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An OFDM Receiver with Frequency Domain Diversity Combined Impulsive Noise Canceller for Underwater Network.

Saotome R, Hai TM, Matsuda Y, Suzuki T, Wada T - ScientificWorldJournal (2015)

Bottom Line: The OFDM receiver utilizes 20-28 KHz ultrasonic channel and subcarrier spacing of 46.875 Hz (MODE3) and 93.750 Hz (MODE2) OFDM modulations.In addition, the paper shows Impulsive Noise distribution data measured at a fishing port in Okinawa and at a barge in Shizuoka prefectures and then proposed diversity OFDM transceivers architecture and experimental results are described.By the proposed Impulsive Noise Canceller, frame bit error rate has been decreased by 20-30%.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan.

ABSTRACT
In order to explore marine natural resources using remote robotic sensor or to enable rapid information exchange between ROV (remotely operated vehicles), AUV (autonomous underwater vehicle), divers, and ships, ultrasonic underwater communication systems are used. However, if the communication system is applied to rich living creature marine environment such as shallow sea, it suffers from generated Impulsive Noise so-called Shrimp Noise, which is randomly generated in time domain and seriously degrades communication performance in underwater acoustic network. With the purpose of supporting high performance underwater communication, a robust digital communication method for Impulsive Noise environments is necessary. In this paper, we propose OFDM ultrasonic communication system with diversity receiver. The main feature of the receiver is a newly proposed Frequency Domain Diversity Combined Impulsive Noise Canceller. The OFDM receiver utilizes 20-28 KHz ultrasonic channel and subcarrier spacing of 46.875 Hz (MODE3) and 93.750 Hz (MODE2) OFDM modulations. In addition, the paper shows Impulsive Noise distribution data measured at a fishing port in Okinawa and at a barge in Shizuoka prefectures and then proposed diversity OFDM transceivers architecture and experimental results are described. By the proposed Impulsive Noise Canceller, frame bit error rate has been decreased by 20-30%.

No MeSH data available.


(a) MODE3 QPSK constellations (branches 1 to 4 and MRC, Okinawa). (b) MODE2 QPSK constellations (branches 1 to 4 and MRC, Okinawa).
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fig8: (a) MODE3 QPSK constellations (branches 1 to 4 and MRC, Okinawa). (b) MODE2 QPSK constellations (branches 1 to 4 and MRC, Okinawa).

Mentions: Table 2 summarizes ocean experiment parameters for both Okinawa OJIMA fishing port site and Shizuoka UCHIURA barge site. In Okinawa site, horizontal underwater communication is carried out while vertical communication is experimented in Shizuoka site, for The four RX transducers are placed as linear array with 20 cm pitch. Figures 8(a) and 8(b) are MODE3 and MODE2 constellations in Okinawa site, respectively. Upper four constellations correspond to branches 1 to 4 2nd MRC inputs. The bottom constellation is 2nd MRC output. The horizontal axis of each figure shows real part of digital modulation, while the vertical axis corresponds to imaginary part. According to the figures, carrier diversity combining MRC successfully reduces variance of constellation points.


An OFDM Receiver with Frequency Domain Diversity Combined Impulsive Noise Canceller for Underwater Network.

Saotome R, Hai TM, Matsuda Y, Suzuki T, Wada T - ScientificWorldJournal (2015)

(a) MODE3 QPSK constellations (branches 1 to 4 and MRC, Okinawa). (b) MODE2 QPSK constellations (branches 1 to 4 and MRC, Okinawa).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4553320&req=5

fig8: (a) MODE3 QPSK constellations (branches 1 to 4 and MRC, Okinawa). (b) MODE2 QPSK constellations (branches 1 to 4 and MRC, Okinawa).
Mentions: Table 2 summarizes ocean experiment parameters for both Okinawa OJIMA fishing port site and Shizuoka UCHIURA barge site. In Okinawa site, horizontal underwater communication is carried out while vertical communication is experimented in Shizuoka site, for The four RX transducers are placed as linear array with 20 cm pitch. Figures 8(a) and 8(b) are MODE3 and MODE2 constellations in Okinawa site, respectively. Upper four constellations correspond to branches 1 to 4 2nd MRC inputs. The bottom constellation is 2nd MRC output. The horizontal axis of each figure shows real part of digital modulation, while the vertical axis corresponds to imaginary part. According to the figures, carrier diversity combining MRC successfully reduces variance of constellation points.

Bottom Line: The OFDM receiver utilizes 20-28 KHz ultrasonic channel and subcarrier spacing of 46.875 Hz (MODE3) and 93.750 Hz (MODE2) OFDM modulations.In addition, the paper shows Impulsive Noise distribution data measured at a fishing port in Okinawa and at a barge in Shizuoka prefectures and then proposed diversity OFDM transceivers architecture and experimental results are described.By the proposed Impulsive Noise Canceller, frame bit error rate has been decreased by 20-30%.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan.

ABSTRACT
In order to explore marine natural resources using remote robotic sensor or to enable rapid information exchange between ROV (remotely operated vehicles), AUV (autonomous underwater vehicle), divers, and ships, ultrasonic underwater communication systems are used. However, if the communication system is applied to rich living creature marine environment such as shallow sea, it suffers from generated Impulsive Noise so-called Shrimp Noise, which is randomly generated in time domain and seriously degrades communication performance in underwater acoustic network. With the purpose of supporting high performance underwater communication, a robust digital communication method for Impulsive Noise environments is necessary. In this paper, we propose OFDM ultrasonic communication system with diversity receiver. The main feature of the receiver is a newly proposed Frequency Domain Diversity Combined Impulsive Noise Canceller. The OFDM receiver utilizes 20-28 KHz ultrasonic channel and subcarrier spacing of 46.875 Hz (MODE3) and 93.750 Hz (MODE2) OFDM modulations. In addition, the paper shows Impulsive Noise distribution data measured at a fishing port in Okinawa and at a barge in Shizuoka prefectures and then proposed diversity OFDM transceivers architecture and experimental results are described. By the proposed Impulsive Noise Canceller, frame bit error rate has been decreased by 20-30%.

No MeSH data available.