Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pilot Signal Design for Massive MIMO Systems: A Received
  Signal-To-Noise-Ratio-Based Approach   In this paper, the pilot signal design for massive MIMO systems to maximize
the training-based received signal-to-noise ratio (SNR) is considered under two
channel models: block Gauss-Markov and block independent and identically
distributed (i.i.d.) channel models. First, it is shown that under the block
Gauss-Markov channel model, the optimal pilot design problem reduces to a
semi-definite programming (SDP) problem, which can be solved numerically by a
standard convex optimization tool. Second, under the block i.i.d. channel
model, an optimal solution is obtained in closed form. Numerical results show
that the proposed method yields noticeably better performance than other
existing pilot design methods in terms of received SNR.

13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th