ETTC'2003 - SEE

Figure 3 : Graphic User Interface of JUZZLE for a
study case
PHYSICAL LAYER SIMULATION
WITH JUZZLE
MODULE APPROACH
In order to ensure independence between
modules, a strategy has been established for
data communications: Each module intends to
operate a specific function of the transmission
chain. The modules are then called
successively and iteratively.
To implement a module, the user has to
declare in a specific window:
- Includes, defines, external libraries needed
for algorithm codes
- Global variables that are kept during all the
simulation
- Data intended to be exchanged via input and
output ports
- Parameters and results associated to the
module
Graphic User Interface of JUZZLE for
module declaration is as follows
Figure 4 : User interface for module declaration
Afterward, the algorithms are written using
three different functions:
- Preparation : This function is called at
simulation start in order to initialise each
module. For instance, for a filter, some
coefficients are computed before any
processing and kept between successive
calls.
- Process : This function is called as many
times as necessary. The skeleton for this
function is always the same : first, analysis
of data amount available at input (if any)
and free space at output, second, decision
if computation can be performed and
third, production of new data to output
ports.
- Termination : This last function is called
when simulation is finished to allow each
module to build synthesis results or to
clean resource (memory de-allocation for
instance).
BUFFER MANAGEMENT
For being able to perform computation,
module needs data from input buffer(s) and
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