Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: DoF Analysis of the K-user MISO Broadcast Channel with Alternating CSIT   We consider a $K$-user multiple-input single-output (MISO) broadcast channel
(BC) where the channel state information (CSI) of user $i(i=1,2,\ldots,K)$ may
be either perfect (P), delayed (D) or not known (N) at the transmitter with
probabilities $\lambda_P^i$, $\lambda_D^i$ and $\lambda_N^i$, respectively. In
this channel, according to the three possible CSIT for each user, joint CSIT of
the $K$ users could have at most $3^K$ realizations. Although the results by
Tandon et al. show that the Degrees of Freedom (DoF) region for the two user
MISO BC with symmetric marginal probabilities (i.e., $\lambda_Q^i=\lambda_Q
\forall i\in \{1,2,\ldots,K\}, Q\in \{P,D,N\}$) depends only on the marginal
probabilities, we show that this interesting result does not hold in general
when the number of users is more than two. In other words, the DoF region is a
function of the \textit{CSIT pattern}, or equivalently, all the joint
probabilities. In this paper, given the marginal probabilities of CSIT, we
derive an outer bound for the DoF region of the $K$-user MISO BC. Subsequently,
the achievability of these outer bounds are considered in certain scenarios.
Finally, we show the dependence of the DoF region on the joint probabilities.

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The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn