I/Q Modulation Generator AMIQ
New approaches in the generation of complex I/Q signals
◆ 14-bit resolution
◆ 4 000 000/16 000 000 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
(AMIQ-B1)
◆ Optional differential I/Q outputs
(AMIQ-B2)
◆ Optional digital I/Q output
(AMIQ-B3)
The ultimate in I/Q signals
Modulation Generator 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 excel-
lent 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:
AMIQ and 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 AMIQ and the Simulation
Software WinIQSIM™, which is
described in a separate data sheet
(PD 0757.6940), open up new dimensions
for the generation of I/Q signals.
The 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 WinIQSIM™.
Alternatively, the AMIQ can be operated
from the Vector Signal Generator SMIQ.
Of course, the AMIQ features full remotecontrol 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 amplitude resolution of 14 bit at the analog signal output and up to 16 bit at the digital
signal output, the 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 AMIQ and
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
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 AMIQ
Simulation Software
WinIQSIM™ *)
◆ 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 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
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: WinIQSIM™ is an
indispensable tool for anyone engaged in
modern digital modulation.
This Windows software enables the
AMIQ to simply generate complex modulation signals. This includes modulation
signals for WCDMA 3GPP, which is similar
to QPSK, or 8PSK EDGE modulation with
3
π/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
WinIQOFDM software (see www.rohdeschwarz.com) is used.
*) For more details see data sheet PD 0757.6940.
I/Q Modulation Generator AMIQ 3
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