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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.


Received signal with many Impulsive Noise Peaks.
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Related In: Results  -  Collection


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fig3: Received signal with many Impulsive Noise Peaks.

Mentions: Figure 3 shows a measured received signal of one RX transducer at UCHIURA barge experiment with RX depth of 3 m. The center portion of the signal is OFDM frame and another portion corresponds to No signal. Many large Impulsive Noises are observed. Obviously, a large impulse gives serious damage to the OFDM signal demodulation. Then the background noise amplitude distributions are analyzed. This analysis only observes the background noise and no OFDM frame signal is included. Figures 4(a) and 4(b) are background noise distribution at Shizuoka with depth = 3 m and 9 m, respectively. Figures 5(a) and 5(b) are accumulated background noise from + infinity at Shizuoka site with depth = 3 m, 9 m. From the figures, more than 99% of the signals correspond to (a) area, which has relatively small signal amplitude, that is, low noise power. However, as shown in figures, relatively large signal amplitude (large noise power) is observed in the areas (b) and (c). Comparing Figures 4(a)with 4(b), shallow depth of 3 m shows larger signal amplitude. Therefore, the source of the Impulsive Noise can be expected at the bottom of the barge.


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)

Received signal with many Impulsive Noise Peaks.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig3: Received signal with many Impulsive Noise Peaks.
Mentions: Figure 3 shows a measured received signal of one RX transducer at UCHIURA barge experiment with RX depth of 3 m. The center portion of the signal is OFDM frame and another portion corresponds to No signal. Many large Impulsive Noises are observed. Obviously, a large impulse gives serious damage to the OFDM signal demodulation. Then the background noise amplitude distributions are analyzed. This analysis only observes the background noise and no OFDM frame signal is included. Figures 4(a) and 4(b) are background noise distribution at Shizuoka with depth = 3 m and 9 m, respectively. Figures 5(a) and 5(b) are accumulated background noise from + infinity at Shizuoka site with depth = 3 m, 9 m. From the figures, more than 99% of the signals correspond to (a) area, which has relatively small signal amplitude, that is, low noise power. However, as shown in figures, relatively large signal amplitude (large noise power) is observed in the areas (b) and (c). Comparing Figures 4(a)with 4(b), shallow depth of 3 m shows larger signal amplitude. Therefore, the source of the Impulsive Noise can be expected at the bottom of the barge.

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.