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Product Name: VisSim/Comm
Product Description
Application Brief
VisSim/Comm lets you model
end-to-end communication systems at the signal or physical
level. With a full complement of high level communication blocks
and powerful simulation engine, VisSim/Comm provides fast and
accurate solutions for analog, digital, and mixed-mode
communication systems. Moreover, VisSim/Comm’s intuitive block
diagram interface makes it easy to build, modify, and maintain
the most complex system models. By using advanced, complex
envelope techniques, simulations speeds are up to 40 times
faster than competing products.
Using VisSim/Comm, engineers can move easily among the stages of
model construction, simulation, optimization, and validation.
You can simulate and view signal waveforms interactively at any
stage of the communication system chain. All modeling and
simulation tasks can be completed without writing a line of
code.
VisSim/Comm’s unique combination of
power and ease-of-use enables the rapid prototyping of
communication systems.
Transmitter and Receiver Models
Communication system design can be
divided into two categories: transmitter design and receiver
design. VisSim/Comm lets engineers build both transmitter and
receiver models, from a first principles perspective, by simply
selecting and connecting predefined blocks. Engineers can
construct a wide range of models including analog, digital and
mixed mode designs, and quickly simulate their behavior. The
VisSim/Comm block set provides a variety of modulators and
demodulators, including standard analog, PSK, QAM and
differential formats. Full support is also provided for the
design of phase locked loops, including loop filter and VCO
elements.
For those designs where encoding is required, VisSim/Comm
supports both convolutional and trellis-based codes, such as the
V.32 modem specification. In addition, for designs which require
the modeling of RF components, VisSim/Comm provides models for
amplifiers, mixers, splitters, attenuators, couplers and
switches which include noise figure and non-linear effects.
Channel Models
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VisSim/Comm includes a variety of
predefined channel models supporting both fixed and mobile
service scenarios. Included are fading, multipath, bandlimited,
and gaussian noise models. In each case, as with all VisSim/Comm
blocks, engineers can modify model parameters to suit their
specific needs. Engineers can also create custom models by
forming new compound blocks or developing custom C code
implementations.
Filter and Equalizer Design
VisSim/Comm supports a wide range of customizable filters, including FIR, IIR, gaussian, raised cosine and root raised cosine filters. Engineers can also specify a look-up table-based filter by providing measured gain and phase data. Additional blocks, such as the complex FFT block, make it easy to view gain and phase responses of any filter. Furthermore, for designs that require adaptive filters, fractionally-spaced LMS equalizer blocks are included.
Predicting System Performance
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Once designed, a
transmitter or receiver model can be simulated to
determine its performance under a variety of operating
conditions. VisSim/Comm’s highly interactive interface
makes it easy to perform “what if” simulations and
carry out performance trade-offs. For example, a user
can dynamically change one or more parameters, for
example Signal to Noise Ratio (SNR), and VisSim/Comm
will immediately display the corresponding changes in
system behavior.
Engineers have full control over most simulation
parameters, including start and end times and the
simulation sampling frequency. Simulations can be set up
to run in interactive, batch or single step modes, and
can be paused or stopped based on simulation event
conditions.
Complete end-to-end performance of a system can be
determined by linking together transmitter, receiver and
channel models. Simulation results can be instantly
visualized in BER plots, phase scatter plots, eye
diagrams, spectral plots and other visual outputs.
The models can then be refined until they accurately
reflect the desired behavior. In the case of a
transmitter design, this might involve compliance with a
specified FCC spectral mask or operating within an
output linearity specification. In the case of a
receiver design, the goal might involve achievement of a
target BER performance at a specified Eb/No level, or
verification that a carrier tracking loop can acquire
the signal of interest over a specified frequency range.
Additional Features
Because most modulators, channel models, and demodulators can operate in complex math notation (I & Q), VisSim/Comm supports the implementation of lowpass equivalent models, which can result in a significant reduction in simulation time compared to conventional approaches.
For large project design, VisSim/Comm offers hierarchical modeling and embedded compound blocks. Hierarchical modeling facilitates the readability and maintenance of system models, while embedded compound blocks automate the process of making global changes to the models.
VisSim/Comm includes the VisSim Viewer, a run-time view-only version of VisSim that enables users to distribute VisSim models to colleagues and clients. A selective password protection scheme is available for limiting access to proprietary information. Diagram statistics and revision history make it easy to track project development, especially across large, multi-platform groups. Finally, there is virtually no limit to model size or complexity as VisSim/Comm supports over five million blocks per diagram.
Options
Automatic C Code Generator: VisSim/C-Code generates customizable ANSI C code directly from VisSim diagrams.
Rapid Prototyping of DSP & Embedded Systems: VisSim/CommDSP is a completely integrated Windows program for the rapid prototyping of communication systems targeted for DSP ( Digital Signal Processor ) and embedded systems. It automatically generates C code for all or part of your VisSim diagram, compiles and downloads it to the target DSP.
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