Throughput Analysis of Massive MIMO Uplink With Low-Resolution ADCs
Artikel i vetenskaplig tidskrift, 2017

We investigate the uplink throughput achievable by a multiple-user (MU) massive multiple-input multiple-output (MIMO) system, in which the base station is equipped with a large number of low-resolution analog-to-digital converters (ADCs). Our focus is on the case where neither the transmitter nor the receiver have any a priori channel state information. This implies that the fading realizations have to be learned through pilot transmission followed by channel estimation at the receiver, based on coarsely quantized observations. We propose a novel channel estimator, based on Bussgang's decomposition, and a novel approximation to the rate achievable with finite-resolution ADCs, both for the case of finite-cardinality constellations and of Gaussian inputs, that is accurate for a broad range of system parameters. Through numerical results, we illustrate that, for the 1-bit quantized case, pilot-based channel estimation together with maximal-ratio combing, or zero-forcing detection enables reliable multi-user communication with high-order constellations, in spite of the severe nonlinearity introduced by the ADCs. Furthermore, we show that the rate achievable in the infinite-resolution (no quantization) case can be approached using ADCs with only a few bits of resolution. We finally investigate the robustness of low-ADC-resolution MU-MIMO uplink against receive power imbalances between the different users, caused for example by imperfect power control.

linear minimum mean square error (LMMSE)

Analog-to-digital converter (ADC)

channel capacity

Författare

Sven Jacobsson

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Giuseppe Durisi

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Mikael Coldrey

Ericsson Sweden

Ulf Gustavsson

Ericsson Sweden

Christoph Studer

Cornell University

IEEE Transactions on Wireless Communications

1536-1276 (ISSN)

Vol. 16 4038-4051 7894211

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/TWC.2017.2691318