
- | * What type of mathematical models enables to theoretically compute | + | * Visualise |
+ | * Analyze | ||
</ | </ | ||
+ | ==== -. [Classroom activity] Collisions and Packet Delivery Ratio ==== | ||
- | ==== -. Coverage ==== | + | In this section, you will measure the impact of collisions on the network throughput using different transmission periods. |
+ | The setting for this experiment is unique: | ||
- | In this section, you will measure | + | * Only one server is required in the classroom. This server should compute |
- | + | * All groups are required | |
- | <code c++> | + | |
- | rf95.setModemConfig(RH_RF95:: | + | |
- | rf95.setModemConfig(RH_RF95:: | + | |
- | rf95.setModemConfig(RH_RF95:: | + | |
- | </ | + | |
<WRAP center round help 100%> | <WRAP center round help 100%> | ||
- | * Draw the test points on a map. | + | * Draw the PER as a function of the transmission period. Analyze your results. |
- | * Give a statistical measure | + | * What type of mathematical models enables to theoretically compute |
</ | </ | ||
- | ==== -. Path Loss ==== | + | |
+ | ===== -. 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 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. | ||
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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:// | 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:// | ||
- | ===== -. Coverage Challenge ===== | ||
exploring_lora.txt · Last modified: 2021/10/20 12:52 by samer