In a wireless network, a collision is a situation that occurs when two or more devices attempt to send a signal along the same transmission channel at the same time. To avoid collisions we use CSMA/CA so clients can send data to an AP one at a time. CSMA/CA does this by sending RTS/CTS frames to the network.
But knowing this how MU-MIMU avoids collisions?
I know it uses different antennas for communicating with different devices. Does this mean that each antenna works on a different wireless channel to avoid RF interference and as a result avoiding collisions?