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Kwan's PIT Project
Modeling EM waves using cellular automata Can cellular automata models be used to analyze EM propagation behaviors in building with multipath propagations? I would like to understand how much wireless data rate dense radio environments could support. I am considering an area like the Media Lab cube where every single item in the area has an RF connection with people carrying around devices like mobile phones that may also relay RF signals. I would like to understand how EM waves behave and propagate in such environments by modeling them in numerical simulators. Such invesgtigation will allow how much data rate can be consistently supported in such environments and what kind of multiple access mechanism could be used for all the distributed radios to constantly communicate with each other. Goal For the PIT class, my goal is to understand how EM modeling works and build a simple cellular automata based EM modeler that can model simple EM waves and dipoles.
Understand how FDTD and LGA models work - Open source simulators can be found at fdtd.org. Meep uses scheme interface and was created at MIT.
- EM Solver Background
Implement a CA model - Simple wave propagation LGA wave
- For simple dipole propagation
- Differing boundary conditions Square center, Slit
- For multiple sources of radio
Prove that it models Maxwell's equations - Hint: Simple Lattice Gas Models for Waves [Chen, Chen, Doolen, Lee]
- There must be + and - particles that cancel each other when they meet.
- Total wave energy and total wave momentum needs to be conserved.
- Speed cannot exceed
*c*. - Linear wave equation is recovered after making an ensemble averaging and a Taylor expansion in time and space.
References A Lattice Gas Automaton Capable of Modelling 3D-EM Fields Integer Lattice Gas Automata for Computational Electromagnetics Extremely Low-Precision Integer Cellular Array Algorithm for Computational Electromagnetics Application of Cellular Automata to Modeling Mobility and Radio Communication in Wireless Networks Cellular Automata Methods in Mathematical Physics Integer Lattice Gases at Equilibrium Cellular Automata Theory and Physics: A new Paradigm for the Unification of Physics Statistical Mechanics and Cellular Automata Cellular Automata and Discrete Physics Book: Microwave Circuit Modeling Using Electromagnetic Field Simulation [Swanson, Hoefer] Book: Lattice Gas Methods for Partial Differential Equations [Ed. Doolen] Microwave Circuit Modeling Using EM Field Simulators UMR EMC LAB: Commercial EM Codes EM Simulators Reveal Contents Of Crystal Ball |
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