In-band full duplex underwater acoustic communication apparatus capable of suppressing interference from digital domain and analog domain

A technology for suppressing interference and communication machines, applied in duplex signal operations, transmission systems, electrical components, etc., can solve problems such as inability to improve spectrum efficiency, achieve in-band full-duplex underwater acoustic communication, eliminate self-interference, eliminate The effect of intersymbol interference

Inactive Publication Date: 2017-05-24
ZHEJIANG UNIV
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Problems solved by technology

But in fact, the frequency division multiple access method is not in-band full-duplex communication, but sacrifices spectral efficiency to obtain time efficiency. Due to the limitation of bandwidth, the code division multiple access method cannot improve spectral efficiency like in-band full-duplex

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  • In-band full duplex underwater acoustic communication apparatus capable of suppressing interference from digital domain and analog domain
  • In-band full duplex underwater acoustic communication apparatus capable of suppressing interference from digital domain and analog domain
  • In-band full duplex underwater acoustic communication apparatus capable of suppressing interference from digital domain and analog domain

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] In underwater acoustic communication, full-duplex communication can improve the transmission efficiency, but because the distant signal is very weak, it may be submerged in the local signal, so it is necessary to reduce the interference of the local signal. The channel for local transmission and reception is unknown, and it is necessary to reconstruct the local interference signal and combine it with the received signal to eliminate interference. After interference cancellation using the analog domain, the remaining self-interfering signals also need to be estimated at baseband and reconstructed digitally to cancel each other out.

[0027] This embodiment includes a transmitting unit and a receiving unit, the transmitting unit includes a sequentially connected modulator, a digital-to-analog converter, a power amplifier, and a transmittin...

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Abstract

The invention discloses an in-band full duplex underwater acoustic communication apparatus capable of suppressing interference from a digital domain and an analog domain. The full duplex underwater acoustic communication apparatus comprises a transmitting unit and a receiving unit, wherein the transmitting unit comprises a modulator, a digital-to-analog converter, a power amplifier and a transmitting transducer, and the receiving unit comprises a receiving hydrophone, a low-noise amplifier, an analog-to-digital converter and a demodulator. A receiving terminal is subjected to interference of near-end local transmitting signals while receiving remote signals and thus cannot acquire correct demodulated signals. According to the invention, a method for eliminating interference in the analog domain is selected to eliminate the interference, and part of self-interference can be eliminated. Furthermore, a method for eliminating interference in the digital domain is adopted, so that self-interference and inter-symbol interference are completely avoided. The underwater acoustic communication apparatus disclosed by the invention eliminates interference from the analog domain and the digital domain, thereby realizing in-band full duplex underwater acoustic communication in a real sense.

Description

technical field [0001] The invention belongs to the field of full-duplex underwater acoustic communication, and relates to an underwater acoustic communication machine which eliminates multipath interference and local transmission interference from the analog field and the digital field. Background technique [0002] Underwater acoustic communication is an important method to monitor the marine environment and explore marine resources. However, there are many challenges in underwater acoustic communication. Due to the slow transmission speed of sound, there is a large delay, and the narrow bandwidth of the underwater acoustic channel limits the underwater acoustic communication system. In the shallow sea area, full-duplex communicators have two types of interference, one is self-interference from local transmission, and the other is multi-path interference due to sea surface and bottom reflections. These interferences will greatly affect the performance of the full-duplex u...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H04B1/10H04B13/02H04L5/14
CPCH04B1/0475H04B1/10H04B13/02H04L5/14
Inventor 瞿逢重鲁泓颍秦祥照吴叶舟刘祖斌徐敬余官定宋宏邵士海潘文生
Owner ZHEJIANG UNIV
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