METHODS FOR SYSTEM SPECIFICATION AND VALIDATION
273
DSP Subsystem
Transmitter
Channel
RF Subsystem
Transmitter
DSP Subsystem
Receiver
System Level Simulator
Inter
face
Inter
face
Inter
face
Analog
Simulator
Inter
face
System Level Simulator
Figure 12-1. File coupling of simulators
12.3
Direct Cosimulation of System Level and Analog
Simulators
In contrast to file coupling, in this solution different simulators are
running simultaneously in direct cosimulation. This allows feedback loops
between subsystems modeled in different simulators. The communication
between the tools is usually realized by sockets or shared memory. For
shared memory coupling both tools are executed on the same host. Socket
connection allows the communication between tools on the same or different
host in a computer network.
The implementation of a simulator coupling requires some experience in
simulation and software programming. The coupling is sometimes provided
by the simulator vendors. Otherwise it can be implemented by the user if
both simulators have an interface for C-coded models. A C-coded interface
model can then be used to exchange the data with the corresponding
interface model in the other simulator. The principle of direct cosimulation is
shown in Figure 12-2.
The system level simulation is a time domain analysis. It corresponds to
the transient analysis of analog simulators. By coupling both simulation
algorithms the time points for data exchange must be synchronized. System
simulators use a discrete time scale, while analog simulators use a time
continuous signal representation.
Summary :
METHODS FOR SYSTEM SPECIFICATION AND VALIDATION 273 DSP Subsystem Transmitter Channel RF Subsystem Transmitter DSP Subsystem Receiver System Level Simulator Inter face Inter face Inter face Analog Simulator Inter face System Level Simulator Figure 12-1.
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simulators,simulator,coupling,system,time,analog,leel,face,inter,both,interface,tools,between