Lecture 5: Introduction to Multiuser MIMO

This is the video for Lecture 5 in the course Multiple Antenna Communications at Linköping University and KTH. The lecture covers: Limitations of point-to-point MIMO, the motivation behind multi-user MIMO, non-orthogonal and orthogonal multiple access, the capacity region and how to compute it in the uplink.

The slides are available here:
https://github.com/emilbjornson/multi...

0:00 Introduction
0:43 Recall: Point-to-Point MIMO Capacity . Compute SVD of channel matrix
4:17 Problems with point-to-point MIMO • Multiplexing gain: S = rank(G)
7:17 Multiuser MIMO Communication
8:32 Orthogonal multiple access . Two users want to communicate with base station
15:02 Non-orthogonal multiple access: Rate region Four operating points (R.R)
19:15 Uplink Multiuser MIMO: System model
21:44 What is the difference from point-to-point MIMO?
24:26 Motivating example
26:40 Shape of capacity region • One can pick two points and use them fractions of the time
27:49 Points in the capacity region • Combinations (RR) of rates that can be simultaneously achieved
30:46 Sum Capacity of Uplink Multiuser MIMO • Recall: Received signal
36:35 Summary Point-to-point MIMO channels - Large multiplexing gains are hard to achieve in practice