Abstract
Embedded-computing systems tend to be composed of subsystems with very different characteristics. Their Heterogeneity puts high demands on design and simulation tools. Ptolemy project address the problem by hierarchical heterogeneity. The design principles are demonstrated in the Ptolemy II software that advocates an actor-oriented design methodology, and uses different models of computation, which can be used to capture different design perspectives, to manage the interaction of different actors, and hierarchically integrates multiple models of computation to simulate each aspects of systems, which achieves a more realistic simulation.
At first, I will introduce the system-level design of embedded systems and some background knowledge.
The second, I will describe the embedded systems modeling and simulation environment Ptolemy II, and then provide something simply about domains involved in this experiment.
The third, I will give a means to add an actor in Ptolemy II, and then design a group of actors about chaotic spread spectrum DS-CDMA systems by using the above means.
At last, I will discuss how to use the actors that the Ptolemy II provided and designed above to model and simulate in chaotic spread spectrum DS-CDMA systems, and then explain the results of the experiment.
Key words: System-level Design; Heterogeneity; Ptolemy II;Chaotic