exploring_lora
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exploring_lora [2021/08/28 09:46] – [-. Configuring and Running the Lab] samer | exploring_lora [2021/10/20 12:52] (current) – [4.2 Collisions and Packet Delivery Ratio] samer | ||
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<WRAP center round tip 75%> | <WRAP center round tip 75%> | ||
- | For Arduino Mega 2560, additional drivers for Microsoft Windows | + | For Arduino Mega 2560, additional drivers for Microsoft Windows can be installed from [[http:// |
For Arduino Duemilanove, | For Arduino Duemilanove, | ||
[[https:// | [[https:// | ||
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* 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. | ||
</ | </ | ||
- | ==== - [Classroom activity] | + | ==== - Collisions and Packet Delivery Ratio ==== |
- | In this section, you will measure | + | In this section, you will compute |
- | The setting | + | Let us consider an ALOHA model for the random access |
- | * Only one server is required | + | |
- | * All groups are required to use the same frequency, spreading factor, and coding rate. | + | |
- | * The average packet arrival rate is equal for all clients. | + | |
<WRAP center round help 100%> | <WRAP center round help 100%> | ||
- | * Draw the PDR as a function of the average arrival rate. Analyze | + | * What are the advantages of a random access in a wireless IoT context? What are the shortcomings? |
- | * What type of mathematical model enables to theoretically compute | + | </ |
+ | |||
+ | Suppose that the packet length is 50 bytes. | ||
+ | |||
+ | <WRAP center round help 100%> | ||
+ | * What is the maximum packet generation rate for each spreading factor (SF7 to SF12)? Explain your answer. | ||
+ | </ | ||
+ | |||
+ | In the following we consider N devices transmitting 50 bytes packets using SF7. The packet generation rate is assumed to be equal to the maximum possible rate given the duty cycle limitation. | ||
+ | |||
+ | <WRAP center round help 100%> | ||
+ | * Compute the number of successful transmissions per hour for 50, 100, and 200 devices respectively. Comment the obtained results. | ||
+ | * Plot the number of successful transmissions per hour as a function of the number of devices for SF7 and SF12. Analyse the obtained figure and attach the simulation code. | ||
+ | * Plot the packet delivery ratio as a function of the number of devices for different SFs. Give the details of your computation and the simulation code. | ||
+ | * Plot the number of successful transmissions per hour per device as a function | ||
</ | </ | ||
===== - Coverage Challenge ===== | ===== - Coverage Challenge ===== |
exploring_lora.txt · Last modified: 2021/10/20 12:52 by samer