Underwater sound communication device and method based on time reversal and orthogonal frequency division multiplexing (OFDM) combined treatment

A technology for joint processing and underwater acoustic communication, applied in baseband system components, shaping networks in transmitters/receivers, electrical components, etc., and can solve problems such as reducing communication reliability.

Inactive Publication Date: 2012-07-04
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

The existing method is to increase the length of the OFDM symbol. Although this improves the communication efficiency, it also reduces the subcarrier frequency interval of the OFDM symbol. In the dynamic underwater acoustic channel, the inter-carrier interference (inter-carrier interference, referred to as "ICI"), reducing communication reliability

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  • Underwater sound communication device and method based on time reversal and orthogonal frequency division multiplexing (OFDM) combined treatment
  • Underwater sound communication device and method based on time reversal and orthogonal frequency division multiplexing (OFDM) combined treatment
  • Underwater sound communication device and method based on time reversal and orthogonal frequency division multiplexing (OFDM) combined treatment

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0052] like figure 1 As shown, the underwater acoustic communication device based on time-reverse and OFDM joint processing of the present invention includes a signal transmitter, a power amplifier, a transmitting transducer, a receiving hydrophone array, a signal receiver and a signal processor. in:

[0053] The signal transmitter is used to generate a communication signal, the communication signal includes a chirp signal and an OFDM signal, and a guard interval is inserted between the chirp signal and the OFDM signal, wherein the OFDM signal is obtained by inserting the external communication data into the pilot data Modulated by OFDM;

[0054] The power amplifier is used to amplify the power of the communication signal;

[0055] The transmitting transducer is used to convert the amplified communication signal into an acoustic signal, and tra...

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Abstract

The invention discloses an underwater sound communication device and a method based on time reversal and orthogonal frequency division multiplexing (OFDM) combined treatment. The underwater sound communication device comprises a signal transmitter, a power amplifier, a transmitting transducer, a receiving hydrophone array, a signal receiver and a signal processor, wherein the signal processor comprises a broadband Doppler estimation and compensation module, a time reversal processing module, an OFDM demodulation module, a channel estimation and compensation module and a frequency deviation estimation and compensation module. In the underwater sound communication device, the space time focusing characteristics of the time reversal are utilized to eliminate the multipath influence of the channel; a pulse channel response length can be shortened by the time reversal so as to reduce the length of an OFDM symbol guard interval and improve the communication efficiency; and because the guard interval is reduced, the length of the OFDM symbol can be shortened so as to enlarge a subcarrier frequency interval. With the method disclosed by the invention, interference among subcarriers can be reduced, and the available rate of the OFDM underwater sound communication is further improved.

Description

technical field [0001] The invention relates to a time-reverse and OFDM underwater acoustic communication device and method, belonging to the technical field of underwater acoustic communication. Background technique [0002] Since the mid-to-late 1990s, some people have gradually applied Orthogonal Frequency Division Multiplexing (OFDM) technology to underwater acoustic communications. It is simple to implement and receive hardware, and now OFDM communication has become a research hotspot in the field of underwater acoustic communication. In order to achieve reliable communication, the guard interval length of OFDM needs to be greater than the maximum channel delay extension length, and the delay extension of underwater acoustic channel is serious, thus reducing the efficiency of OFDM underwater acoustic communication. The existing method is to increase the length of the OFDM symbol. Although this improves the communication efficiency, it also reduces the subcarrier freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03H04B13/02
Inventor 潘翔徐来贵
Owner ZHEJIANG UNIV
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