Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Swift-Link: A compressive beam alignment algorithm for practical mmWave
  radios   Next generation wireless networks will exploit the large amount of spectrum
available at millimeter wave (mmWave) frequencies. Design of mmWave systems,
however, is challenging due to strict power, cost and hardware constraints at
higher bandwidths. To achieve a good SNR for communication, mmWave systems use
large antenna arrays. Beamforming with highly directional beams is one way to
use the antennas. As the channel changes over time, the beams that maximize the
SNR have to be estimated quickly to reduce the training overhead. Prior work
has exploited the observation that mmWave channels are sparse to perform
compressed sensing (CS) based beam alignment with few channel measurements.
Most of the existing CS-based algorithms, however, assume perfect
synchronization and fail in the presence of carrier frequency offset (CFO).
This paper presents Swift-Link, a fast beam alignment algorithm that is robust
against the offset. Swift-Link includes a novel randomized beam training
sequence that minimizes the beam alignment errors due to CFO and a
low-complexity algorithm that corrects these errors. Even with strict hardware
constraints, our algorithm uses fewer channel measurements than comparable CS
algorithms and has analytical guarantees. Swift-Link requires a small output
dynamic range at the analog-to-digital converter compared to beam-scanning
techniques.

5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex