Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: User-Centric Intercell Interference Nulling for Downlink Small Cell
  Networks   Small cell networks are regarded as a promising candidate to meet the
exponential growth of mobile data traffic in cellular networks. With a dense
deployment of access points, spatial reuse will be improved, and uniform
coverage can be provided. However, such performance gains cannot be achieved
without effective intercell interference management. In this paper, a novel
interference coordination strategy, called user-centric intercell interference
nulling, is proposed for small cell networks. A main merit of the proposed
strategy is its ability to effectively identify and mitigate the dominant
interference for each user. Different from existing works, each user selects
the coordinating base stations (BSs) based on the relative distance between the
home BS and the interfering BSs, called the interference nulling (IN) range,
and thus interference nulling adapts to each user's own interference situation.
By adopting a random spatial network model, we derive an approximate expression
of the successful transmission probability to the typical user, which is then
used to determine the optimal IN range. Simulation results shall confirm the
tightness of the approximation, and demonstrate significant performance gains
(about 35%-40%) of the proposed coordination strategy, compared with the
non-coordination case. Moreover, it is shown that the proposed strategy
outperforms other interference nulling methods. Finally, the effect of
imperfect channel state information (CSI) is investigated, where CSI is assumed
to be obtained via limited feedback. It is shown that the proposed coordination
strategy still provides significant performance gains even with a moderate
number of feedback bits.

19
The categories of this paper are: eess
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga