# IVC 5G O-RAN Summary

###### tags: `UNILA`

## 26th of July 2021

Nama : Dimas Danu Saputra
NPM : 1915031076

Summary “Baseband Technology : 5G NR Physical Layer Design”

5G targets three main use cases with distinct connectivity requirements :
1. Enhanced mobile broadband (eMBB),
2. Massive machine type communications (mMTC) and
3. Ultra-reliable low latency communications (URLLC)➢ also called as critical machine type communications (cMTC)

# 5G Targets
* eMBB
* mMTC
* cMTC

- The key technology components of the NR physical layer are:
1. Waveform
2. modulation
3. Multiantenna transmission (MIMO)
4. Channel coding

# 5G NR Terminologies
* Subcarrier Spacing,
* Frame-Subframe,
* Slot and
* Symbol

# Transform Precoding
Transform Precoding is to spread UL data in a special way to reduce PAPR(Peak-to-Average Power Ratio) of the waveform. In terms of mathematics, Transform Precoding is just a form of DFT (Digital Fourier Transform)
Multi Antenna Transmission
* Multiple-input/multiple-out (MIMO) technology is an established wireless communications technique for sending and receiving multiple data signals simultaneously over the same radio channel.
* MIMO techniques play a prominent role in Wi-Fi communications, as well as 3G,4G, and 4G LTE networks.

# How does MIMO work ?
* MIMO takes advantage of multi-path.
* MIMO uses multiple antennas to send multiple parallel signals (from transmitter).

# MIMO in 5G
* Massive MIMO is the extension of traditional MIMO technology to antenna arrays having a large number
* Transmission signals from the antennas are adaptable by the physical layer via gain or phase control

## Mimo Summary