IZT C3040 Description - ViaLite Communications · 2017-02-15 · 3. Control Software 3.1. Graphical...

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


© 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.


© 2012, IZT GmbH 5 von 15

figure 1: C3040 Digital Processing



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.



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.



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



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.


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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.


© 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),


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


© 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.


14 von 15 © 2012, IZT GmbH

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


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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

IZT C3040 Description - ViaLite Communications · 2017-02-15 · 3. Control Software 3.1. Graphical...

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