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Wideband multichannel time-reversal processing for acoustic communications in highly reverberant environments
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10.1121/1.2211588
/content/asa/journal/jasa/120/2/10.1121/1.2211588
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/2/10.1121/1.2211588
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) The basic communications problem: Host array transmission to client receiver stations through propagation channel (medium). The basic environment including the host transmitter/receiver, hostile medium along with the corresponding sets of Green’s functions transmitter-receiver pairs from host array to client receiver stations in the communications network array.

Image of FIG. 2.
FIG. 2.

(Color online) Time-reference receiver: reception (raw or processed data); inter-pulse delay , reversal, correlation, and polarity (sign) test for code extraction.

Image of FIG. 3.
FIG. 3.

(Color online) Time-reference receiver demodulation: (a) transmitted Gaussian pulse coded pairs. (b) Interpulse delayed, , sequence. (c) Correlation output with recovered sign bits (dashed impulses) from polarity testing.

Image of FIG. 4.
FIG. 4.

(Color online) T/R preprocessing for Gaussian-windowed chirp in a reverberative stairwell medium: (a) Transmitted pulse pair (code) sequence. (b) Raw received data. (c) T/R preprocessed data for input to TRef demodulator. (d) Zoomed Gaussian-window chirp pulse estimation (transmitted and recovered).

Image of FIG. 5.
FIG. 5.

(Color online) TRef receiver with complimentary T/R processing: raw multichannel array input data, T/R preprocessor, matched-filter synchronizer, TRef demodulator and quantizer to extract the code.

Image of FIG. 6.
FIG. 6.

(Color online) Multichannel TRef I receiver output coded estimates (solid line) using the T/R I preprocessor in stairwell: Coded estimates (solid line) along with true BPSK code sequence (solid line) for (a) and (c) designs at each client receiver for true symbols and estimated symbols (엯) yielding a zero-bit error performance for the selected threshold. Performance U curves for focusing at client one using (b) (73% zero-symbol error threshold interval) and (d) (43% threshold interval) designs. The degradation of the design is 30% threshold interval.

Image of FIG. 7.
FIG. 7.

(Color online) Multichannel TRef III receiver output coded estimates (solid line) using the T/R III preprocessor in stairwell: Coded estimates (solid line) along with true BPSK code sequence (solid line) for (a) and (c) designs at each client receiver for true symbols and estimated symbols (엯) yielding a zero-bit error performance for the selected threshold. Performance U curves for focusing at client one using (b) (80% zero-symbol error threshold interval) and (d) (20% threshold interval) designs. The degradation of the design is 60% threshold interval.

Image of FIG. 8.
FIG. 8.

(Color online) Experimental environment and setup for T/R communications testing: waveguide layout with blind hallways and high corrugated steel ceilings along with the equipment setup for array-to-point communications. Note that a schematic map demonstrates the waveguide communications path with the client receiver is approximately from host array.

Image of FIG. 9.
FIG. 9.

(Color online) Multichannel TRef I receiver output coded estimates (solid line) using the T/R I preprocessor in short waveguide : Coded estimates (solid line) along with true BPSK code sequence (solid line) for (a) and (c) designs at each client receiver for true symbols and estimated symbols (엯) yielding a zero-bit error performance for the selected threshold. Performance U curves for focusing at client one using (b) (73% zero-symbol error threshold interval) and (d) (33% threshold interval) designs. The degradation of the design is 40% threshold interval.

Image of FIG. 10.
FIG. 10.

(Color online) Multichannel TRef III receiver output coded estimates (solid line) using the T/R III preprocessor in short waveguide : Coded estimates (solid line) along with true BPSK code sequence (solid line) for (a) and (c) designs at each client receiver for true symbols and estimated symbols (엯) yielding a zero-bit error performance for the selected threshold. Performance U curves for focusing at client one using (b) (75% zero-symbol error threshold interval) and (d) (9% threshold interval) designs. The degradation of the design is 66% threshold interval.

Image of FIG. 11.
FIG. 11.

(Color online) Multichannel TRef III receiver output coded estimates (solid line) using the T/R III preprocessor in long waveguide : Coded estimates (solid line) along with true BPSK code sequence (solid line) for (a) and (c) designs at each client receiver for true symbols and estimated symbols (엯) yielding a zero-bit error performance for the selected threshold. Performance U curves for focusing at client one using (b) (68% zero-symbol error threshold interval) and (d) (25% threshold interval) designs. The degradation of the design is 43% threshold interval.

Image of FIG. 12.
FIG. 12.

(Color online) TRef I–IV wideband receiver overall performance in stairwell using T/R preprocessor based on the threshold range (% of total) for zero-symbol error threshold interval performance at both client stations for designs. The narrowband designs from previous work (Ref. 18) are included for comparison.

Image of FIG. 13.
FIG. 13.

(Color online) TRef I–IV wideband receiver overall performance in stairwell using T/R preprocessor based on the threshold range (% of total) for zero-symbol error threshold interval performance at both client stations for designs. The narrowband designs from previous work (Ref. 18) are included for comparison.

Image of FIG. 14.
FIG. 14.

(Color online) TRef III–IV receiver performance in short and long waveguides using T/R preprocessor based on the threshold range (% of total) for zero-symbol error threshold interval performance at both client stations for both 24- and designs.

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/content/asa/journal/jasa/120/2/10.1121/1.2211588
2006-08-01
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Wideband multichannel time-reversal processing for acoustic communications in highly reverberant environments
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/2/10.1121/1.2211588
10.1121/1.2211588
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