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November 27, 2011

Mtg: Application of Time-reversal Methods to Communication in Hostile Environments

by @ 1:57 pm. Filed under ALL, Communications, Electronics Design

WEDNESDAY November 30, 2011
OEB Signal Processing Chapter
Speaker: David Chambers, Lawrence Livermore National Laboratory
Time: Presentation from 12:30 PM â?? 2:00 PM
Cost: none
Place: Livermore Valley Open Campus â?? Lawrence Livermore Nat’l Laboratory, Greenville Rd, Livermore
RSVP: by email, to Ron Kane,

The application of time-reversal (TR) methods to the problem of communication in a highly reverberant environment is a new area motivated by advances in TR theory.? The fundamental concept involves time-reversing the impulse response or Greenâ??s function characterizing the uncertain communications channel to mitigate dispersion and multi-path effects.? This talk presents four basic approaches to implementing TR for both single antenna and array communication systems.? Experiments with an acoustic communication system placed in a highly reverberant room show TR methods can significantly reduce the effects of multipath and noise.? The performance is compared with the more conventional linear equalizer (inverse filter) which is the optimal solution when all the reverberations are included.? Not only do TR methods perform well in hostile environments but they can also be implemented with a â??1-bit??? analog-to-digital (A/D) converter design.? These perform quite well compared to the full 16 bit full dynamic range implementation.? In addition, experiments with an ultrasonic system show that TR methods can exploit multipath to create a secure communication channel with a receiver at a particular location.? Finally, an implementation of TR for ultra-wideband, carrier-less communications is described.

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