For 5G topics discussed in 5G Job Interviews, check out the complete playlist below :) 🌐5G Interview Topics 💡ruclips.net/p/PL4OXTttOk9WiLsz4fR62lpPcT3Wx3l5OP
I like how you have simplified a complex topic. I spent one month trying to understand how beamforming works but with your explanation, I did understand in less than 1hour. Thank you very much.
The narrator explained the basic concepts in a way that that I was able to understand everything he said. The drawings help too. I then watched a few of his other wireless videos. All good.
One of the best videos on MIMO. Very nicely explained !! . just a little confusion, with multi user mimo and beamforming why we can use same RBs - same frequency domain- within different uEs when we use different beams index .. why we can use same RBs for different uEs? I mean at basestation - gNB , lets say there's 100Mhz bandwidth so 273 rbs , lets assume same 100rbs allocated for uE1 in certain beam and the same 100rbs allocated to uE2 in another beam , but at the end the cell has the same 100 rbs so doesn't matter the beam index , if we use same rbs within different uEs there will be interferences and overwritten data since different uEs uses same rbs ..but from cell view those are same rbs doesn't matter which beam index is .. can you please clarify more why when we use different beam indexes then we can transmit same amount of rbs for paired uEs in different beams? .. if beam index is affecting so I can say in massive mimo and beamforming at each beam index .. I have for each beam all the bandwidth?! Im confused on that point how the cell bandwidth for each beam is shared like each beam has full cell bandwidth? thanks for your clarification.
You can say like each beam can use the full bandwidth but to reduce interference between UEs, only a limited number of UEs can be paired and that pairing can only happen for UEs that are separated in space (so that they have beam separation as well).
Ali, great video. Please cover another video to explain csi-rs ports, codebook configuration and its implication on number of beams, types of beams (SSB based, PMI based or SRS based), beam refinement, mobility between beams on same cell, what is TCI and how are beams changed based on TCI etc And more likely don't use general pictures, Make snapshots from TEMS or ACTIX or other tools to teach all users where they can find those parameters and what each one means.Thanks a lot for all your work, great video you will grab lot of traffic
Thank you very much for such an informative video. I have a question related to 'How to choose the beam' section. In this video, CSI feedback from the UE is used to tell the gNB about the best beam. However, during initial access isn't SSB used for beam sweeping purpose and select the best beam in terms of coverage? CSI feedback will come only after the initial access is successful and DL data scheduling is to be done by gNB. The beam related precoding will then be fine-tuned based on CSI feedback right ? Please correct me if I am wrong.
During initial access, the SSB beam is used. And after that, the CSI based beams are used for all traffic relation transfers. This session is focused on traffic or data beam forming. For SSB beam forming, kindly take a look at this session ruclips.net/video/MAJSLFbpgv8/видео.html
Great video! Thanks for the information. I have a question on the PMI. The explanation of i1 and i2 is very clear. In type 2 codebooks, I see amplitude factor also comes into play and beam groups are selected instead of single beam. Can you please give a brief about it.
Thanks for your nice presentation making massive MIMO so easy to understand. I never heard CSI-IM though (only CSI-RS). Would google it. By the way, expecting to your next session you mentioned. I can't find it. Have you posted it? Thanks!
Great explanation Ali ! You again provide us to understand of one of the most complex topics.Could you add your explanations with snapshots from TEMS or ACTIX (or other tools) to teach all users where they can find those parameters and what each one means? Thanks a lot for all your work
Thanks for a impressive presentation , i just get bit confuse on the concept of beamforming vs Antenna elements i.e 64T64 ( 64 Antenna elements in DL/UL ) meaning 16 4x 4 MIMO groups with the help of massive MIMO, so in this case , is Antenna is transmitting 64 Beams ?
In the current market, this is more of an implementation specific thing. But usually 16 beams at the same time are the upper limit as increasing it more than this causes too much interference
@@OurTechPlanet Ok but currently all new 5G modules are coming with 64T64R , it means they supposed to support 16 X ( 4x4) MIMO users simultaneously. However if upper limitation of beams is 16 as you mentioned, is it means these 64T64R are actually working like 16T16R?
