exploring_lora
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exploring_lora [2018/09/27 16:28] – [4.1. Time on Air] samer | exploring_lora [2018/09/29 12:59] – [3.1. Modifying the Radio Parameters] samer | ||
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Download the following software on your PC: | Download the following software on your PC: | ||
- | * RadioHead: The Packet Radio library for embedded microprocessors can be downloaded from [[http://www.airspayce.com/mikem/ | + | * RadioHead: The Packet Radio library for embedded microprocessors can be downloaded from [[https://github.com/samerlahoud/ |
* Arduino IDE: Specific OS versions can be downloaded from [[https:// | * Arduino IDE: Specific OS versions can be downloaded from [[https:// | ||
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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. | 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. | ||
</ | </ | ||
- | |||
==== -. Installation ==== | ==== -. Installation ==== | ||
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</ | </ | ||
+ | In the remainder of this lab, you will conduct measurements to validate the obtained theoretical receiver sensitivity. | ||
===== -. Configuring and Running the Lab ===== | ===== -. Configuring and Running the Lab ===== | ||
==== -. Modifying the Radio Parameters ==== | ==== -. Modifying the Radio Parameters ==== | ||
- | Start by setting | + | Download the {{ : |
+ | |||
+ | Take a look at the source code in '' | ||
+ | |||
+ | * Central frequency (freq) | ||
+ | * Spreading Factor (SF) | ||
+ | * Bandwidth (Bw) | ||
+ | * Coding Rate (CR) | ||
+ | * Transmit power (Pow) | ||
+ | |||
+ | <code c++> | ||
+ | rf95.setFrequency(frequency); | ||
+ | // Setup Power,dBm | ||
+ | rf95.setTxPower(13); | ||
+ | |||
+ | // Setup Spreading Factor (6 ~ 12) | ||
+ | rf95.setSpreadingFactor(7); | ||
+ | |||
+ | // Setup BandWidth, option: 7800, | ||
+ | //Lower BandWidth for longer distance. | ||
+ | rf95.setSignalBandwidth(125000); | ||
+ | |||
+ | // Setup Coding Rate: | ||
+ | rf95.setCodingRate4(5); | ||
+ | </ | ||
+ | |||
+ | In order to reduce collisions, configure | ||
^ Group Number | ^ Group Number | ||
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| | | | ||
- | For this, open the '' | ||
- | |||
- | <file cpp RH_RF95.cpp> | ||
- | setFrequency(86X.Y); | ||
- | </ | ||
- | |||
- | The typical configuration for LoRa modules consists of 125 kHz sub-channels, | ||
- | |||
- | * Bw125Cr45Sf128 | ||
- | * Bw125Cr48Sf4096 | ||
- | * Bw31_25Cr48Sf512 | ||
- | |||
- | Radio configuration is applied in '' | ||
- | <file cpp RH_RF95.cpp> | ||
- | setModemConfig(Bw125Cr45Sf128); | ||
- | </ | ||
==== -. Running Basic Sketches ==== | ==== -. Running Basic Sketches ==== | ||
- | Download the {{ : | + | Now you can compile and upload |
[{{ : | [{{ : | ||
[{{ : | [{{ : | ||
- | |||
- | In the remainder of this lab, you will conduct measurements to validate the obtained theoretical receiver sensitivity. | ||
===== -. Performance Evaluation ===== | ===== -. Performance Evaluation ===== | ||
In the following, you will design and implement a set of scenarios that enable to evaluate the performance of the LoRa modulation. As you will deal with scientific assessment, you are required to use scientific tools to show the results. You have the choice between [[http:// | In the following, you will design and implement a set of scenarios that enable to evaluate the performance of the LoRa modulation. As you will deal with scientific assessment, you are required to use scientific tools to show the results. You have the choice between [[http:// | ||
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<WRAP center round help 100%> | <WRAP center round help 100%> | ||
+ | * Join commented extracts of your code and explain your approach for computing the ToA. | ||
* Draw a box plot of the ToA under the three different radio configurations and for three different message sizes. | * Draw a box plot of the ToA under the three different radio configurations and for three different message sizes. | ||
* Analyze the obtained results and compare with the theoretical computations. You can superpose the theoretical results and the practical ones on the same graph. | * Analyze the obtained results and compare with the theoretical computations. You can superpose the theoretical results and the practical ones on the same graph. | ||
</ | </ | ||
- | |||
==== -. Packet Delivery Ratio ==== | ==== -. Packet Delivery Ratio ==== | ||
exploring_lora.txt · Last modified: 2021/10/20 12:52 by samer