DM-RS vs SRS in 5G

[ Interview QnA ] DM-RS vs SRS | Why do we need SRS when DMRS is already present?
DM-RS - Demodulation Reference Signals
SRS - Sounding Reference Signals
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[@request_scudling]

DMRS Digital Modulation Reference Signal !!! i think Demodulated Reference Signal

[@Uttama_Shikshana]

Yes. Thanks for feedback. While explaining in fast, I told like that. It is mentioned rightly in the description box and also at later stage of the video, it is told correctly.

[@awais1553]

Good explanation, Can you pls briefly explain how SRS wideband and SRS narrow band works and what was the benefit / reason of switching between above 2

[@awais1553]

SRS usually transmitted in Gap symbols

[@nitsr6053]

Sir how is Fujitsu company for 5g physical layer

[@Uttama_Shikshana]

Sorry, I am not aware. Anybody knows ? Please comment. Thanks

[@VipinKumar-dv7hy]

Fujitsu is big giant in Japan telecom....very big company in telecom

[@venkateshthalluri1026]

Hi Sir Can you tell why SRS is scheduled only on last 6 symbols is there any reason behind it ?? As you mentioned SRS will be used for MIMO i.e., SRS will be sent over 2ports and check channel for LI --> like these CSIRS also be transmitted over 2ports to check MIMO in DL ??

[@Uttama_Shikshana]

1st question is left for others to comment. 2nd question - Yes. You are right.

[@VipinKumar-dv7hy]

@@Uttama_Shikshana one question here if we have mumimo then can't we do 1T 4R anttena switching srs..as per above description it's shows that mumimo required 2 port srs that means 2 TX correct???

[@pankajagrawal3925]

Hey, Can you tell the reason why SRS send on last symbol and also why we need csi rs

[@Uttama_Shikshana]

If nobody answers in the near future then I will try to bring the answers. Thanks

[@gummadiramyasree2683]

​@@Uttama_Shikshanaplease provide answer for this

[@sandeepsunny8894]

@@Uttama_Shikshana Because SRS is used for estimating channel in UL, and channel reciprocity is then used to apply those coefficients in DL. And in case of high mobility channel will change quickly. Sending SRS in last will make sure that there is minimal gap between time of channel estimation and applying it in DL.

[@VipinKumar-dv7hy]

It's not digital it's demodulation

[@Uttama_Shikshana]

Yes. Thanks 😊