If CSI-RS 32 ports is used the gNB will transmit 32 signals to the Ue, which in turn applies PMIs to all of these 32 signals for SINR calculation.Is it correct? Thank you
Firstly mant many thanks for so much for your valuable videos about 5G.I have several questions about MMIMO effect and link budget.How can I put a MMIMO effect in Link budget formula different than RRU effect.Another Question for Beamforming effect also.How can ı calculation cell radius depend on cell edge throguhput ? Can ı used SINR table vice versa DL/UL speed ?
MMIMO gains in Link Budget are usually added via beamforming gains in dBs The Cell radius vs cell edge throughput actually comes from the SINR estimation and the SINR table can be acquired using empirical means or simulations
Hi Ali, Thanks for video! I have on question about mimo: I don't fully understand how MIMO improves capacity, because in my current understanding capacity is how much PRB we have. But I understand that MIMO improves spectral efficiency(since we can transmit more bits), but it doesn't add PRBs for us, so how can it improve capacity?
In simple words, with 1x1 system (SISO), if we have 100 PRBs, then the system can send data on those 100 PRBs. However , if we have 2x2 system (MIMO) then the system can send data-1 on first Tx path using 100 PRBs and it can send data-2 on the second Tx using 100 PRBs again. So, it doubles the capacity. The implementation is not as simple as the multiplexing is done on both tx paths but simply put that is how it increases capacity.
The antenna directivity is controlled by two modules; precoder and beam forming. You mentioned PMI is used to decide beam for a given UE. That is ok at precoder module level but how then the UE beam is further enhanced at beamforming module.
Thank you , one question which often confuses me, so like you said , 32T32R Theoretically will give 8X 4t4R capacity gain , if its so, how many DL MIMO layer will be transmitted from 32T32R , apparently it should be 32 layers which is not the case in practical , Can you please explain this ?
For Single user, 32T32R or 64T64R, the maximum DL layers supported by a single UE right now are 4. So, the capacity of single UE does not increase. However, these higher Tx antenna units provide better gain and beamforming capabilities which can improve the overall capacity by increasing the quality. But if we talk about multiple users then these higher Tx antennas support MU-MIMO which can increase cell capacity.
@@OurTechPlanet So basically from capacity perspective , MM is nothing without MU-MM where same resources will be used by two users situated orthogonally with each others.
The mathematics are complex but you can read about this in 3GPP 38214 under 5.2.2.2. Mainly, i11 tells about azimuth angle while i12 indicates about elevation angle and i13 talks about layers.
You said in MU MIMO pairing blue & green UE are using same freq & time domain resources but with the diff beam, here my queries are 1) same time domain mean they got scheduled in the same TTI? 2) if Blue and green UE are using different beams in MU MIMO but what about in SU MIMO case, beamforming will be applicable for that also right, and can they still be having different beams?
Nice and easy lecture...but still so many confusion for example we are using 12×8×2 antenna but its called 64t64r how it called 64t64r in practical its have 192 elements and another thing how many beams it can generate how do i know ..another antenna also we have 8×8×2 or 4×8×2 its also 64t64r how do we calculate this
Great explanation!!! Now I have one doubt about i11 and i12. I read that PMI carries Precoding components that help to maximize the orthogonality of the signals that arrives at each receiver antenna port. So, what's the relation between i11, i12 and the Precoding components?
