# Daily Report 6 :::success ### Task 6 ## 26th of July 2021 :::info **Baseband Technology** To realize the vision of 5G vision, the PHY system is designed and it is referred as New Radio. The key technology components of the NR physical layer are : # 1. Waveform ![](https://i.imgur.com/V5E9wES.png) # 2. Modulation 5G still use OFDM-based modulation as in TE such as OFDMA, CP-OFDMA, and SC-FDMA. ![](https://i.imgur.com/uDxsA4n.png) # 3. Multiantenna transmission (MIMO) ![](https://i.imgur.com/9NBfHrb.png) How does MIMO work? - MIMO takes advantage of multi-path - MIMO uses multiple antennas to send multiple parallel signals (from transmitter) Why do we need Massive MIMO? - Capacity requirements - Coverage requirements - Technology capability - 3GPP spec support # 4. Channel coding ![](https://i.imgur.com/8uycZca.png) There are 2 type of polar code : - CRC-concatenated polar codes (CA-Polar Code) with single-parity-check code concatenation and multi CRC-concatenation - Parity-check concatenated polar code (PC-Polar Code)