Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Pilot Assignment in Large-Scale Distributed MIMO Networks   We consider the pilot assignment problem in large-scale distributed
multi-input multi-output (MIMO) networks, where a large number of remote radio
head (RRH) antennas are randomly distributed in a wide area, and jointly serve
a relatively smaller number of users (UE) coherently. By artificially imposing
topological structures on the UE-RRH connectivity, we model the network by a
partially-connected interference network, so that the pilot assignment problem
can be cast as a topological interference management problem with multiple
groupcast messages. Building upon such connection, we formulate the topological
pilot assignment (TPA) problem in two different ways with respect to whether or
not the to-be-estimated channel connectivity pattern is known a priori. When it
is known, we formulate the TPA problem as a low-rank matrix completion problem
that can be solved by a simple alternating projection algorithm. Otherwise, we
formulate it as a sequential maximum weight induced matching problem that can
be solved by either a mixed integer linear program or a simple yet efficient
greedy algorithm. With respect to two different formulations of the TPA
problem, we evaluate the efficiency of the proposed algorithms under the
cell-free massive MIMO setting.

31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat