5G MIMO spatial multiplexing
Basically, “MIMO spatial multiplexing” is used to further increase the throughput, capacity of 5G mobile networks by downloading multiple multi-paths (multi-antenna pathways created by multiple MIMO antennas). Useful to bring a lot of data.
1. Channel State Information
MIMO technology, the properties of the channels in the spatial channel space between the antenna component, the broadcast antenna element of the base station and the receiving antenna of the “user terminals” are characterized by their respective "transfer functions".
Pilot signals from user terminals are used to determine these channel transfer characteristics (transfer functions). An H matrix, which is a set of these transfer functions, is called a Channel State Information (CSI).
CSI (Matrix H) is used as a basis for calculating matrices for data acquisition (Detection matrices) at the base station as well as matrices for data release (precoding matrices) to user terminals. . There are several methods to calculate these Detection and precoding matrices.
2. Spatial multiplexing
Spatial multiplexing means that different data streams are transmitted from different antenna element components at different frequencies and at the same time on separate spatial channels, where these channels are characterized. Already through the CSI information mentioned above. When different users receive these different data streams simultaneously, it is called MU-MIMO (MU: Multi User).