My research interests are the effect of nonlinear hardware on massive MIMO and low-PAR precoding techniques, which is a means to reduce the linearity requirements of the base station hardware.

Massive MIMO is a wireless transmission technique, where the base station is equipped with hundreds of individually controllable antennae, and where multiple users are served at the same time over the same frequency. This transmission technique has the potential to increase data rates in future communication networks, to connect more devices to the network, as well as to decrease the power consumption of the base stations – making wireless communication more environmentally friendly.

To build a base station with hundreds of individually controllable antennae, a large amount of hardware is needed. My research investigates the possibility to use inexpensive, less linear hardware components, which is one way to bring down the cost and complexity of the base station to make massive MIMO a practical technology for future wireless communication systems.

I am and have been teaching the following courses: the CDIO courseSignal Theory and Signals, Information and Communications. I also supervise master thesis students.

News

Please, contact me if you are interested in doing a master thesis in massive MIMO. I have some ideas that I want to try out.

On September 2, 2016, I defended my licentiate thesis “On Massive MIMO Base Stations with Low-End Hardware”. Please, let me know if you are interested in a copy of the dissertation. It is also available at the university library.

Visit our blog to read more about massive MIMO.

Publications

2017

Christopher Mollén, Junil Choi, Erik G. Larsson, Robert W. Heath

Achievable Uplink Rates for Massive MIMO with Coarse Quantization

Conference paper

Salil Kashyap, Christopher Mollén, Björnson Emil, Erik G. Larsson

Performance Analysis of (TDD) Massive MIMO with Kalman Channel Prediction

Conference paper

Christopher Mollén, Junil Choi, Erik G. Larsson, Robert W. Heath

Uplink Performance of Wideband Massive MIMO With One-Bit ADCs

Article in journal

Research activities

Staff at Communication Systems

About the division

About the department