Hi, Multiple beams can be form based on user location or may be beam location are fixed which can be assigned to user considering SINR as you mentionee in the video. But are these beams form one at a time or they are formed together? These massive MIMO work with multiple beam antenna system or just 1 beam using massive array addressing different user in some sequence? Kindly help me understand this to make me clearly think about antenna development. Thanks
Hello Sir, Definition of the concept of ERB coverage area (gNodeB) when using narrow beam pointing generated by MIMO antenna in beamforming (BF) mode: Pointing a narrow beam covers, at maximum gain (up to 3 dB below), a relatively small area around the UE reference point (or UE cluster). How, therefore, is the concept of the coverage area of an ERB, and its correlate, the percentage of coverage area (a statistical parameter that considers the effect of log-normal multipath shading and weights its effects in an area around the ERB)? When considering the multi-user MIMO mode, with multiple narrow beams... The coverage area of an ERB would be defined considering all the beams pointed at different points in the surrounding area, or for each beam, is an area or sub-area of coverage defined? In the previous question, the starting point of view was what happens in the vertical plane that contains the ERB and UE antennas. There is also a concern with what happens in the signal distribution in the horizontal plane. In previous generations, a fundamental related concept is the division of the coverage area by sectors, something that was directly related to the beamwidth of the ERB antennas. For example, using 120º beam antennas, 3 antennas covered the 360º that would characterize the entire area. With multiple beams, one can imagine maintaining this concept and expanding the number of sectors. For example, with widths of 10 degrees per beam, horizontally, 36 would be needed to cover the entire area. From the above, I ask: the concept of the coverage sector remains in 5G, adapted to the multiple beams of the antennas MIMO? Given the considerable (apparently) change in planning: do the concepts of coverage area and percentage of coverage area remain essential for planning? What other related concepts came to be used? On 4G, are they already used? Given the complexity of using and coordinating multiple beams: in which scenarios and application conditions, will the MIMO strategy with multiple beams be used? The macro scenario is extreme broadband, communication ultra-reliable, or massive communication for multiple users? Is the environment outdoors, indoors, or both? Is the band sub-6 GHz or millimeter wave? Still on the previous question, in the scenarios foreseen for using MIMO with multiple beams, another question arises. In which of these beamforming scenarios will be “fixed” and in which will it be adaptive (following cluster of users, with or without the interposition of nulls of the radiation pattern in the directions of other groups considered interference for that cluster)? Finally, considering all the different aspects of previous generations brought by the multi-user (multibeam) MIMO approach of 5G discussed here…. How has the link budget analysis been (or needs to be) adapted to address these aspects? Best Regards!
Best video. Very intuitive. Mimo simplified. Subscribed. Shall see all videos inshallah. One simple question. What is the reason base station is called eNodeB?
First Thanks u sir 🙏 Secondly please tell me how 2 user can use same through put at the same time Why they didn't share 80% (40% for UE1 & 40% UE2) I want te know how they takes advantage of throughput because it is limited to frequencies? 23:40
Yeah, in a simplified manner, it is correct that the beams are allocated on 2d space if we consider type1 codebooks. But more on this will be shared on the next Massive MIMO video :)
I request videos on Modulation and multiple access techniques for wireless . Drawbacks of cdma and benifits of ofdma , Why DL-ofdma and UL- SC fdma. I did ms research in pattern recognition and image processing. For PhD I was asked to change my domain. I am strugggling for that. Your explanation is very clear. Looking forward for basic topics..
This is more of a vendor implementation based thing but for a given PMI, a corresponding beam should be fixed. And the gap between beams depends on number of beams (number of csi-rs ports or SRS implementation). Generally, Higher CSI-RS ports, will have more beams and lower gap between beams.
For 5G topics discussed in 5G Job Interviews, check out the complete playlist below :)
🌐5G Interview Topics
💡ruclips.net/p/PL4OXTttOk9WiLsz4fR62lpPcT3Wx3l5OP
I like how you have simplified a complex topic. I spent one month trying to understand how beamforming works but with your explanation, I did understand in less than 1hour. Thank you very much.
You Sir, just made my day. Thanks for the comment :)
The narrator explained the basic concepts in a way that that I was able to understand everything he said. The drawings help too. I then watched a few of his other wireless videos. All good.
Great to hear this :)
One of the best videos on MIMO. Very nicely explained..
So happy to get such good feedback :)
This was very Positive. Thank you!
Great to hear, thanks mate.
