Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Beam Tracking Technique for Millimeter Wave-band Communications   In this paper, we propose an efficient beam tracking method for mobility
scenario in mmWave-band communications. When the position of the mobile changes
in mobility scenario, the base-station needs to perform beam training
frequently to track the time-varying channel, thereby spending significant
resources for training beams. In order to reduce the training overhead, we
propose a new beam training approach called "beam tracking" which exploits the
continuous nature of time varying angle of departure (AoD) for beam selection.
We show that transmission of only two training beams is enough to track the
time-varying AoD at good accuracy. We derive the optimal selection of beam pair
which minimizes Cramer-Rao Lower Bound (CRLB) for AoD estimation averaged over
statistical distribution of the AoD. Our numerical results demonstrate that the
proposed beam tracking scheme produces better AoD estimation than the
conventional beam training protocol with less training overhead.

29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg