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Definition: Massive MIMO

(Massive Multiple Input/Multiple Output) Many antennas each transmitting simultaneously. Massive MIMO may be employed using four transmit and four receive antennas (4x4) or an 8x8 configuration in an access point. There are also 64x64 deployments in cell towers and large venues. See MIMO and MU-MIMO.

The Rice University Argos Project
In 2016, this was a prototype of a Massive MIMO base station with 64 antennas. Each (white) antenna sends a narrow beam to a single user. Similar configurations have since been implemented around the world by Ericsson and other communications vendors. (Image courtesy of Rice University, http://argos.rice.edu)