One of the best videos on MIMO. Very nicely explained !! . just a little confusion, with multi user mimo and beamforming why we can use same RBs - same frequency domain- within different uEs when we use different beams index .. why we can use same RBs for different uEs? I mean at basestation - gNB , lets say there's 100Mhz bandwidth so 273 rbs , lets assume same 100rbs allocated for uE1 in certain beam and the same 100rbs allocated to uE2 in another beam , but at the end the cell has the same 100 rbs so doesn't matter the beam index , if we use same rbs within different uEs there will be interferences and overwritten data since different uEs uses same rbs ..but from cell view those are same rbs doesn't matter which beam index is .. can you please clarify more why when we use different beam indexes then we can transmit same amount of rbs for paired uEs in different beams? .. if beam index is affecting so I can say in massive mimo and beamforming at each beam index .. I have for each beam all the bandwidth?! Im confused on that point how the cell bandwidth for each beam is shared like each beam has full cell bandwidth? thanks for your clarification.
You can say like each beam can use the full bandwidth but to reduce interference between UEs, only a limited number of UEs can be paired and that pairing can only happen for UEs that are separated in space (so that they have beam separation as well).
Amazing video, can not wait for second video of Massive MIMO. Love love.
Thanks. Coming soon!
Great explanation Ali! Very easy to understand the basic concepts behind this advance technique. Thanks for sharing!!
Thanks Marcos! Glad to hear that the session was able to simplify this advanced concept!
I really appreciate the way you explained such a complex topic in a short plain language. Well done
Now am your big fan , what an explanation with visuals ,complex topics in simple and clear manner. thanks for your work.
That is great to hear! Thanks. Do help us spread the word around :)
Fantastic.... Fantastic... Fantastic...
Great to see such a Fantastic response :)
Very informative, thanks for sharing!!! pls let us know difference between 4G Massive MIMO and 5G massive MIMO
Thanks! Will create something on that topic soon!
What a superb video on Massive MIMO!!! Excellent job and thanks a lot for sharing this knowledge with us :-)
Thanks Soham! :)
Awesome video on MIMO and Beamforming. It was very easy to comprehend. Thankyou for this wonderful video.
Thanks Pragathi :)
Ali, great video. Please cover another video to explain csi-rs ports, codebook configuration and its implication on number of beams, types of beams (SSB based, PMI based or SRS based), beam refinement, mobility between beams on same cell, what is TCI and how are beams changed based on TCI etc And more likely don't use general pictures, Make snapshots from TEMS or ACTIX or other tools to teach all users where they can find those parameters and what each one means.Thanks a lot for all your work, great video you will grab lot of traffic
Thanks for your feedback. Will try to address these topics in the future sessions!
REALLY awesome training brother... its more easily understandable ...thanks
That is so nice to hear :)
Thank you very much for such an informative video. I have a question related to 'How to choose the beam' section. In this video, CSI feedback from the UE is used to tell the gNB about the best beam. However, during initial access isn't SSB used for beam sweeping purpose and select the best beam in terms of coverage? CSI feedback will come only after the initial access is successful and DL data scheduling is to be done by gNB. The beam related precoding will then be fine-tuned based on CSI feedback right ? Please correct me if I am wrong.
During initial access, the SSB beam is used. And after that, the CSI based beams are used for all traffic relation transfers. This session is focused on traffic or data beam forming. For SSB beam forming, kindly take a look at this session
ruclips.net/video/MAJSLFbpgv8/видео.html
I like how you have simplified a complex topic. Keep up the good work.
Thanks!
Perfect videos. can you please explain a little about PRB and digitally beam forming and beam and null steering??. very much appreciated.
Coming Soon!
@@OurTechPlanet perfect thank you, you are awesome and very responsible
Really simple but very comprehensive presentation, thank you for all your efforts and help.
Thank you so much. This is what I strive for, to simplify complicated topics for everyone :)
Very informative ..I worked on these topics..found your video very accurate and at the same explained all the concepts clearly.
Great to hear that :)
Great video! Thanks for the information.
