Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heterogeneous graph neural network for power allocation in
  multicarrier-division duplex cell-free massive MIMO systems   In-band full duplex-based cell-free (IBFD-CF) systems suffer from severe
interference problem including self-interference (SI) and cross-link
interference (CLI), especially when cell-free (CF) systems are operated in a
distributed way. To this end, we propose multicarrier-division duplex (MDD) as
an enabler for full-duplex (FD)-style operation in distributed CF massive MIMO
systems, where DL and UL transmissions take place simultaneously at the same
frequency band but mutually orthogonal subcarrier sets. In order to maximize
the spectral efficiency (SE) in the proposed systems, we present heterogeneous
graph neural network specific for CF systems (CF-HGNN), which consists of an
adaptive node embedding layer, meta-path based message passing, meta-path based
attention and downstream power allocation learning. In particular, the adaptive
node embedding layer can handle the varying number of access points (APs),
mobile stations (MSs) and subcarriers, and the involved attention mechanism
enables each AP/MS node in CF-HGNN to aggregate the information from
interfering path and communication path with different priorities. Numerical
results show that CF-HGNN is capable of using $10^4$ times less operation time
to achieve the 99% performance of the SE of quadratic transform and successive
convex approximation (QT-SCA). Additionally, CF-HGNN also significantly
outperforms unfair greedy method in terms of SE performance. Furthermore,
CF-HGNN exhibits good adaptivity to varying number of nodes and subcarriers,
and also generalization ability to different sizes of CF network.

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The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: econ
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat