Configuring precoders and combiners is a major

challenge to deploy practical multiple-input multiple-output

(MIMO) millimeter wave (mmWave) communication systems

with large antenna arrays. Most prior work addresses the problem

focusing on a total transmit power constraint. In practical

transmitters, however, power amplifiers must operate within their

linear range, so that a power constraint applies to each one

of the input signals to these devices. Therefore, precoder and

combiner designs should incorporate per-antenna or per-radio

frequency (RF) chain transmit power constraints. We focus on

such problem for frequency-selective channels with multicarrier

modulation, and assuming hybrid analog/digital architectures

based on fully connected analog blocks implemented with finite resolution

phase shifters. We first derive an all-digital solution

which aims to maximize spectral efficiency. Then, we develop

hybrid precoders and combiners by approximately matching

the corresponding all-digital matrices while still enforcing the

power constraints. Numerical results show that the proposed

all-digital design performs close to the upper bound given

by the standard waterfilling-based solution with a total power

constraint. Additionally, the hybrid designs exhibit a moderate

loss even when low-resolution phase shifters are considered.

VL - 21
IS - 8
ER -