In our multi-user MIMO (MU-MIMO) series, we look at the advantages and challenges advanced multiple-input/multiple-output (MIMO) technologies where the available antennas are spread over a multitude of independent access points and independent radio terminals where each has one or multiple antennas.

Here’s links to the three posts in this series:

A recap of Part 1

In this introductory blog post, we explain what MU-MIMO is and what benefits it offers. We list the typical topics covered in MU-MIMO literature and explain the first one, precoding techniques.

A recap of Part 2

In Part 2 we look into what information theory suggests is the optimum strategy for a MU-MIMO downlink broadcast channel and system performance factors.

A recap of Part 3

In Part 3, we discuss implementing MU-MIMO concepts into existing standards, specifically LTE. While MU-MIMO is already supported in LTE Release 8, there are a number of issues that need to be addressed. We discuss this issues and look at some promising projects.