Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uplink Performance of Conventional and Massive MIMO Cellular Systems
  with Delayed CSIT   Massive multiple-input multiple-output (MIMO) networks, where the base
stations (BSs) are equipped with large number of antennas and serve a number of
users simultaneously, are very promising, but suffer from pilot contamination.
Despite its importance, delayed channel state information (CSI) due to user
mobility, being another degrading factor, lacks investigation in the
literature. Hence, we consider an uplink model, where each BS applies
zero-forcing decoder, accounting for both effects, but with the focal point on
the relative users' movement with regard to the BS antennas. In this setting,
analytical closed-form expressions for the sum-rate with finite number of BS
antennas, and the asymptotic limits with infinite number of BS antennas
epitomize the main contributions. In particular, the probability density
function of the signal-to-interference-plus-noise ratio and the ergodic
sum-rate are derived for any finite number of antennas. Insights of the impact
of the arising Doppler shift due to user mobility into the low signal-to-noise
ratio regime as well as the outage probability are obtained. Moreover,
asymptotic analysis performance results in terms of infinitely increasing
number of antennas, power, and both numbers of antennas and users (while their
ratio is fixed) are provided. The numerical results demonstrate the performance
loss in various Doppler shifts. An interesting observation is that massive MIMO
is favorable even in time-varying channel conditions.

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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin