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Differential decoding method for resisting Doppler based on Pattern time delay encoded underwater acoustic communication

A technology of delay difference encoding and differential decoding, which is applied to electrical components, transmission systems, etc.

Inactive Publication Date: 2009-08-05
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of method that can solve the problem of time compression or expansion caused by Doppler due to motion, and is simple and easy to implement and has excellent performance. A differential decoding method based on Pattern time delay difference encoding underwater acoustic communication that resists Doppler

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  • Differential decoding method for resisting Doppler based on Pattern time delay encoded underwater acoustic communication
  • Differential decoding method for resisting Doppler based on Pattern time delay encoded underwater acoustic communication
  • Differential decoding method for resisting Doppler based on Pattern time delay encoded underwater acoustic communication

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Embodiment Construction

[0024] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0025] Pattern delay difference coding communication

[0026] Pattern delay difference coding underwater acoustic communication system integrates information coding technology and channel coding technology into the design of signal symbols, so that each basic symbol carrying information has the ability to resist underwater acoustic multi-path interference and can be transmitted reliably information, and the symbol duty cycle (Duty Cycle) is small, which has the characteristics of saving system power consumption. These characteristics make the PTDS system have application advantages in the field of underwater acoustic communication.

[0027] The information of the Pattern Time Delay Shift Coding (PTDS) communication system is not modulated in the symbol waveform, but modulated in the delay difference information that the Pattern code appears in the symbol window. ...

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Abstract

The invention provides a differential decoding method that resists Doppler Effect in underwater sound communication based on Pattern time delay skew encoding. The invention relates to the field of underwater sound communication techniques, in particular to a method that utilizes differential decoding for resistance to the Doppler Effect in underwater sound communication that is caused by movement of communication nodes, especially the Doppler Effect and time compression expansion effect that are caused by large movement speed of communication nodes in a Pattern time delay skew encoding system. Through the research on the differential decoding that is based on the Pattern time delay skew encoding, a simulative experiment of the differential decoding method proves that differential time delay estimation can effectively resist the influence of Doppler frequency excursion, and consequently proves the feasibility and the robustness of the differential decoding proposal. The differential decoding method aims at refining the communication system of Pattern time delay skew (PTDS) encoding, establishes good foundation for the research on mobile underwater sound communication techniques, and needs further and deeper research and improvement when being applied to practical engineering.

Description

(1) Technical field [0001] The invention relates to the technical field of underwater acoustic communication. Specifically, it is a method of using differential decoding to resist the Doppler effect caused by the movement of communication nodes in underwater acoustic communication, especially the Doppler effect caused by the large movement speed of communication nodes in the Pattern delay difference coding system. Puller effect and time compression expansion effect. (2) Background technology [0002] Underwater acoustic communication has always been an important field in underwater acoustic research, and its engineering application is not limited to the military, but also extends to the commercial field. Wireless underwater acoustic communication has the characteristics of flexibility, convenience, economy, and no cable entanglement. It can realize navigation, positioning, information exchange, communication and information transmission required for safety assurance. It is ...

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Application Information

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IPC IPC(8): H04B13/02
Inventor 赵安邦惠娟解立坤沈广楠周彬
Owner HARBIN ENG UNIV
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