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Remote steady communication method for underwater unmanned platform

A communication method and unmanned platform technology, applied in baseband systems, shaping networks in transmitters/receivers, digital transmission systems, etc., can solve problems such as error propagation, error in equalization results, etc.

Active Publication Date: 2018-11-02
HARBIN ENG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the decision feedback equalizer structure itself has certain shortcomings, that is, it must be assumed that the decision information at the past time is correct, otherwise error propagation will occur, resulting in all subsequent equalization results being wrong

Method used

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  • Remote steady communication method for underwater unmanned platform
  • Remote steady communication method for underwater unmanned platform
  • Remote steady communication method for underwater unmanned platform

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Embodiment Construction

[0117] A single-vector-based TW-EFB-AMDFE equalization method provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0118] In one embodiment according to the present invention, figure 1 Schematic diagram of underwater acoustic communication system for unmanned platform.

[0119] figure 2 It is a schematic flow chart of TW-EFB-AMDFE equalization based on single vector. According to this embodiment, the process from design of transmitted signal to balanced output is as follows:

[0120] 1. Signal design

[0121] The transmission signal includes five parts: linear frequency modulation signal (LFM), guard interval, rectangular pulse (CW signal) signal, training sequence (training), and communication signal (data). The frame structure design of the signal is as follows: image 3 As shown, the signal structure of each frame is sequentially guard interval, LFM, guard interval, CW signal, guard interval, training, dat...

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Abstract

The invention relates to a remote steady communication method for an underwater unmanned platform. By use of the physical characteristic that an underwater acoustic channel is asymmetric about time and by use of a bidirectional adaptive multichannel decision feedback equalizer formed by combining a time reverser and an adaptive multichannel decision feedback equalizer, equalization of a single vector hydrophone-based bidirectional adaptive multichannel decision feedback equalizer is carried out. The remote steady communication method for the underwater unmanned platform introduces an error feedback filter circuit to form the bidirectional adaptive multichannel decision feedback equalizer, so as to carry out the equalization of the single vector hydrophone-based bidirectional adaptive multichannel decision feedback equalizer. According to the remote steady communication method for the underwater unmanned platform, the probability of a signal decision mistake is reduced, and the equalization error rate is further reduced; an error in the past time is fed back into the equalizer to reduce the relevancy between error signals in the equalizer, so that the error rate after the equalization is further reduced, and the steadiness of a receiver is effectively improved; and the equalization performance of the receiver is further improved.

Description

technical field [0001] The invention relates to an underwater communication method, in particular to a remote and robust communication method for an underwater unmanned platform. Background technique [0002] The ocean is a complex underwater acoustic channel that varies randomly in time and space. In underwater acoustic communication, in addition to serious multi-path interference, the propagation path loss, multipath fading and Doppler effect of the underwater acoustic signal during the propagation process will cause signal distortion, which will cause serious distortion of the signal received by the receiver. Intersymbol interference, thereby degrading the communication quality, and even making the communication process unable to be carried out effectively. Adaptive multi-channel decision feedback channel equalization technology is one of the means to effectively suppress inter-symbol interference in high-speed underwater acoustic communication. It is an effective combi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B13/02
CPCH04B13/02H04L25/03267
Inventor 生雪莉阮业武陆典殷敬伟韩笑杨超然
Owner HARBIN ENG UNIV
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