Wireless communication in cluttered environments based on time
reversal principle (sponsored by NSF and ONR)
Back to Research Main
Summary
Wireless communication in unknown and cluttered environments is an
important problem which has several practical applications, such as
communication in urban areas and disaster areas. This project
investigates a method to maximize power transfer efficiency for
communication in such environments. The method applies to communication
between a transmitting array and a receiving array where the
transmitting array sends out a probe signal, and at the receiving
array, the transfer matrix can be constructed. From this measurement,
we perform the time-reversal and eigen analysis. The highest eigenvalue
is the best possible transmission efficiency and its corresponding
eigenvector represents the transmitting excitation at the transmitting
elements to achieve maximum efficiency. The nature of this method makes
it possible to operate in unknown, random, and cluttered environments
because the maximization is based on the measured signals. Also, this
method allows for the adjustment of the system due to the change of the
channel, which makes this method adaptive and robust.
Experimental setup in the office/laboratory environment
Communication efficiency comparison in conducting sphere cases. Left:
schematic of the experimental setup, Right: the efficiency comparison.
Related publications
- S. Jaruwatanadilok, Y. Kuga, and A. Ishimaru,
"Optimum
Wireless Communication Through Unknown Obscuring Environments Using
the Time-Reversal Principle: Theory and Experiments," URSI -
APS, Albuquerque, NM, July 9-14, 2006.
- A. Ishimaru, S. Jaruwatanadilok, and Y. Kuga,
"Time-reversal
techniques applied to communications through unknown obscuring
medium," AMS SIAM, San Antonio, TX, January 10-15, 2006.
- A. Ishimaru, S. Jaruwatanadilok, and Y. Kuga,
"Time
reversal in random media and super resolution with shower curtain
effects and backscattering enhancement," URSI GA, New
Delhi, India, October 23-29, 2005.
- A. Ishimaru, S. Jaruwatanadilok, and Y. Kuga,
"Time
reversal in random media and super-resolution," URSI - APS,
Washington, DC, July 3-8, 2005.
Sponsored by NSF and ONR
|