Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the LoRa Modulation for IoT: Waveform Properties and Spectral
  Analysis   An important modulation technique for Internet of Things (IoT) is the one
proposed by the LoRa allianceTM. In this paper we analyze the M-ary LoRa
modulation in the time and frequency domains. First, we provide the signal
description in the time domain, and show that LoRa is a memoryless continuous
phase modulation. The cross-correlation between the transmitted waveforms is
determined, proving that LoRa can be considered approximately an orthogonal
modulation only for large M. Then, we investigate the spectral characteristics
of the signal modulated by random data, obtaining a closed-form expression of
the spectrum in terms of Fresnel functions. Quite surprisingly, we found that
LoRa has both continuous and discrete spectra, with the discrete spectrum
containing exactly a fraction 1/M of the total signal power.

25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