Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Compression Strategy for the Downlink Cloud Radio Access
  Network   This paper studies the downlink of a cloud radio access network (C-RAN) in
which a centralized processor (CP) communicates with mobile users through base
stations (BSs) that are connected to the CP via finite-capacity fronthaul
links. Information theoretically, the downlink of a C-RAN is modeled as a
two-hop broadcast-relay network. Among the various transmission and relaying
strategies for such model, this paper focuses on the compression strategy, in
which the CP centrally encodes the signals to be broadcasted jointly by the
BSs, then compresses and sends these signals to the BSs through the fronthaul
links. This paper characterizes an achievable rate region for a generalized
compression strategy with Marton's multicoding for broadcasting and
multivariate compression for fronthaul transmission. We then compare this rate
region with the distributed decode-forward (DDF) scheme, which achieves the
capacity of the general relay networks to within a constant gap, and show that
the difference lies in that DDF performs Marton's multicoding and multivariate
compression jointly as opposed to successively as in the compression strategy.
A main result of this paper is that under the assumption that the fronthaul
links are subject to a \emph{sum} capacity constraint this difference is
immaterial, so the successive encoding based compression strategy can already
achieve the capacity region of the C-RAN to within a constant gap, where the
gap is independent of the channel parameters and the power constraints at the
BSs. For the special case of the Gaussian network, we further establish that
under individual fronthaul constraints, the compression strategy achieves to
within a constant gap to the \emph{sum} capacity of the C-RAN.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas