What is the benefit or application of using a massive MIMO system assuming 128 antennas in the transmitter and 128 antennas in the receiver if the transmission is in one direction (downlink or uplink mode)? can be replaced by the SISO system?
Actually, if transmitter and receiver have 128 antennas, I assume they are both base stations. In that case, and if they do not move, using SISO with directive antennas pointing at each other can would be equivalent to using massive MIMO antennas. However, if the locations of transmitter and receiver are not constant (if they move), using a massive MIMO antenna is better since it can adapt the beams it uses in order to always point in the right direction.
I'm assuming that you're referring to the transmitter and receiver both on the same radio (e.g. the base station) since otherwise you're just talking about an array used for a point-to-point link. No mobile station will have that many elements.
Massive MIMO is about allowing a single base station to simultaneously communication with multiple mobile stations (user equipment). It basically merges the concepts of MIMO and beamforming, allowing the base station to maximize the signal-to-interference ratio (SIR) to or from each UE by precoding or post coding the channel conditions required. The method requires full transceivers on each antenna chain to allow full digital beamforming. An intermediate approach that's more common, especially at mmWave, is to use sub-arrays and essentially each sub-array beamforms to a different user. This only allows simultaneous communication with as many users as you have sub-arrays.
Check out the following paper for more information.
Conference Paper What’s in a Name? An Analysis of the True Meaning of MIMO an...
please read this
https://liu.se/elliit/artiklar-3/1.681525/MassiveMIMO_FundamentalsandSystemDesigns.pdf
Dear Mohammed Jabbar Mohammed Ameen ,
Welcome!
If the SISO system can satisfy the requirements of the communication system which is: The bit rate, the bit error rate and the latency then you do not need to gor for MIMO either conventional or massive.
Multiple input multiple output systems are thought to realize following improvement on the wireless transmission system:
- It can improve the the transmission channel which means it can enhance the S/N ratio of the communication channel by means of diversity.
- It can also provide independent paths in the space between the transmitter and the receiver which can be used to transmit additional data in parallel.
This is called spatial multiplexing as the other types of multiplexing.
This will lead to increasing the system capacity and reduce the bit error rate and can reduce the latency.
According to MINO theory the maximum number of independent paths in the NtxNr antenna system is equal to the smaller of Nt or Nr.
Spatial MIMO is thought to multiply the bandwidth of the SISO channel.
Best wishes
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