VisSim/Comm:
Signal
Processing & Communication System Design
Adaptive equalization compensating for channel distortions in a 16-QAM
comms link |
Based on the core VisSim engine, VisSim/Comm is used for the modeling
and simulating end-to-end communication systems at the signal or physical
level. With a full complement of communication blocks and a powerful,
time-domain simulation engine, VisSim/Comm provides fast and accurate
solutions for analog, digital, and mixed-mode communication system designs.
The communication block set includes RF, UWB, Bluetooth, 802.x, Turbo
Codes, BPSK, QPSK, DQPSK, QAM, BER, Eye Diagram, Viterbi, and Reed-Solomon.
Using VisSim/Comm, you can freely move among the stages of model construction,
simulation, optimization, and validation. This tightly integrated development
platform allows you to simulate and view signal waveforms at any stage
of the communication system chain. And all modeling and simulation tasks
can be completed without writing a line of code. In short, VisSim/Comm
makes it easy to build, modify and maintain even the most complex system
models. Ericsson Inc., a leading developer and manufacturer of cellular
and PCS consumer electronics, has been using VisSim/Comm for years in
their research and development efforts.
Transmitter and Receiver Models
Communication system design can be divided into two categories: transmitter
design and receiver design. VisSim/Comm lets you build both transmitter
and receiver models, from a first principles perspective, by simply selecting
and connecting predefined blocks. You 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.
Encoders and RF Components
For 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 that require the modeling of RF components, VisSim/Comm provides
models for amplifiers, mixers, splitters, attenuators, couplers, and
switches, including noise figure and nonlinear effects.
Channel Distortion
Fading and Echos
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:
- AWGN (real and complex, scalar and vector)
- Binary Symmetric
- Jakes Mobile
- Rummler and standard Multipath
- Propagation loss
- Rice/Rayleigh Fading
- Saleh-Valenzuela (real and complex)
- TWTA (calculated and table lookup)
You can modify VisSim/Comm block parameters to suit their specific system.
You can also create custom models by forming new compound blocks or developing
custom blocks using the built-in VisSim block wizard. |
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