Eight years after introducing the world's first PC telecom
simulator, Tesoft has ported its award-winning TESLA software to
Windows 3.1 and Windows 95. At a desktop price, TESLA 2.0 offers
the latest Windows features such as tool and status bars, balloon
and hypertext help, clipboard, color graphics, fonts and color
printer support. Tesoft backs its products with a 30-day
TESLA lets you simulate modems, synthesizers, spread spectrum and
other telecom systems at the block diagram level. It supports
nonlinear, mixed analog and digital time simulation. Spectrum
analysis is also included.
Simulation begins with drawing a block diagram using OrCAD Capture
for Windows. (Netlist entry is also supported.) TESLA exploits the
Windows environment to offer seamless integration with OrCAD
Capture. For example, you can switch to Capture with one keystroke
and change the diagram. When you save the change and switch back,
TESLA automatically updates the system being simulated.
The Windows interface is also used to full advantage to display
results graphically. After a simulation, you can plot spectra,
waveforms, BER test results, eye-patterns and logic analyzer style
graphs. Multiple plot windows can be open on the screen along with
the OrCAD block diagram. Plot windows remain active. You can zoom-in
by drawing a box with the mouse. Convenient panning and cursor
readout controls are also provided. After plotting a graph that you
want to keep, making a hardcopy, clipboard copy or graphic file is
just a menu-click away.
The new Windows interface features are the main additions in this
version of the simulator, but there have been important
improvements in other areas as well. You can now set important
noise parameters such as C/No, Eb/No, C/N or temperature directly.
Spectrum analysis resolution has been increased by a factor of
sixteen. One handy new feature lets you specify units when entering
model settings. For example, the oscillator model recognizes 63
variations of units for power level. So you can enter a level as
0dBm, 1mW or .6324Vpp and all will result in the same setting. A
new Modeling Wizard feature simplifies the process of adding new
blocks to the simulator. You can use the feature to drop-in an
equation, to add blocks from the TESLA BBS or to create their own
new blocks. TESLA for Windows remains compatible with block
diagrams, netlists, macros and simulations saved from previous
The example simulation shown in the figure is a 100kb/s FSK spread
spectrum transmitter and receiver operating at 918.4MHz. The
chipping rate is 1Mb/s. Multipath interference is included. Half of
the bandpass spread spectrum is shown at the right. The center
frequency is at the left axis, where the multipath notch suppresses the
area around the carrier frequency. The de-spread half-spectrum is
Although the multipath notch has removed a large
portion of the center of the signal, the carrier envelope holds up
...and the eye pattern shows usable data. A 100kb/s FSK
simulation without spreading showed no discernible eye pattern.
The conclusion: TESLA 2.0 for Windows easily models complex
transmission effects such as the ones which give spread spectrum an
advantage in multipath transmission.
Requires Windows 3.1 or 95. Includes a 30-day satisfaction
guarantee: full refund less shipping. Price: $995-1999, depending
on options; Delivery: Two weeks ARO.
205 Crossing Creek Ct.
Roswell, GA 30076
E-mail: Formerly email@example.com
Web: formerly at http://www.tesoft.com
OrCAD is a registered trademark of OrCAD, Inc. Windows is a registered trademark of
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