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Massive MIMO - What is it ?

As the name implies, Massive MIMO is an antenna array system using Massive Amount of Antenna. It is also called Large Scale MIMO.

Then you may ask "How many Antenna is required to be called 'Massive (Large Scale) MIMO' ?".

The answer may be different depending on how you design the reciever algorithm (equalizer design), but assuming that we use the simplest (the most primitive) reciever design, we may need over 300 antenna. If you think this is too big number, you may decrease the number by applying a little bit smarter reciever (equalizer) algorithm.

In some of the prototype system that can be called as Massive MIMO, I see the number to be 64, 256 but you would see different numbers as more prototypes are implemented.

In conventional LTE using a normal MIMO, the maximum number of antenna in MIMO as of now (Mar 2015) is 8 x 2 or 4 x 4.

For further details of the Massive MIMO, refer to following pages.

• Why we need it ?
• Channel Model
• Reciever Model
• FD-MIMO
• MU-MIMO
• Technical Challenges

Reference

[1] GFDM Interference Cancellation for Flexible Cognitive Radio PHY Design

R. Datta, N. Michailow, M. Lentmaier and G. Fettweis

Vodafone Chair Mobile Communications Systems,

Dresden University of Technology,

01069 Dresden, Germany

Email:[rohit.datta, nicola.michailow, michael.lentmaier, fettweis]@ifn.et.tu-dresden.de

[2] 5G NOW. D3.1 5G Waveform Candidate Selection

[3] Massive MIMO and Small Cells : Improving Energy Efficiency by Optimal Soft-Cell Coordination

Emil Bjornson, Marios Kountouris and Merouane Debbah

Alcatel-Lucent Chair on Flexible Radio, SUPELEC, Gif-sur-Yvette, France

Department of Telecommunications, SUPELEC, Gif-sur-Yvette, France

ACCESS Linnaeus Center, Signal Processing Lab, KTH Royal Institue of Technology, Stockholm, Sweden

[4] Massive MIMO Info Point

[5] Massive MIMO for Next Generation Wireless Systems

Erik G. Larson, ISY, Linkoping University, Sweden

Ove Edfors, Lund University, Sweden

Fredrik Tufvesson, Lund University, Sweden

Thomas L. Marzetta, Bell Labs, Alcatel-Lucent, USA

[6] Scaling up MIMO : Opportunities and Challenges with Very Large Arrays

Fredrik Rusek, Dept. of Electrical and Information Technology, Lund University, Lund, Sweden

Daniel Persson, Dept. of Electrical Engineering (ISY), Linkoping University, Sweden

Buon Kiong Lau, Dept. of Electrical and Information Technology, Lund University, Lund, Sweden

Erik G. Larsson, Dept. of Electrical Engineering (ISY), Linkoping University, Sweden

Thomas L. Marzetta, Bell Laboratories, Alcatel-Lucent, Murray Hill, NJ

Ove Edfors, Dept. of Electrical and Information Technology, Lund University, Lund, Sweden

Fredrik Tufvesson, Dept. of Electrical and Information Technology, Lund University, Lund, Sweden