I/Q Modulation Generator R&S AMIQ
New approaches in the generation of complex I/Q signals
◆ 14-bit resolution
◆ 16 000 000 sample memory depth
◆ 100 MHz sample rate
◆ 78 dB ACP dynamic range
(typical of 3GPP FDD)
◆ Integrated hard disk and
floppy disk drive
◆ Optional BER measurement
(R&S AMIQ-B1)
◆ Optional differential I/Q outputs
(R&S AMIQ-B2)
◆ Optional digital I/Q output
(R&S AMIQ-B3)
The ultimate in I/Q signals
Modulation Generator
R&S AMIQ
◆ 100 MHz clock rate per channel
◆ Up to 16000000 samples per
channel
◆ Generation of broadband digital
communication signals (e.g.
WCDMA, HIPERLAN2 and
IEEE802.11a)
◆ Built-in hard disk for storage of
calculated signals
◆ Downloading of calculated
waveforms and signals also from
integrated floppy disk drive
◆ Antialiasing filter featuring
excellent frequency response and
group delay
◆ Auto-alignment and additional
user correction of amplitude and
offset
◆ Fine adjustment of I/Q skew
◆ Wide dynamic range through the
use of 14-bit D/A converter, ideal
for multicarrier applications
◆ Excellent ACP (adjacent-channel
power) values with WCDMA 3GPP
FDD signals of typically –78 dBc
for test model 1 with 64 channels
An ideal pair: R&S AMIQ and
R&S WinIQSIM™
The number of systems based on complex
digital modulation methods has dramatically increased in every field of communications. I/Q modulation is therefore gaining importance for the development of
such modulation methods. The Modulation Generator R&S AMIQ and the Simulation Software R&S WinIQSIM™, which
is described in a separate data sheet
(PD 0757.6940), open up new dimensions
for the generation of I/Q signals.
The R&S AMIQ is a dual-channel modulation generator that has especially been
designed for use as an I/Q source. It is
programmed and set with R&S
WinIQSIM™. Alternatively, the R&S
AMIQ can be operated from the Vector
Signal Generator R&S SMIQ.
Of course, the R&S AMIQ features full
remote-control capabilities via the
GPIB/IEEE and RS-232-C interfaces.
Each channel can store up to 16 000000
samples. Sequences of sufficient length
can thus be generated even at high symbol rates. Featuring clock frequencies of
up to 100 Msample/s and a high ampli-
tude resolution of 14 bit at the analog signal output and up to 16 bit at the digital
signal output, the R&S AMIQ is the ideal
source for any digital modulation signal.
An automatic amplitude/offset alignment
as well as fine adjustment of the skew
provide excellent symmetry of the two
channels which previously was extremely
difficult to attain with dual-channel ARB
generators. The error vector is thus minimized.
The filters have been optimized regarding
group delay, frequency response and
matching between the two channels for
use as an I/Q modulation source.
Typical applications of the R&S AMIQ and
R&S WinIQSIM™ not only include driving
the I/Q inputs of a vector signal generator; the combination is also ideal for direct
applications in the baseband, such as
testing I/Q modulators/demodulators.
The digital signal output (option R&S
AMIQ-B3) opens up further applications
in the baseband: digital/analog converters (DACs) or digital input base stations
can be tested, for example.
2 I/Q Modulation Generator R&S AMIQ
Simulation Software
R&S WinIQSIM™1)
◆ Single-carrier signals
◆ Multicarrier signals (up to
512 modulated or unmodulated
carriers)
◆ Multicarrier mixed signals (up to
32 differently modulated carriers)
◆ User-defined CDMA signal
scenarios
◆ Addition of impairments
◆ Data editor for creating any TDMA
frame configuration
◆ Predefined files for TDMA mobile
radio standards (GSM, GSM-EDGE,
DECT, NADC (IS54C/IS136), PDC,
and test models 1 to 4 for WCDMA
3GPP FDD)
◆ IF signal calculation
◆ Graphic display of calculated sig-
nals (constellation diagram, vector
diagram, i(t)/q(t), magnitude and
phase, eye pattern, spectrum, etc)
◆ Remote control of the R&S AMIQ
◆ The import system allows data
from other software programs to
be read in via the TCP/IP and DDE
interfaces
Versatile to the last detail
R&S WinIQSIM™ is a Windows software
program for calculating I and Q baseband
signals. Its functionality ranges from
single-carrier modulation, generation of
multicarrier, CDMA and WCDMA signals
through to TDMA frame configuration
with the help of a convenient data editor.
All modulation parameters and impairments can be simulated for single-carrier,
multicarrier as well as for CDMA signals.
To put it in a nutshell: R&S WinIQSIM™ is
an indispensable tool for anyone
engaged in modern digital modulation.
This Windows software enables the R&S
AMIQ to simply generate complex modulation signals. This includes modulation
signals for WCDMA 3GPP, which is similar
to QPSK, or 8PSK EDGE modulation with
3π/8 shifting for the EDGE enhancement
in the GSM standard. OFDM, which is
used for HIPERLAN/2, and where a data
stream is transferred via a large number
of carriers, is a special modulation format.
For generating this type of signal, the R&S
WinIQOFDM software (see www.rohdeschwarz.com) is used.
1)
For more details see data sheet PD 0757.6940.
I/Q Modulation Generator R&S AMIQ 3
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