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Underwater acoustic communications u...

Edelmann, Geoffrey Fred.

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Underwater acoustic communications using time reversal.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Underwater acoustic communications using time reversal./
作者:	Edelmann, Geoffrey Fred.
面頁冊數:	129 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3322.
Contained By:	Dissertation Abstracts International64-07B.
標題:	Physics, Acoustics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3099539

Underwater acoustic communications using time reversal.
Edelmann, Geoffrey Fred.

Underwater acoustic communications using time reversal. - 129 p.

Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3322.

Thesis (Ph.D.)--University of California, San Diego, 2003.

This dissertation contains theoretical and experimental results on the application of the time-reversal process to communications in order to improve acoustic ocean transmissions. A coherent underwater acoustic communication system must deal with the inter-symbol interference caused by the time-varying, dispersive, shallow-water ocean environment. A new communication system concept is proposed in this thesis that takes advantage of the focal properties of time reversal. The spatial and temporal compression of the time-reversal focus mitigates channel fading, reduces the dispersion caused by the channel and increases the signal strength. Therefore, the receiver in a time-reversal communication system would not require spatial diversity, i.e., an array of receiving sensors.Subjects--Topical Terms:

1019086
Physics, Acoustics.

Underwater acoustic communications using time reversal.
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100 1 $a Edelmann, Geoffrey Fred. $3 1949507
245 1 0 $a Underwater acoustic communications using time reversal.
300 $a 129 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3322.
500 $a Chair: William S. Hodgkiss.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2003.
520 $a This dissertation contains theoretical and experimental results on the application of the time-reversal process to communications in order to improve acoustic ocean transmissions. A coherent underwater acoustic communication system must deal with the inter-symbol interference caused by the time-varying, dispersive, shallow-water ocean environment. A new communication system concept is proposed in this thesis that takes advantage of the focal properties of time reversal. The spatial and temporal compression of the time-reversal focus mitigates channel fading, reduces the dispersion caused by the channel and increases the signal strength. Therefore, the receiver in a time-reversal communication system would not require spatial diversity, i.e., an array of receiving sensors.
520 $a In shallow water, the time-reversal communications system was shown to communicate at bit rates of 500 bps and 1000 bps with a bit error rate of 0 out of 4976 bits and 254 out of 9953 bits, respectively, to a receiver at a distance of 10 km and at a carrier frequency of 3500 Hz. In a shallow-water upslope region, a bit error rate of 15 out of 4976 bits and 14 out of 4976 bits was achieved over the same distance without equalization. Time-reversal results are inter-compared with single source and broadside measurements and shown to have superior results in several test locations. The time-reversal performance appears limited by self-generated inter-symbol interference. Using adaptive channel equalization, these sidelobes are further suppressed potentially allowing communications at higher bit rates.
520 $a The time-reversal transmission appears to be stable for the order of tens of minutes at 3500 Hz as opposed to seconds to minutes for one-way transmission. The presence of internal waves were observed and realistic simulations are generated to explore their effect on the measured time-reversal signal. A time-reversal signal is more stable than a one-way transmission from a single element due to the spatial diversity of the transmitter array.
590 $a School code: 0033.
650 4 $a Physics, Acoustics. $3 1019086
650 4 $a Engineering, Marine and Ocean. $3 1019064
650 4 $a Physical Oceanography. $3 1019163
690 $a 0986
690 $a 0547
690 $a 0415
710 2 0 $a University of California, San Diego. $3 1018093
773 0 $t Dissertation Abstracts International $g 64-07B.
790 1 0 $a Hodgkiss, William S., $e advisor
790 $a 0033
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3099539