Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large-System Analysis of Joint User Selection and Vector Precoding with
  Zero-Forcing Transmit Beamforming for MIMO Broadcast Channels   Multiple-input multiple-output (MIMO) broadcast channels (BCs) (MIMO-BCs)
with perfect channel state information (CSI) at the transmitter are considered.
As joint user selection (US) and vector precoding (VP) (US-VP) with
zero-forcing transmit beamforming (ZF-BF), US and continuous VP (CVP) (US-CVP)
and data-dependent US (DD-US) are investigated. The replica method, developed
in statistical physics, is used to analyze the energy penalties for the two
US-VP schemes in the large-system limit, where the number of users, the number
of selected users, and the number of transmit antennas tend to infinity with
their ratios kept constant. Four observations are obtained in the large-system
limit: First, the assumptions of replica symmetry (RS) and 1-step replica
symmetry breaking (1RSB) for DD-US can provide acceptable approximations for
low and moderate system loads, respectively. Secondly, DD-US outperforms CVP
with random US in terms of the energy penalty for low-to-moderate system loads.
Thirdly, the asymptotic energy penalty of DD-US is indistinguishable from that
of US-CVP for low system loads. Finally, a greedy algorithm of DD-US proposed
in authors' previous work can achieve nearly optimal performance for
low-to-moderate system loads.

32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an