The latest communication technologies invariably consist of modules with dynamic behavior. There exists a number of design tools for communication system design with their foundation in dataßow modeling semantics. These tools must not only support the functional speciÞcation of dynamic communication modules and subsystems but also provide accurate estimation of resource requirements for efÞcient simulation and implementation. We explore this trade-off Ñ between ßexible speciÞcation of dynamic behavior and accurate estimation of resource requirements Ñ using a representative application employing an adaptive modulation scheme. We propose an approach for precise modeling of such applications based on a recently-introduced form of dynamic dataßow called core functional dataßow. From our proposed modeling approach, we show how parameterized looped schedules can be generated and analyzed to simulate applications with low run-time overhead as well as guaranteed bounded memory execu...