In this paper, we describe a simulation environment which is used to examine, validate, and predict the performance of mobile wireless network systems. This simulation environment overcomes many of the limitations found with analytical models, experimentation, and other commercial network simulators available on the market today. This paper describes the simulation language, Maisie, which is used to analyze the performance bottlenecks of a multimedia wireless network system being developed at UCLA. By modeling the various components and their integration, this simulation environment is able to accurately predict the performance bottlenecks of the UCLA wireless multimedia networking terminal, determine the trade-off point between the various bottlenecks, and provide performance measurements which are not possible through experimentation and too complex for analysis.