I have a question on the PMI. The explanation of i1 and i2 is very clear. In type 2 codebooks, I see amplitude factor also comes into play and beam groups are selected instead of single beam. Can you please give a brief about it.
Yeah Type-2 is a different ball game. I will create a session soon to cover that as well!
Best video on MIMO & mMIMO. Thank you!
Thanks :)
Great explanation, now Massive MIMO comes more closer to my head :) thank you very much !!
This is great to hear because this is exactly what we strive to do - simplify complex topics :)
Thanks for your nice presentation making massive MIMO so easy to understand. I never heard CSI-IM though (only CSI-RS). Would google it. By the way, expecting to your next session you mentioned. I can't find it. Have you posted it? Thanks!
Thanks. Next session is still a work in progress :)
Thanks for such a class Vedio.Only one question from my side what is limitation for Multi User MIMO?Is any license required?how we can implement it?
From vendor implementation perspective, yes licenses are usually required for such features.
Thanks for sharing a great explanatory video!, waiting for next video on the topic
You are welcome. Stay Tuned! :)
Great explanation Ali ! You again provide us to understand of one of the most complex topics.Could you add your explanations with snapshots from TEMS or ACTIX (or other tools) to teach all users where they can find those parameters and what each one means? Thanks a lot for all your work
Noted :)
One of the best explanations of Massive MIMO out there. Waiting for the next session!
Glad you liked it! Stay Tuned!
Great explanation and alleviates some mis understandings in Massive MIMO. Great work work ! indeed.
So nice of you. Thanks. Glad that you liked it! Do help us to spread the word!
Excellent upload on Massive MIMO, really helpful. Thanks for posting this :)
Glad you enjoyed it!
Thanks for a impressive presentation , i just get bit confuse on the concept of beamforming vs Antenna elements i.e 64T64 ( 64 Antenna elements in DL/UL ) meaning 16 4x 4 MIMO groups with the help of massive MIMO, so in this case , is Antenna is transmitting 64 Beams ?
In the current market, this is more of an implementation specific thing. But usually 16 beams at the same time are the upper limit as increasing it more than this causes too much interference
@@OurTechPlanet Ok but currently all new 5G modules are coming with 64T64R , it means they supposed to support 16 X ( 4x4) MIMO users simultaneously. However if upper limitation of beams is 16 as you mentioned, is it means these 64T64R are actually working like 16T16R?
Very helpful info. 2 UEs in connected mode, placed next to each other, will report the same pmi feedback and share the same traffic beams. Correct ?
Yes, that should be correct.
If CSI-RS 32 ports is used the gNB will transmit 32 signals to the Ue, which in turn applies PMIs to all of these 32 signals for SINR calculation.Is it correct? Thank you
Thank you and great explanation! This topic is beautiful.
Good to hear that! You are welcome! :)
Firstly mant many thanks for so much for your valuable videos about 5G.I have several questions about MMIMO effect and link budget.How can I put a MMIMO effect in Link budget formula different than RRU effect.Another Question for Beamforming effect also.How can ı calculation cell radius depend on cell edge throguhput ? Can ı used SINR table vice versa DL/UL speed ?
MMIMO gains in Link Budget are usually added via beamforming gains in dBs
The Cell radius vs cell edge throughput actually comes from the SINR estimation and the SINR table can be acquired using empirical means or simulations
Very good explanation of Massive MIMO. Plz upload more videos on 5G
Thanks Amirzeb! Stay tuned, more videos coming in May.
Hi Ali, Thanks for video! I have on question about mimo: I don't fully understand how MIMO improves capacity, because in my current understanding capacity is how much PRB we have. But I understand that MIMO improves spectral efficiency(since we can transmit more bits), but it doesn't add PRBs for us, so how can it improve capacity?
In simple words, with 1x1 system (SISO), if we have 100 PRBs, then the system can send data on those 100 PRBs. However , if we have 2x2 system (MIMO) then the system can send data-1 on first Tx path using 100 PRBs and it can send data-2 on the second Tx using 100 PRBs again. So, it doubles the capacity.
The implementation is not as simple as the multiplexing is done on both tx paths but simply put that is how it increases capacity.
The antenna directivity is controlled by two modules; precoder and beam forming. You mentioned PMI is used to decide beam for a given UE. That is ok at precoder module level but how then the UE beam is further enhanced at beamforming module.
Thank you , one question which often confuses me, so like you said , 32T32R Theoretically will give 8X 4t4R capacity gain , if its so, how many DL MIMO layer will be transmitted from 32T32R , apparently it should be 32 layers which is not the case in practical , Can you please explain this ?
For Single user, 32T32R or 64T64R, the maximum DL layers supported by a single UE right now are 4. So, the capacity of single UE does not increase. However, these higher Tx antenna units provide better gain and beamforming capabilities which can improve the overall capacity by increasing the quality.
But if we talk about multiple users then these higher Tx antennas support MU-MIMO which can increase cell capacity.
@@OurTechPlanet So basically from capacity perspective , MM is nothing without MU-MM where same resources will be used by two users situated orthogonally with each others.
Thank you for this explanation.
How can I get the video presentation so one can add their own description and write their notes on the presentation?
Thanks Serwan. Currently we are not sharing the presentation material itself :)
great video but how is the I11 AND i12 are linked to certain beam? or they just represent like the coordinates?
The mathematics are complex but you can read about this in 3GPP 38214 under 5.2.2.2. Mainly, i11 tells about azimuth angle while i12 indicates about elevation angle and i13 talks about layers.
Thanks you.. explanation too good . easy to understand. keep posting more videos
Great to hear this. Thanks!
Nice presentation ..thanks 👍👍but some confusion on 64 × 64 antenna elements ,Is it 4 beams restricted for a user ?
Yes, in a way, because current UE implementations have only 4 Rx paths so in the end they can only have 4 layers.
You said in MU MIMO pairing blue & green UE are using same freq & time domain resources but with the diff beam, here my queries are
1) same time domain mean they got scheduled in the same TTI?
2) if Blue and green UE are using different beams in MU MIMO but what about in SU MIMO case, beamforming will be applicable for that also right, and can they still be having different beams?
1. yes
2. they will have different time/frequency domain allocation in SU-MIMO
Great Job Ali. Very explicit
Thanks :)
Wow ..what a explanation....it's easy to understand...easy language...
That is great to hear as that is what we strive to do :)
Hello Team, could you please make a video on 'Role of SSB in Beam Sweeping'. I need clarity on the process which is taking place at the background.
Sure, will add that to the list!
Very good video MIMO & Beam Forming well explained
Thanks Claret :)
So the number of transmitters and receiver is MIMO and beamforming depends on antenna elements, right ?
Yes, correct.
Thanks, it was very helpful with the simple explanation
Glad it was helpful!
Nice and easy lecture...but still so many confusion for example we are using 12×8×2 antenna but its called 64t64r how it called 64t64r in practical its have 192 elements and another thing how many beams it can generate how do i know ..another antenna also we have 8×8×2 or 4×8×2 its also 64t64r how do we calculate this
Thanks. All this will be covered in the next Massive MIMO session :)
Great explanation!!! Now I have one doubt about i11 and i12. I read that PMI carries Precoding components that help to maximize the orthogonality of the signals that arrives at each receiver antenna port. So, what's the relation between i11, i12 and the Precoding components?
i11 and i12 are part of those components that you are referring to :)
Better than paid instructors in the industry. 👏
That means a lot! Thanks!
Hi,
Multiple beams can be form based on user location or may be beam location are fixed which can be assigned to user considering SINR as you mentionee in the video. But are these beams form one at a time or they are formed together? These massive MIMO work with multiple beam antenna system or just 1 beam using massive array addressing different user in some sequence?
Kindly help me understand this to make me clearly think about antenna development. Thanks
Within the same TTI, multiple users can be allocated different beams
Excellent & Simple presentation for everyone to understand.
Thanks Irshad :)
Love this video! Very nice explanation, thank you very much for doing this.
Glad it was helpful!
Hello Sir,
Definition of the concept of ERB coverage area (gNodeB) when using narrow beam pointing generated by MIMO antenna in beamforming (BF) mode: Pointing a narrow beam covers, at maximum gain (up to 3 dB below), a relatively small area around the UE reference point (or UE cluster). How, therefore, is the concept of the coverage area of an ERB, and its correlate, the percentage of coverage area (a statistical parameter that considers the effect of log-normal multipath shading and weights its effects in an area around the ERB)?
When considering the multi-user MIMO mode, with multiple narrow beams... The coverage area of an ERB would be defined considering all the beams pointed at different points in the surrounding area, or for each beam, is an area or sub-area of coverage defined?
In the previous question, the starting point of view was what happens in the vertical plane that contains the ERB and UE antennas. There is also a concern with what happens in the signal distribution in the horizontal plane. In previous generations, a fundamental related concept is the division of the coverage area by sectors, something that was directly related to the beamwidth of the ERB antennas. For example, using 120º beam antennas, 3 antennas covered the 360º that would characterize the entire area. With multiple beams, one can imagine maintaining this concept and expanding the number of sectors. For example, with widths of 10 degrees per beam, horizontally, 36 would be needed to cover the entire area. From the above, I ask: the concept of the coverage sector remains in 5G, adapted to the multiple beams of the antennas MIMO?
Given the considerable (apparently) change in planning: do the concepts of coverage area and percentage of coverage area remain essential for planning? What other related concepts came to be used? On 4G, are they already used?
Given the complexity of using and coordinating multiple beams: in which scenarios and application conditions, will the MIMO strategy with multiple beams be used? The macro scenario is extreme broadband, communication ultra-reliable, or massive communication for multiple users? Is the environment outdoors, indoors, or both? Is the band sub-6 GHz or millimeter wave?
Still on the previous question, in the scenarios foreseen for using MIMO with multiple beams, another question arises. In which of these
beamforming scenarios will be “fixed” and in which will it be adaptive (following cluster of users, with or without the interposition of nulls of the radiation pattern in the directions of other groups considered interference for that cluster)?
Finally, considering all the different aspects of previous generations brought by the multi-user (multibeam) MIMO approach of 5G discussed here….
How has the link budget analysis been (or needs to be) adapted to address these aspects?
Best Regards!
A simple way is to just add a beam forming gain in the link budget for data calculations
Best video. Very intuitive. Mimo simplified. Subscribed. Shall see all videos inshallah.
One simple question. What is the reason base station is called eNodeB?
This comes from 3G, where a base station is called Node-B. So for LTE, it became eNodeB where "e" indicates "Evolved"
@@OurTechPlanet thank you so much. So clear…
@@shahnaz1981fat You are welcome!
@@OurTechPlanet
Thanks.
Is there any difference between ofdm and ofdma? Are all UE's equipped with SDR? Similarly all antennas at enodeb?
Thanks for this wonderful and clear video explanations on Massive MIMO
Thanks
First Thanks u sir 🙏
Secondly please tell me how 2 user can use same through put at the same time
Why they didn't share 80% (40% for UE1 & 40% UE2)
I want te know how they takes advantage of throughput because it is limited to frequencies?
23:40
In that case, they are separated over different beams so then they can use the same frequency and time resources - this is the basis of MU-MIMO.
@@OurTechPlanet Ah okey
That's mean its like RE-USE in GSM
But with same parameters & throughput! Cause they are separated by other beams?
Great video ; what about defining the beam based on SRS feedback : how it works ?
Thanks. SRS based precoding and beamforming decisions are done inside the gNB and that is more of a vendor specific algorithm
This video is perfectttt, thank you very muchhh
You are most welcome
@@OurTechPlanet I think every hungry person to MIMO should subscribe here
Very clear explanations. Great ! Thank you for it.
