| Presentation | 2007-08-24 QPSK and 8PSK Acoustic Communication Experiment in Deep Sea Hiroshi OCHI, Yoshitaka WATANABE, Takuya SHIMURA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In JAMSTEC, short-range (up to 500 m) high speed (over 64 kbps) acoustic communication system for deep sea environment has been investigating. To obtaining an real sea data of acoustic transmission, an experiment was carried out at the depth of 1, 000m. A transmitter was moored at near sea bottom. And a receiver was suspended from a surface ship by wire rope. The distance between the transmitter and the receiver was 250-550m. As a transducer, wideband tilted toroidal beam with reflector was used. By this transducer, when the transmitter was moored at near the sea bottom, bottom reflected waves were well reduced. Carrier frequency of this projector is 80 kHz, and its bandwidth is 40 kHz. Two omni-directional hydrophones were used for receiving. Quadrature phase shift keying (QPSK) and 8PSK were used as its modulation method. The data of several transmission speed (10 k symbol per second (sps), 12.5ksps, 16ksps, 20ksps, 25ksps and 40ksps) were obtained at the transmission range of 250-550m. The two channel decision feedback equalizer (DFE) was applied for the demodulation algorithm. In this experiment, 80 kbps of transmission rate, was achieved at range of 510m with using QPSK, and 120kbps of transmission rate was achieved at range of 300m with using. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Acoustic Communication / QPSK / 8PSK / Wideband Transducer / Deep water |
| Paper # | US2007-28 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2007/8/17(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | QPSK and 8PSK Acoustic Communication Experiment in Deep Sea |
| Sub Title (in English) | |
| Keyword(1) | Acoustic Communication |
| Keyword(2) | QPSK |
| Keyword(3) | 8PSK |
| Keyword(4) | Wideband Transducer |
| Keyword(5) | Deep water |
| 1st Author's Name | Hiroshi OCHI |
| 1st Author's Affiliation | Advanced Marine Technology Research Program, Marine Technology Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)() |
| 2nd Author's Name | Yoshitaka WATANABE |
| 2nd Author's Affiliation | Advanced Marine Technology Research Program, Marine Technology Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) |
| 3rd Author's Name | Takuya SHIMURA |
| 3rd Author's Affiliation | Advanced Marine Technology Research Program, Marine Technology Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) |
| Date | 2007-08-24 |
| Paper # | US2007-28 |
| Volume (vol) | vol.107 |
| Number (no) | 200 |
| Page | pp.pp.- |
| #Pages | 5 |
| Date of Issue | |