Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: URLLC with Massive MIMO: Analysis and Design at Finite Blocklength   The fast adoption of Massive MIMO for high-throughput communications was
enabled by many research contributions mostly relying on infinite-blocklength
information-theoretic bounds. This makes it hard to assess the suitability of
Massive MIMO for ultra-reliable low-latency communications (URLLC) operating
with short blocklength codes. This paper provides a rigorous framework for the
characterization and numerical evaluation (using the saddlepoint approximation)
of the error probability achievable in the uplink and downlink of Massive MIMO
at finite blocklength. The framework encompasses imperfect channel state
information, pilot contamination, spatially correlated channels, and arbitrary
linear spatial processing. In line with previous results based on
infinite-blocklength bounds, we prove that, with minimum mean-square error
(MMSE) processing and spatially correlated channels, the error probability at
finite blocklength goes to zero as the number $M$ of antennas grows to
infinity, even under pilot contamination. On the other hand, numerical results
for a practical URLLC network setup involving a base station with $M=100$
antennas, show that a target error probability of $10^{-5}$ can be achieved
with MMSE processing, uniformly over each cell, only if orthogonal pilot
sequences are assigned to all the users in the network. Maximum ratio
processing does not suffice.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc