If I have massive MIMO works as a base station(BS) with Nt number of transmitting antennas and Mr single antennas users, by assuming that downlink mode, how the symbols transmitted in each antenna.
for simplicity choose
Nt=16
Mr=4
number of symbols (data) to be transmitted X1......X128 from BS
Mohammed, you can find many massive MIMO tutorials, such as this one:
Article Beamforming techniques for massive MIMO systems in 5G: overv...
But what you are describing is MIMO, not massive MIMO. In massive MIMO, you would typically have 100 or more transmitting antennas, and often the receiver has only one. The idea being, with mm waves and a massive number of transmit antennas, the BS can aim the beam in different directions, simultaneously supporting multiple different links, on the same RF frequency channel.
MIMO is used to exploit multiple data paths, from a transmitter to a receiver. The more decorrelated the propagation paths are, the more you can fool Shannon's equation. Ultimately, an 8 X 8 MIMO can provide 8 times the channel capacity, as what Shannon's equation predicts. If the paths are completely decorrelated.
Massive MIMO goes beyond that, actually forming beams, to receivers at different locations.
There are many books and tutorials that you can read to learn these things in detail.
Here is a short document: http://www.diva-portal.org/smash/get/diva2:1049059/FULLTEXT02.pdf
And my full-length book: https://github.com/emilbjornson/massivemimobook/raw/master/massive_MIMO_networks.pdf
Dear Mohammed Jabbar Mohammed Ameen ,
Adding to the colleagues above I will give a conceptual answer.
In the Mimo or the massive mimo transmission system it is assumed that there is only space division multiplexing. This means that every user uses the same frequency and time resources. One method is then is to apply all symbols to all antennas. Then one use precoding to steer specific symbols to their intended user.
An other method is to divide the antennas into groups and apply the symbols intended for one user on them. One make beam forming to focus the radiation of one group to its intended user.
Best wishes
Adding to the above discussion, transmission also depends upon whether you want to achieve spatial multiplexing gain or spatial diversity gain.
Regards
You can see the 2nd white paper in https://tetcos.com/5G-white-papers.html
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