for phase noise ,wider subcarrier spacing in time and not in frequency ! ,when subcarriers are spaced in time the phase noise becomes less ! bcs when we increase subcarrier spacing for example using 120khz SCS the phase noise is more than using 60khz SCS
I am not 100% sure about fixing number of symbols per slots as 14, but I think as scheduling in NR is on slot level, therefore for faster scheduling we use wider sub carrier spacing and hence lesser symbol duration which leads to lesser slot size hence faster scheduling.
Regarding relation of SCS and cell size : In an OFDM system, cyclic-prefix is chosen larger than delay spread to avoid inter-symbol interference and complex equalization. This means that for a given cyclic-prefix overhead, the channel delay spread sets a lower limit on subcarrier spacing. Typically, the delay spread reduces with cell-size as does the required cyclic-prefix duration, meaning that wider subcarrier spacings (having shorter cyclic-prefix) are more suitable for deployments with smaller cell-size. This is in parallel with the fact that smaller cell sizes are envisioned at higher carrier frequencies due to harsh propagation characteristics, and wider subcarrier spacing makes the system robust to phase noise (which increases with oscillator frequency). This is described here in the video ruclips.net/video/RagHojSWEz8/видео.html
Basically in NR, One Resource Block is more associated with 12 Subcarriers in frequency domain provided in time domain the minimum number of symbols include DMRS symbol
Different numerologies differ in SubCarrier Spacings in frequency domain view that's how they are defined, but they are similar if you look in time domain
Thanks, though the explanation of why we use multiple numerology in NR was very high level and vague, wish you had explained with diagrams rather than bbullet points on black slides!
If 15 kHz subcarrier = slot per subframe is 1 slot = 1 ms = 14 OFDM symbol, then 30 kHz subcarrier = slot per subframe is 2 slots = 1 ms = 28 OFDM symbol, and for 60 kHz subcarrier = slot per subframe, it is 4 slots = 1 ms = 56 OFDM symbol. Now, my question is this: 1. How much bandwidth contains in each slot, for 15 kHz, 30 kHz, and 60 kHz? 2. How much bandwidth contains in 1 OFDM symbol
Nice one, hopefully you will make more of them 👍
Thanks, More videos on further topics are in the pipeline
Nice, informative Keep it up👍
for phase noise ,wider subcarrier spacing in time and not in frequency ! ,when subcarriers are spaced in time the phase noise becomes less !
bcs when we increase subcarrier spacing for example using 120khz SCS the phase noise is more than using 60khz SCS
Thanks for the series .. Is there a reason for fixing number of symbols per slot as 14 ? What is the relation of SCS and cell size?
I am not 100% sure about fixing number of symbols per slots as 14, but I think as scheduling in NR is on slot level, therefore for faster scheduling we use wider sub carrier spacing and hence lesser symbol duration which leads to lesser slot size hence faster scheduling.
Regarding relation of SCS and cell size :
In an OFDM system, cyclic-prefix is chosen larger than delay spread to avoid inter-symbol interference and complex equalization. This means that for a given cyclic-prefix overhead, the channel delay spread sets a lower limit on subcarrier spacing. Typically, the delay spread reduces with cell-size as does the required cyclic-prefix duration, meaning that wider subcarrier spacings (having shorter cyclic-prefix) are more suitable for deployments with smaller cell-size. This is in parallel with the fact that smaller cell sizes are envisioned at higher carrier frequencies due to harsh propagation characteristics, and wider subcarrier spacing makes the system robust to phase noise (which increases with oscillator frequency).
This is described here in the video ruclips.net/video/RagHojSWEz8/видео.html
Really great sir.. very useful content. Please continue sir. Next also do the videos on heterogeneous networks sir
Thank you so much sir
Thanks a lot for appreciation. Please subscribe to the channel for more videos and share with your friends and colleagues to increase 5G knowledge.
How about the Resource block definition in 5G and how different numerology is implement in one carrier from frequency and time domain view?
Basically in NR, One Resource Block is more associated with 12 Subcarriers in frequency domain provided in time domain the minimum number of symbols include DMRS symbol
Different numerologies differ in SubCarrier Spacings in frequency domain view that's how they are defined, but they are similar if you look in time domain
@@curiousbeing8585 Thanks a lot for the explanation. I also figured out the same after I sent the question.
Thanks, though the explanation of why we use multiple numerology in NR was very high level and vague, wish you had explained with diagrams rather than bbullet points on black slides!
Please checkout ruclips.net/video/IqthZvYNKK4/видео.html , to understand more about numerology in 5G NR
Can you please point to 5G layer 1 specification
3GPP 38 Series. 38.211 is for NR Physical channels and modulation
@@curiousbeing8585 Thank you for the information
I am doing research on GFDM sir. It is useful for future communications sir. Please give me a reply sir
It's always good to learn a new technology. GFDM is also a possible NR waveform candidate.
I am doing research in FBMC Sir. Is it having scope in 5G sir? Please reply.
Thank you
Could you please elaborate on Why EP only for 60 KHZ SCS ?
this is just application based, in LTE not much use cases were found for extended CP, therefore in NR extended CP is limited to only one SCS.
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Nice sir
There are sudden noise in many places like 8:45 etc, be careful else you will hurt your ears
If 15 kHz subcarrier = slot per subframe is 1 slot = 1 ms = 14 OFDM symbol, then 30 kHz subcarrier = slot per subframe is 2 slots = 1 ms = 28 OFDM symbol, and for 60 kHz subcarrier = slot per subframe, it is 4 slots = 1 ms = 56 OFDM symbol.
Now, my question is this:
1. How much bandwidth contains in each slot, for 15 kHz, 30 kHz, and 60 kHz?
2. How much bandwidth contains in 1 OFDM symbol