Pre-Internship Notes by Rifqi Farhansyah
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###### tags: `Internship`

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##### [<center>Root Page</center>](https://hackmd.io/UvKmuVbFSr-DxyG4bV6zow)
>Name : Mohammad Rifqi Farhansyah
>Department : School of Electrical Engineering and Informatics
>University : Institut Teknologi Bandung
>General Topic : Random Access
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## I. WiFi 6 (IEEE 802.11ax)
> **Week 1:** (27/01/2022-03/02/2022)

#### Resources:
>* [Scheduling and Resource Allocation in 802.11ax](https://ieeexplore.ieee.org/document/8486204)
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#### Study Notes:
- Background Knowledge [(29/01/2022)](https://hackmd.io/VYxzZMggRfKOhD6pC4svdw?view)
- Relaxed & Original Scheduling and Resource Allocation (SRA) Problem [(29/01/2022)](https://hackmd.io/y4P1Pio0SuWYSBb5Sk0LHA?view)
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:::success
#### Goals
- [x] Find the most effective & efficient (in terms of the sum rate) ways to manage and allocate the resources for optimally utilizing the available bandwith
- [x] Maximize the user sum rate in the context of 802.11ax by assigning users and user group to subcarries

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**What I have learned**
- It is proved that the relaxed SRA problem can be solved optimally by a divide and conquer based algorithm.
- The original SRA problem, can only be solved optimally by exhaustive search which is computationally expensive.
- The recursive scheduling algorithm yields a sum rate which is very close to the optimal.
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## II. Slotted ALOHA
> **Week 2:** (14/04/2022-21/04/2022)

#### Resources:
>* [Medium Access Method](https://www.generalnote.com/Computer-Network/Medium-Access-Methods/Slotted-ALOHA.php)
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#### Study Notes:
- Background Knowledge [(17/04/2022)](https://hackmd.io/fbCbgFEgSLSt11YnQx8g1w)
- Pure and Slotted ALOHA[(17/04/2002)](https://hackmd.io/pMGyKN_DTJqvk8dDpsHblg)
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#### Goals
- [x] Create a simulation of Slotted or Multichannel Slotted Aloha
- [x] Derive the collision and success probability of ALOHA and slotted ALOHA
- [x] Verify your results using the analytical formula you derived and the simulation results

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**What I have learned**
- Gain deeper background knowledge about Medium Access Methods, ALOHA, and Slotted and Multichannel Slotted Aloha.
- Gain deeper background knowledge about Medium Access Methods, ALOHA, and Slotted and Multichannel Slotted Aloha.
- Understand the detailed operation of ALOHA protocols
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## III. CSMA Random Access Protocol
> **Week 3:** (22/07/2022-29/07/2022)

#### Resources:
>* [Carrier Sense Multiple Access](https://electronicsdesk.com/carrier-sense-multiple-access.html)
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#### Study Notes:
- Background Knowledge [(22/07/2022)](https://hackmd.io/ezNEtcNFSNaE6hXym7nRIg)
- CSMA in Detail[(22/07/2002)](https://hackmd.io/pMGyKN_DTJqvk8dDpsHblg)
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