Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IRS-aided MIMO Systems over Double-scattering Channels: Impact of
  Channel Rank Deficiency   Intelligent reflecting surfaces (IRSs) are promising enablers for
next-generation wireless communications due to their reconfigurability and high
energy efficiency in improving poor propagation condition of channels, e.g.,
limited scattering environment. However, most existing works assumed full-rank
channels requiring rich scatters, which may not be available in practice. To
analyze the impact of rank-deficient channels and mitigate the ensued
performance loss, we consider a large-scale IRS-aided MIMO system with
statistical channel state information (CSI), where the double-scattering
channel is adopted to model rank deficiency. By leveraging random matrix theory
(RMT), we first derive a deterministic approximation (DA) of the ergodic rate
with low computational complexity and prove the existence and uniqueness of the
DA parameters. Then, we propose an alternating optimization algorithm for
maximizing the DA with respect to phase shifts and signal covariance matrices.
Numerical results will show that the DA is tight and our proposed method can
effectively mitigate the performance loss induced by channel rank deficiency.

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The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph