What is Massive MIMO?

Explains the main aspects of Massive MIMO communications.

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[siddharthabhakta]

Only video I found on this subject which gives full engineering details. Just spot on. I loved it.

[prabhatsahoo]

Very lucidly explained. Pros and Cons are nicely explained

[mandarmoksha]

Big fan of your work Lain... Thank you!

[neelanjanasubinferdous]

Respected Sir,
Thank You so much for such nice informative videos. Really very helpful.

[jainpakpoom]

Thank you for this video. All your videos have really been helpful and informative.

[王大維-wt]

Thanks a lot! I’ve been waiting for this a while

[malini]

Hi Sir! In Hybrid beam forming when you say x antennas have same theta(phase), how all three will transmit/receive at a time? already the beams are narrow. Please elaborate.

[한두혁]

Hello I have a question. In 1:25 you said that carrier freq and bandwidth are proportional & inverse proportionality of optimal radiating size. How can I understand this?

[nelsonmakeketa]

Good Stuff thanks you soo much sir had to refresh my knowledge.

[shahriarsowad]

Prof. Is there any particular book you will suggest to learn all the basics of MIMO communication ?

[joeb]

Atmospheric and moisture absorption goes up with frequency. This reduces the coherence bandwidth as well the range. Availability is reduced significantly. The trade becomes cell size reduction which increases the need for smaller cell size and more of them per service area. There is a practical limit as frequency used goes up and it is reached quickly as a function of RF frequency. Increased transmit power and or antenna gain does not overcome this as phase coherence is lost before SNR goes below minimum detectable signal levels. Antenna cross polarization/ depolarization at the antenna also is severly degraded due to droplet size of moisture within the field of regard of the antenna array and each formed beam. Remedies are non trivial. The design trades have to address this above 10 ghz to determine feasible system designs.

[pitmaler]

In dig. beamforming we have the RF chain after the processing, that's clear. Does that RFchain includes the FFT or IFFT? Or there just converters, filters, amplifiers, ....?
Thank you.

[wisepshouse]

hello sir thanks to your informative videos, but i got a question here, why is in some books they say the massive mimo is the systems focus on adding a much higher number of antennas on the base station,

[jeewithbanerjee]

Please cover reconfigurable intelligent surfaces

[mopol]

Hi doctor
first thanks for all these information
Mr i have a question witch is
favorable propagation is when the channel responses from
the base station to user terminals are mutually orthogonal ?
what is mutually orthogonal?

[wumeng]

Hi Prof! As MIMO requires rich scattering environment, does it mean that narrower beams from gNB with large N to UE with small M isn’t suitable for high rank transmissions as the effective BFed channel becomes sparse such that there is insufficient scatterers around the UE to decorrelate the channel? (TX correlation is assumed less problematic considering orthogonal beams to transmit multiple layers)

[lakshmikandula]

prof can you please explain how increment in carrier frequency leads to bandwidth increment ?

[TejasGaga]

Respected Sir, Very good video.. very informative....Kindly make one video on Modelling Massive MIMO mathematically as compared to MIMO modelling Like y=Hx+n in case of MIMO.(Request)

[lancecruwys]

I'm probably confused here but don't we want reduced multipath diversity as that would cause more distortion the higher it is?

[sabertooth]

This channel is only for professors i guess coz I'm not able to understand a single term from it😭😭