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Underwater blind equalization system and method

A technology of blind equalization and subsystems, applied in baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as performance degradation of blind equalization systems

Inactive Publication Date: 2012-07-04
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the performance of the blind equalization system in the prior art is obviously degraded in the environment of low signal-to-noise ratio, and the present invention provides an underwater blind equalization system and method

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  • Underwater blind equalization system and method
  • Underwater blind equalization system and method

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and embodiment scheme, new method is described further:

[0045] figure 1 Among them, {s(n)} is the independent and identically distributed transmission signal sequence; c(n) is the impulse response vector of the unknown channel (in practice, it generally changes slowly); {w(n)} is the channel output Additive white Gaussian noise vector. Blind equalization is to adaptively adjust the equalizer tap weight coefficient vector f(n) through the blind equalization algorithm when only the received sequence y(n) is known, so that the output sequence z(n) of the equalizer after convergence is In a sense, the best estimate of a(n), at this time, the deviation between z(n) and a(n) is very small, and the output of z(n) after passing through the decision-making device The original transmitted signal a(n) is basically restored without distortion.

[0046] figure 2 For the traditional independent component analysis model (ICA model...

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Abstract

The invention provides an underwater blind equalization system, comprising a blind equalizer. The underwater blind equalization system is characterized by further comprising an underwater independent component analysis subsystem which is a preprocessing part of the blind equalization system, wherein the independent component analysis subsystem introduces different channel characteristic functions and Gaussian white noise as well as judgment logic and is used for carrying out judgment on a separation signal so as to separate the noise from a source signal; and an output signal of the independent component analysis subsystem is an input signal of the blind equalizer. A blind equalization method combined with independent component analysis comprises the following steps of: carrying out improvement on the traditional independent component analysis model so as to lead the traditional independent component analysis model to be applicable to an underwater sound communication system, using an underwater independent component analysis technology at the front end of the blind equalizer as the preprocessing part of the equalizer and forming a new blind equalization method. Compared with the traditional blind equalizer, the blind equalizer provided by the invention has the advantage that a signal constellation diagram output by the new method is clearest and most compact.

Description

technical field [0001] A blind equalization method (UN-ICA-CMA) combined with independent component analysis of the present invention is used in an underwater acoustic communication system, which can effectively overcome the intersymbol interference caused by multipath fading and other reasons, and better complete the The carrier recovery of a signal specifically relates to an underwater blind equalization system and method. Background technique [0002] In recent years, underwater acoustic communication has received extensive attention in the military and commercial fields, and improving the transmission efficiency and accuracy of underwater data has become a research hotspot and difficulty. In underwater acoustic channel communication with severely limited bandwidth, the signal is distorted due to multipath fading and dispersion. Channel equalization is an effective means to overcome inter-symbol interference. Blind equalization has become a research hotspot because it doe...

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Application Information

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IPC IPC(8): H04L25/03
Inventor 丁雪洁刘纪元田杰黄海宁隋天宇
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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