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Agilent AN 1200-11
Examine GMSK Modulation in GSM and
PCN Mobile Communications Systems
Application Note
Agilent Technologies 53310A
Modulation Domain Analyzer
Freq
ue ncy
View vs. T
the
of a GMSK m
ime
Freq TDM
A bu odulatio
Prof
ue ncy rst d n ile
irect profile
ly.
Cent
Quic er Fre
freq kly verify quenc
the ency as the cen y
u
peak
-to- the mid ter
peak p
devia oint of
tion
.
Peak
-
Peak to-Pea
mea -to-Peak k Devia
analysured wit deviatio tion
sis f h n
eatu the bu is easil
res. ilt-in y
Bit
Easil Interv
usin y verify al
g th
e timthe bit in Time
e ma t
rkers erval
.
Flexible Modulation Analysis for Solution
GSM and PCN Radios The Agilent Technologies 53310A
Situation Modulation Domain Analyzer with
Current analog mobile communica- Option 031 provides a direct profile
tions systems have reached capacity of modulation in a single TDMA
limits in several large population cen- burst. Measurement markers allow
ters. Future systems will utilize Time you to quickly verify key parameters
Division Multiple Access (TDMA) such as peak-to-peak deviation, cen-
techniques to increase capacity. ter frequency and bit interval.
These new mobile communication
systems employ complex digital mod- Infinite display persistence can be
ulation techniques such as Gaussian used to view an eye diagram of the
Filtered Frequency or Minimum Shift modulated RF carrier. This provides a
Keying to transmit voice and data at quick, qualitative view of modulation
high speeds with low error rates. accuracy. The 53310A provides wire-
Examples of such digital systems are less communication system designers
Groupe Speciale Mobile (GSM), sec- with a general purpose tool to exam-
ond generation digital cordless (CT2), ine modulation performance directly.
and Digital European Cordless
Telephone (DECT).
Problem
These new digital modulation tech-
niques are difficult to characterize
using conventional test equipment.
The burst nature of the TDMA tech-
nique places rigorous requirements
on test equipment. Verifying parame-
ters such as peak deviation, center
frequency and bit interval are critical
to achieving design goals. Fast, direct
views of the modulation are needed
to improve frequency and timing
characterization, and shorten design
cycles.
2
The Modulation Domain gives you a new Related Applications
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