Time reversal with single antenna systems in indoor multipath environments: spatial focusing and time compression

This research focuses on the characterization of time reversal (TR) technique in indoor multipath environments which have typical propagation features such as the waveguide effect of hallways, multiple reflection and transmission of slab walls, diffraction from edges (especially metal edges), and scattering from various small structures. The two-dimensional FDTD method is employed for the simulation of the wave propagation. An indoor environment is simulated and the effect of furniture and other scattering objects in the region of interest is examined. To quantitatively characterize the spatial focusing and time compressing, the spatial energy focusing factor (SEF) and the time compressing factor (TCF) are defined. It is found that energy focusing and time compressing can be achieved in the indoor environment and scatterers such as metal door frames can significantly improve the focusing and compression effects.