Massive MIMO systems with hardware-constrained base stations
Paper i proceeding, 2014

Massive multiple-input multiple-output (MIMO) systems are cellular networks where the base stations (BSs) are equipped with unconventionally many antennas. Such large antenna arrays offer huge spatial degrees-of-freedom for transmission optimization; in particular, great signal gains, resilience to imperfect channel knowledge, and small inter-user interference are all achievable without extensive inter-cell coordination. The key to cost-efficient deployment of large arrays is the use of hardware-constrained base stations with low-cost antenna elements, as compared to today's expensive and power-hungry BSs. Low-cost transceivers are prone to hardware imperfections, but it has been conjectured that the excessive degrees-of-freedom of massive MIMO would bring robustness to such imperfections. We herein prove this claim for an uplink channel with multiplicative phase-drift, additive distortion noise, and noise amplification. Specifically, we derive a closed-form scaling law that shows how fast the imperfections increase with the number of antennas.

massive MIMO

scaling laws

channel estimation

Achievable uplink rates

transceiver hardware imperfections


E. Björnson

Kungliga Tekniska Högskolan (KTH)

Nokia Corporation

Michail Matthaiou

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

M. Debbah

Nokia Corporation

2014 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2014; Florence; Italy; 4 May 2014 through 9 May 2014

1520-6149 (ISSN)