The Communications Adaptive Design and RFI Environment (CADRE) Tool for Radio System Design

D.A. Liedman, M.A. Nguyen, and L. Monticone (USA)


: RFI, Spectrum Management, Universal Access Transceiver, UAT, FAA, Simulink, L-band


. The Federal Aviation Administration (FAA), Department of Defense (DoD), and international civil aviation authorities are concerned that the expanded use of communication systems operating in the 960-1215 megahertz (MHz) band poses a potential threat of increased mutual radio frequency interference (RFI) among government systems, and out-of-band interference from commercial systems. The MITRE Corporation's Center for Advanced Aviation System Development (MITRE/CAASD) believes that an effective way to analyze and understand the various aspects of this problem is through a software tool suite that can be used to emulate the various systems, environments, and RFI mitigation strategies. Last year MITRE/CAASD has been assembling and updating existing tools for a tool suite, built on a variety of platforms, to address certain immediate concerns. As part of the tool suite development, MITRE/CAASD has been exploring the use of Simulink from MathWorks, Inc. for building high fidelity simulation models on a single platform that could help address efficient spectrum use in this band. The portion of the tool suite constructed this year using Simulink is called the Communications Adaptive Design and RFI Environment (CADRE) Tool. This paper focuses on the methodology of constructing a model that can simulate the complex RFI environment and its effects on systems in that environment. The CADRE Tool consists of two parts, a detailed model of the system under analysis, and a broadcast network environment. The broadcast network model simulates an aggregate of radio models according to their channel access scheme. The radio system model considered is that of the Universal Access Transceiver (UAT), a system that the FAA is developing for broadcast services. A large portion of the RFI environment includes self-interference, caused by similarly equipped aircraft. This paper presents performance results obtained from simulations based on the Los Angeles (LA) Basin 2020 Model which contains nearly 3,000 simulated aircraft, all assumed to be UAT equipped in the simulation. The results were compared against laboratory measurements in order to validate the model.

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