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Agilent AN 1200-12
Peak Deviation and Center Frequency
Measurements For CT2 and DECT Radios
Application Note
Agilent Technologies 53310A
Modulation Domain Analyzer
Easy Analysis of GMSK
Modulation for CT2 and DECT
Radios Hist
Situation ogra
Fast m of
The use of digital modulation in
h
of pe istogram GFS
ak d
eviat s allow q K Sig
mobile communications systems is ion a u
nd c ick meas
nal
ente
r fre urement
growing rapidly. Information in the quen
cy.
form of 1s and 0s is often transmitted Mea Peak
-T
of pe urement o-Peak
s
as two different frequencies. This is % Pr
obab
ak-t ma D
simp o-peak rkers all eviatio
known as Frequency Shift Keying ility ly on d o
e ha eviation w quick
n
lf th
e pea . Peak d verificat
(FSK), or Gaussian Frequency Shift k-to
-pea
eviat ion
k valuion is
Keying (GFSK) if the data is filtered. e.
In most systems Time Division
Multiple Access (TDMA) techniques
are also used to increase the number
of users on each frequency channel.
This TDMA, or bursting, means that
the transmitter is only on for a few
hundred microseconds at a time.
Problem C
Quic enter F
Measuring the peak deviation and kly v re
as h erify cen quency
center frequency of such signals is alf w ter
"dev ay betw frequen
iatio c
required to meet the regulatory stan- n" pe een the y Freq
uenc
aks.
y
dards. However, measuring the devia-
tion accurately on a bursted signal is
difficult or impossible with conven-
tional modulation analyzers. In addi-
tion, pulse counters only "average"
the frequency within a burst, so the
center frequency value will be a func-
tion of the particular data sequence
transmitted. With wide deviations,
discriminator techniques are cumber-
some. Complete CT2 or DECT trans-
mitter characterization is limited
using conventional test techniques.
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