OFDM in 5G NR

This is 12th video in the series of course on OFDM and Signal Processing for 5G NR. OFDM is a backbone of modern communication technologies like 5G NR. This video explains an overview of OFDM in 5G NR. It talks about number of Resource blocks from 3GPP specifications.
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[@harry_kim6940]

2023.07.23 감사합니다.

[@arjhai1572]

Hi, can you help me on this.
why CP length of first OFDM symbol is more than the rest of OFDM symbol in each half of each subframe.?
please refer the spec 5.3.1 38.211

[@curiousbeing8585]

One simple explanation is: To make the length of every half subframe equal to 0.5ms. Try keeping CP of all symbols same, then you can't get half subframe length equal to 0.5ms.

[@hatemodet131]

@@curiousbeing8585 in other words to accommodate the excess samples that can exist each half subframe

[@Heavygunner1]

Can you please help to know what modulation technique used in uplink. Scfdma or ofdma

[@curiousbeing8585]

Uplink in NR has two options: 1. OFDMA 2. DFTsOFDM