Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy-Efficient, Large-scale Distributed-Antenna System (L-DAS) for
  Multiple Users   Large-scale distributed-antenna system (L-DAS) with very large number of
distributed antennas, possibly up to a few hundred antennas, is considered. A
few major issues of the L-DAS, such as high latency, energy consumption,
computational complexity, and large feedback (signaling) overhead, are
identified. The potential capability of the L-DAS is illuminated in terms of an
energy efficiency (EE) throughout the paper. We firstly and generally model the
power consumption of an L-DAS, and formulate an EE maximization problem. To
tackle two crucial issues, namely the huge computational complexity and large
amount of feedback (signaling) information, we propose a channel-gain-based
antenna selection (AS) method and an interference-based user clustering (UC)
method. The original problem is then split into multiple subproblems by a
cluster, and each cluster's precoding and power control are managed in parallel
for high EE. Simulation results reveal that i) using all antennas for
zero-forcing multiuser multiple-input multiple-output (MU-MIMO) is energy
inefficient if there is nonnegligible overhead power consumption on MU-MIMO
processing, and ii) increasing the number of antennas does not necessarily
result in a high EE. Furthermore, the results validate and underpin the EE
merit of the proposed L-DAS complied with the AS, UC, precoding, and power
control by comparing with non-clustering L-DAS and colocated antenna systems.

15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg