Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Adaptive Regularized Zero-Forcing Precoding for Massive MIMO Systems
  with Multi-Antenna Users   Modern wireless cellular networks use massive multiple-input multiple-output
(MIMO) technology. This technology involves operations with an antenna array at
a base station that simultaneously serves multiple mobile devices which also
use multiple antennas on their side. For this, various precoding and detection
techniques are used, allowing each user to receive the signal intended for him
from the base station. There is an important class of linear precoding called
Regularized Zero-Forcing (RZF). In this work, we propose Adaptive RZF (ARZF)
with a special kind of regularization matrix with different coefficients for
each layer of multi-antenna users. These regularization coefficients are
defined by explicit formulas based on SVD decompositions of user channel
matrices. We study the optimization problem, which is solved by the proposed
algorithm, with the connection to other possible problem statements. We also
compare the proposed algorithm with state-of-the-art linear precoding
algorithms on simulations with the Quadriga channel model. The proposed
approach provides a significant increase in quality with the same computation
time as in the reference methods.

34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph