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Multichannel time-reversal processing for acoustic communications in a highly reverberant environment
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10.1121/1.2011167
/content/asa/journal/jasa/118/4/10.1121/1.2011167
http://aip.metastore.ingenta.com/content/asa/journal/jasa/118/4/10.1121/1.2011167
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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) T/R Receiver I transmission-based realization.

Image of FIG. 3.
FIG. 3.

(Color online) T/R Receiver II transmission-based realization.

Image of FIG. 4.
FIG. 4.

(Color online) T/R Receiver III reception-based realization.

Image of FIG. 5.
FIG. 5.

(Color online) T/R Receiver IV reception-based realization.

Image of FIG. 6.
FIG. 6.

(Color online) T/R receiver realizations: (a) T/R I and II designs on transmission. (b) T/R III and IV designs on reception.

Image of FIG. 7.
FIG. 7.

(Color online) Signal processing of experimental data: T/R reception (estimate code), demodulation (process), synchronization (locate code), quantization (extract code).

Image of FIG. 8.
FIG. 8.

(Color online) Experimental environment and setup for T/R communications testing: stairway layout with three landings and high corrugated steel ceilings along with the equipment setup for array-to-point communications. Note that client receiver No. 1 has a direct path from host array, while client receiver No. 2 does not.

Image of FIG. 9.
FIG. 9.

Transmitted and received code sequence in a stairwell: (a) transmitted BPSK coded sequence with carrier. (b) Received BPSK coded sequence with carrier including all stairwell effects. (c) Transmitted and received spectra.

Image of FIG. 10.
FIG. 10.

(Color online) Multichannel T/R I (normalized) receiver output coded estimates (solid line) along with true BPSK code sequence for (upper row) and (lower row) designs at each client receiver for true symbols (엯) and estimated symbols yielding a zero-bit error performance for the selected threshold.

Image of FIG. 11.
FIG. 11.

(Color online) T/R I receiver design performance U curves for focusing at clients 1 and 2 using 24- and designs. The degradation of the design is from 49% to 36% threshold interval for the first client receiver and from 45% to 16% for the second client receiver.

Image of FIG. 12.
FIG. 12.

(Color online) Multichannel T/R II (normalized) receiver output coded estimates (solid line) along with true BPSK code sequence for (upper row) and (lower row) designs at each client receiver for true symbols (엯) and estimated symbols yielding a zero-bit error performance for the selected threshold.

Image of FIG. 13.
FIG. 13.

(Color online) T/R II receiver design performance U curves for focusing at client receivers 1 and 2 using 24- and designs. The degradation of the design is from 36% to 33% threshold interval for the first client receiver and from 45% to 20% for the second client receiver.

Image of FIG. 14.
FIG. 14.

(Color online) Multichannel T/R III (normalized) receiver output coded estimates (solid line) along with true BPSK code sequence for (upper row) and (lower row) designs at each client receiver for true symbols (엯) and estimated symbols yielding a zero-bit error performance for the selected threshold.

Image of FIG. 15.
FIG. 15.

(Color online) T/R III receiver design performance U curves at client receivers 1 and 2 using 24- and designs. The degradation of the design is from 58% to 40% threshold interval for the first client receiver and from 70% to 43% for the second client receiver.

Image of FIG. 16.
FIG. 16.

(Color online) T/R receiver performance based on the threshold range (% of total) for zero-symbol error performance at both client stations for designs.

Image of FIG. 17.
FIG. 17.

(Color online) T/R receiver performance based on the threshold range (% of total) for zero-symbol error performance at both client stations for designs.

Image of FIG. 18.
FIG. 18.

(Color online) 1000 symbol code test on 24- and realizations of T/R receivers for focusing at client station No. 1. (a) realizations (% zero-bit error). (b) realizations (bit error rate).

Image of FIG. 19.
FIG. 19.

(Color online) 1000 symbol code test on 24- and realizations of T/R receivers for focusing at client station No. 2. (a) realizations (% zero-bit error). (b) realizations (bit error rate).

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/content/asa/journal/jasa/118/4/10.1121/1.2011167
2005-10-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multichannel time-reversal processing for acoustic communications in a highly reverberant environment
http://aip.metastore.ingenta.com/content/asa/journal/jasa/118/4/10.1121/1.2011167
10.1121/1.2011167
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