MIMO Precoding and Combining Solutions for Millimeter Wave Systems
Ahmed Alkhateeb, Jianhua Mo, Nuria Gonzalez Prelcic, and Robert W. Heath, Jr.
Submitted to the IEEE Communications Magazine, Aug. 2014.
Millimeter-wave communication is one way to
alleviate the spectrum gridlock at lower frequencies
while simultaneously providing high-bandwidth
communication channels. MmWave makes
use of MIMO through large antenna arrays at
both the base station and the mobile station to
provide sufficient received signal power. This
article explains how beamforming and precoding
are different in MIMO mmWave systems than in
their lower-frequency counterparts, due to different
hardware constraints and channel characteristics.
Two potential architectures are
reviewed: hybrid analog/digital precoding/combining
and combining with low-resolution analog-to-digital
converters. The potential gains and
design challenges for these strategies are discussed,
and future research directions are highlighted.
Available on IEEE