Thanks! :)
Thank you for share this useful training. would you please share maasive mimo optimization traing
Sure, I will add it to my To-Do list :)
@@OurTechPlanet Many thanks 🙏
Thanks bro for the video.You make concept clear easily. Will wait for your video on coreset.
You are welcome :)
So clear with you!
Thanks
Thank you, very interesting.
Thanks!
amazing explanation and very clear accent. love from Pakistan
Thanks a lot :)
Simplified complex topic and very well explained, thanks for sharing your knowledge.
You are welcome :)
Excellent!! Very well explained
Glad to help. Do spread the word :)
Complicated topic explained in very simple manner. Thanks
Thanks Moorthy, this is what we strive for - to demystify the complication topics :)
Amazing boss 👍 nice example.
Waiting for next session
Thanks! Stay Tuned! :)
Very very good explanations. Many thanks!
You are welcome and Great to hear that :)
very clear pro... thanks alot!
You are welcome!
With MU-MIMO paired UEs will have Rank-2 Transmission instead of Rank-4 Transmission in SU-MIMO case, right?
Yeah that is the usual case!
It is best video on MIMO, explained in very easy way... Great work
Thanks, Pradeep :)
Very nice ;simple explanation ,easy to follow .Thanks sir 👍👍
You are welcome!
Very efficiently made. Thanks for this.
You are welcome!
Really Great!!!
Thanks
Good one nice explanation 👍 waiting for 2nd vidoe for more deep understanding
Thanks! Coming Soon! :)
here which SINR you are talking about ? CSI RS or SSB SINR?
For traffic channels, SSB SINR is not used.
Great brother Ali Simple & nice explanation Thanks
You are welcome! :)
Thank u for sharing this.
My pleasure
Excellent way of explanation 😊 . Thank you!
You are most welcome! :)
what is the use of Rank indicator ? you didnot mention about that
Rank Indicator is the indicator that the UE sends to the gNB to tell the gNB how many MIMO layers it can support in the current radio conditions.
Thanks a lot, very good explanation and brilliant english, 👍👍👍👍
Thank you! 😃
can u please add GoB explanation, and how its selected?
Sure, will add it to my list :)
Very well explained.
Thanks :)
Beautiful! Thanks
You are welcome :)
Pmi info is having only 2 components. Does it mean that beams can b allocated only in 2d space? For Backside coverage???
Yeah, in a simplified manner, it is correct that the beams are allocated on 2d space if we consider type1 codebooks. But more on this will be shared on the next Massive MIMO video :)
@@OurTechPlanet looking forward for the next simplified video…
I request videos on Modulation and multiple access techniques for wireless . Drawbacks of cdma and benifits of ofdma ,
Why DL-ofdma and UL- SC fdma.
I did ms research in pattern recognition and image processing. For PhD I was asked to change my domain. I am strugggling for that. Your explanation is very clear. Looking forward for basic topics..
bestesssssssttt video for MIMO
Thanks a lot :)
Thx a lot for this Video
You're welcome buddy.
Lot of new inputs appreciate your effort
Thanks :)
one quesiton : is such beam fix or can be changed ? is any gap betweet two beam?
This is more of a vendor implementation based thing but for a given PMI, a corresponding beam should be fixed. And the gap between beams depends on number of beams (number of csi-rs ports or SRS implementation). Generally, Higher CSI-RS ports, will have more beams and lower gap between beams.
@@OurTechPlanet thanks a lot and one more question if the implementation use SRS (TDD) instead of PMI is maybe more accurate？
Amazing explanation 👏
Thanks :)
It was really great
Thanks Aghil
Great explanation. If you don't mind, are you from Bangladesh? I have great colleagues originally from Bangladesh, just wondering.
Thanks, Forouzan. No, not from Bangladesh mate :)
@@OurTechPlanet Anywhere you are from, be blessed, I am a fan and will check out any time I get notification. :)
thank you for this amazing video.
You are welcome!
Very well explained 👍
Glad it was helpful!
you have always been a best mentor Ali..thanks Bro
You made my day 🙂 Thanks