Time Reversal with Single Antenna Systems in Indoor Multipath Environments

  • Zhengqing Yun
  • Magdy F. Iskander

The time reversal (TR) technique has been well investigated for sound wave applications. Recently, the same idea has been extended to telecommunications and the electromagnetic waves. Lerosey, et al., reported that the spatial focusing and time compression were experimentally achieved in a reverberant chamber with a one transmit and one receive antenna system (1 x1 antenna system). TR has also been employed in other areas of research, e.g., the imaging of targets in complex environments6,7 and microwave nulling

This research focuses on the characterization of TR with single antenna systems. To achieve energy focusing using a single antenna system, wideband signals and multipath environments are required. We examine the TR property 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 signal waveform is a wideband monocycle. The two-dimensional finite-difference time-domain (FDTD) method is employed for the simulation of the wave propagation in an indoor environment. The effect of furniture and other scattering objects in the region of interest is investigated. To quantitatively characterize the spatial energy focusing, a spatial energy focusing factor (SEF) is defined. It is found that spatial energy focusing can be achieved in the indoor environment and that the scatterers can significantly improve the spatial energy focusing.


Indoor Environment Time Reversal FDTD Method Wideband Signal Multipath Environment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Derode, A. Tourin, and M. Fink, Random multiple scattering of ultrasound. I. Coherent and ballistic waves, Physical Review E, 64, 036605-~7 (2001).CrossRefADSGoogle Scholar
  2. 2.
    Derode, A. Tourin, and M. Fink, Random multiple scattering of ultrasound. II. Is time reversal a self-averaging process? Physical Review E, 64, 036606-1~13 (2001).CrossRefADSGoogle Scholar
  3. 3.
    G. Montaldo, G. Lerosey, A. Derode, A. Tourin, J. de Rosny, and M. Fink, Telecommunication in a disordered environment with iterative time reversal, Waves in Random Media, 14, 287-302 (2004).CrossRefADSGoogle Scholar
  4. 4.
    G. Lerosey, J. de Rosny, A. Tourin, A. Derode, G. Montaldo, and M. Fink, Time reversal of electromagnetic waves, Physical Review Letters, 92 (19), 193904-1~3 (2004).CrossRefADSGoogle Scholar
  5. 5.
    L. Borcea, G. Papanicolaou, C. Tsogka, and J. Berryman, Imaging and time reversal in random media, Inverse Problems, 18, 1247-1279 (2002).zbMATHCrossRefMathSciNetADSGoogle Scholar
  6. 6.
    C. Oestges, A. D. Kim, G. Papanicolaou, and A. J. Paulraj, Characterization of space-time focusing in time-reversed random fields, IEEE Trans. Antennas Propag., 53 (1), 283-293 (2005).CrossRefMathSciNetADSGoogle Scholar
  7. 7.
    D. Liu, G. Kang, L. Li, Y. Chen, S. Vasudevan, W. Joines, Q. Liu, J. Krolik, and L. Carin, Electromagnetic time-reversal imaging of a target in a cluttered environment, IEEE Trans. Antennas Propag., 53 (9), 3058-3066 (2005).CrossRefADSGoogle Scholar
  8. 8.
    A. G. Cepni, and D. D. Stancil, Single antenna microwave nulling using time-reversal techniques, Proceedings of IEEE IMS’05, 1723-1726 (2005).Google Scholar
  9. 9.
    Z. Yun, Z. Zhang, and M. F. Iskander, A Ray-Tracing Method Based on Triangular Grid Approach and Application to Propagation Prediction in Urban Environments, IEEE Transactions on Antennas and Propagation, 50 (5), 750-758 (2002).CrossRefADSGoogle Scholar
  10. 10.
    A. Taflove, and S. C. Hagness, Computational Electrodynamics, the Finite-Difference Time-Domain Method, (Artech House, Boston, 2000).zbMATHGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Zhengqing Yun
    • 1
  • Magdy F. Iskander
    • 1
  1. 1.Hawaii Center for Advanced CommunicationsUniversity of HawaiiHonoluluUSA

Personalised recommendations