Title:
位置変動に対して性能低下防止機能を有するＯＦＤＭ変調を用いた水中超音波通信装置
Document Type and Number:
Japanese Patent JP6707737
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an underwater ultrasonic communication device using OFDM modulation resistant to position fluctuation, by preventing deterioration of transmission performance incident to position fluctuation of a transmitter or a receiver.SOLUTION: An underwater ultrasonic communication device includes an analog/digital conversion unit for converting a received signal into a digital value at a sampling frequency, an extension and contraction ratio detector 32 for detecting the ratio of temporal extension and contraction of the received signal incident to position fluctuation between down conversion processing 31 and a transducer, a re-sampling unit performing re-sampling conversion of the received signal converted into a digital value according to the extension and contraction ratio, a derotation unit 33 for correcting a deviation of frequency generated by re-sampling conversion, and a Doppler shift detector 34 for detecting a Doppler shift amount by temporal change of some sub-carriers composing an OFDM signal (orthogonal frequency division multiplex). Accuracy of received signal is improved for position fluctuation between transceivers by performing Doppler correction of the OFDM signal based on the Doppler shift amount.SELECTED DRAWING: Figure 3
Inventors:
Tomohisa Wada
Suzuki Daisaku
Shigeo Nakagawa
Suzuki Daisaku
Shigeo Nakagawa
Application Number:
JP2016085918A
Publication Date:
June 10, 2020
Filing Date:
April 22, 2016
Export Citation:
Assignee:
National University Corporation Ryukyu University
National Institute of Technology
Oxytech Co., Ltd.
National Institute of Technology
Oxytech Co., Ltd.
International Classes:
H04L27/26; H04B11/00; H04L27/01
Foreign References:
| US20090129204 | ||||
| WO2012121151A1 |
Other References:
T.MinhHai(他3名),A transceiver architecture for ultrasonic OFDM with adaptive Doppler compensation,OCEANS 2015 - MTS/IEEE Washington,米国,IEEE,2015年10月22日
R.Saotome(他4名),An OFDM Receiver with Frequency Domain Diversity Combined Impulsive Noise Canceller for Underwater Network,The Scientific World Journal,英国,Hindawi Publishing Corporation,2015年,Volume 2015, Article ID 841750,pp.1-10
T.Guo(他2名),Doppler estimation and compensation for underwater acoustic OFDM systems,Proceedings of 2011 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference,米国,IEEE,2011年 6月30日,pp.863-867
R.Saotome(他4名),An OFDM Receiver with Frequency Domain Diversity Combined Impulsive Noise Canceller for Underwater Network,The Scientific World Journal,英国,Hindawi Publishing Corporation,2015年,Volume 2015, Article ID 841750,pp.1-10
T.Guo(他2名),Doppler estimation and compensation for underwater acoustic OFDM systems,Proceedings of 2011 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference,米国,IEEE,2011年 6月30日,pp.863-867
Attorney, Agent or Firm:
Hideto Okubo