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IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH i
IZT C3040
Description
Version 1.00
IZT C3040 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
ii © 2012, IZT GmbH
Date Version Description Author
2012-04-08 1.00 Initial version pth
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH iii
1. Introduction ........................................................................................................ 4
2. Functionality ....................................................................................................... 6 2.1. Digital Processing................................................................................................. 6 2.1.1. Delay.................................................................................................................. 6 2.1.2. Ionosphere.......................................................................................................... 6 2.1.3. IMUX and OMUX Filters........................................................................................ 7 2.1.4. Noise and Interference ......................................................................................... 8 2.1.5. IF Filter Simulation ............................................................................................... 8 2.1.6. Phase Noise ........................................................................................................ 8 2.1.7. Nonlinearity ........................................................................................................ 9 2.1.8. Fading ...............................................................................................................10
3. Control Software ................................................................................................11 3.1. Graphical User Interface ......................................................................................11 3.1.1. Analog Modulation and Broadcast ........................................................................11 3.1.2. Real-time Modulation .........................................................................................11 3.1.3. Communication Standards ...................................................................................11 3.1.4. Frequency Hopping Module .................................................................................13 3.2. Remote Control ..................................................................................................13
4. Specifications .....................................................................................................14 4.1. Supply Voltage ...................................................................................................14 4.2. Mechanical characteristics ...................................................................................14 4.3. Environmental specifications................................................................................14
IZT C3040 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
4 von 15 © 2012, IZT GmbH
1. Introduction
The channel simulator IZT C3040 is the successor of the IZT DCS3020. It offers a higher
instantaneous bandwidth of 100 MHz, more flexibility in terms of RF modules and an enhanced
feature set.
The available features were grouped into uplink, payload and downlink effects. Some features are
available twice to reproduce a realistic transmission chain. The following impairments are available
to the user.
Effects of the uplink include:
� Delay and delay change over time
� Doppler simulation
� Effects of the ionosphere
� Interference by other signals
Within the payload of the satellite the following effects are introduced:
� IMUX filtering
� Nonlinearity (AM/AM and AM/PM) caused by the amplifier
� Phase noise
� OMUX filtering
On the downlink, from the satellite to the terminal the signal then changes by:
� Effects of the ionosphere
� Large and small scale fading
� Interference by other signals
� Thermal noise
Due to its sophisticated auto-calibration and high-performance RF converter, which it shares with
IZT's high performance receivers and signal sources the IZT C3040 features an excellent signal
quality.
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH 5 von 15
figure 1: C3040 Digital Processing
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
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2. Functionality
2.1. Digital Processing
The IZT C3040 uses modern FPGA technology to perform the digital signal processing. After
digitization with 320 MSsamples/sec. the signal is converted to complex baseband and subsequent
processing is done at 160 MSamples/sec. (complex). To account for spectral re-growth, the
nonlinearity simulation is performed to 320 MSps.
2.1.1. Delay
The IZT C3040 can simulate a continuously variable delay of up to 800 milliseconds. After an initial
setting, it s variation is tied to the Doppler simulation of the link. It is continuously variable to
simulate actual satellite movement. Variations will resemble a linear increase of distance between
transmitter and receiver.
2.1.2. Ionosphere
As an option, the C3040 provides a simulation of the time-dispersive effect of the ionosphere both
on uplink and downlink. It is controlled by the user specifying the Total Electron Content and the
actual frequencies used on uplink and downlink. The conditions of the ionosphere can be altered
while the simulation is running.
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH 7 von 15
figure 2: IZT C3040 Gain and Group Delay Flatness
figure 3: Emulation of the Ionosphere with IZT C3040
2.1.3. IMUX and OMUX Filters
The IZT C3040 provides two FIR filter with 128 complex, non-symmetric coefficients each to simulate
the satellite IMUX and OMUX filters. The user may either specify the filter coefficients directly or
provide a complex frequency responses, which will be transformed into a FIR filter by the C3040
control software.
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
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IMUX and OMUX are independent and assumed to be fixed during the simulation.
figure 4: IZT C3040 MUX Filter
2.1.4. Noise and Interference
Behind the IMUX filter and at the very end of the simulation chain, two independent noise sources
and two independent arbitrary waveform generators are available. The power spectral density of
the noise source can be controlled by the user as a function of frequency. In order to set a defined
C/N, a power detector measures the signal power passing through the IMUX filter.
The arbitrary waveform generator holds up to 1 GByte (256 Megasamples) of data. Its output power
is adjustable. The sample rate is variable up to the full bandwidth of the IZT C3040.
2.1.5. IF Filter Simulation
The IZT C3040 can be equipped with an additional FIR Filter (complex, non-symmetric) with 4096
coefficients. The impulse response has a maximum duration of 25.6 usec. It can be used to model
analog distortions in the payload IF filter, for example triple transit in a surface acoustic wave filter.
2.1.6. Phase Noise
The IZT C3040 supports an accurate phase noise simulation with up to 10 MHz bandwidth. The user
can specify a desired frequency response or mask which will the be pre-calculated. The total (RMS)
phase modulation is adjustable during the simulation. Phase Noise
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH 9 von 15
The IZT C3040 can simulate the phase noise introduced by the local oscillator in the satellite. The
user has to specify a “mask” (noise power density vs. frequency) and can then adjust the amount of
phase perturbation introduced by the simulator. As an example, the phase noise profile for “DVB-S2
typical“ is shown in figure 5.
Required phase noise mask:
-25 dBc/Hz @ 100 Hz
-50 dBc/Hz @ 1 kHz
-73 dBc/Hz @ 10 kHz
-93 dBc/Hz @ 100 kHz
-103 dBc/Hz @ 1 MHz
-114dBc/Hz @ >10 MHz
figure 5: Measurement result of simulated phase noise “DVB-S2 typical”
2.1.7. Nonlinearity
The IZT C3040 can simulate a memoryless distortion (AM/AM and AM/PM) as it would be
introduced by the amplifier in the payload. The user specifies the data as complex gain versus input
power in tabular format.
The nonlinearity table contains 1024 complex coefficients as a function of amplifier input power.
Linear interpolation is used between adjacent table entries. RMS and peak power detectors at the
input and output of the nonlinearity simulation give the user the necessary feedback about the
current operating point of the nonlinearity simulation.
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
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figure 6: Emulation of Payload Nonlinearity
2.1.8. Fading
To simulate rain fades or scintillation, the IZT C3040 has the capability to weigh the signal with a
complex fading coefficient which is continually streamed from RAM or the control software.
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH 11 von 15
3. Control Software
3.1. Graphical User Interface
For the different markets, IZT is offering different tools for generating test files and controlling the
S1000.
3.1.1. Analog Modulation and Broadcast
The offline IZT IQ Generator Toolbox generates test files for all major broadcast standards:
� FM-RDS
� AM
� DAB / DAB+
� DVB-T
� DMB
� DRM/ DRM+
� HDRadio
Input data can be a full multiplex or raw content material.
3.1.2. Real-time Modulation
Real-time modulation has been implemented for SiriusXM Satellite Radio, generating six QPSK and
two COFDM modulated signal simultaneously.
3.1.3. Communication Standards
For applications in COMINT/SIGINT, typical communication signals are supported:
� ASKn,
� PSKn (single and multi channel),
� QAMn (single and multi channel),
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
12 von 15 © 2012, IZT GmbH
� ASKnPSKm (single and multi channel)
� NCPFSKn
� FSKn (single and multi channel)
� MSK (single and multi channel)
� GMSK (single and multi channel)
� F7B
� TFM3
� TFM5
� AM, NFM, SSB (from .wav files)
Signal parameters can be selected by the user:
� Attenuation
� Center Frequencies
� Baud Rates
� Degree / subtypes /version
� Pulse shapes (RC, RC/RRC, Gauss)
� Burst Parameters
Different coding schemes are available:
� Binary, Baudot, ASCII, HC ARQ, ITA2
� Differential/absolute coding
� Convolutional encoding
� CCITT standards V.17…V.33
� variable bit stream, bit order, parity
� various scrambling algorithms
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH 13 von 15
3.1.4. Frequency Hopping Module
The Frequency Hopping Module utilizes the profile functionality of the S1000 to generate hopping
networks in a very efficient manner. The content is supplied by the user as narrow band IQ data.
� Spread: up to 120/240MHz
� Hop rate: >2000 hops/sec.
� Channel spacing: user settable
� Pattern: regular or random within user-defined channel list or sequence of channels /
frequencies defined by user
� Number of hoppers: up to 31. One hopper requires one VSG (two VSGs with 240MHz spread).
� Content: IQ-data, generated by Analogue Modulation Tool or user-supplied content
The IZT C3040 has an easy to use graphical user interface which can be operated on the built-in
front panel display or remotely on an external PC.
figure 7: Top level GUI page
3.2. Remote Control
All commands, settings and parameters accessible via the C3040 GUI can also be controlled
remotely via SCPI commands. The GUI will reflect any changes while they occur.
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
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4. Specifications
4.1. Supply Voltage
Input voltage range 100 VAC … 240 VAC
Maximum input current 4.0 A (100V)
AC supply frequency 46 Hz to 60Hz
Input current in standby operation 0.1 A (100V)
Table 1 – Supply Voltage specifications
4.2. Mechanical characteristics
Width 482 mm
Depth 569 mm
Height 132 mm
Weight 14 kg
Table 2 – Mechanical characteristics
4.3. Environmental specifications
Ambient temperature range
Operation
0 °C … 50 °C
IZT S1000 Version: 1.00 Description Date : 2012-04-08 C3040_Description-V1_0.doc by Rainer Perthold
© 2012, IZT GmbH 15 von 15
Ambient temperature range
Storage
-40 °C … 70 °C
Humidity
operation: 5 % … 95 % non-
condensing
storage: 5 % … 99 % non-condensing
Altitude range (m)
Operation
2000 m
Table 3 – Environmental specifications