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A Blind Equalization Method for Underwater Acoustic Channel Based on Virtual Receiver

An underwater acoustic channel and receiver technology, applied in the field of communication, can solve problems such as unsatisfactory equalization effect, underutilization, slow convergence speed of blind equalization, etc., and achieve the effects of ensuring effective recovery, good equalization performance, and improving convergence speed

Inactive Publication Date: 2016-06-08
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The observation signal is directly used in the current blind equalization technical scheme, and it is only used once, so the channel information contained in the observation signal cannot be fully utilized. Defects such as unsatisfactory equalization effect under harsh communication channel conditions

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  • A Blind Equalization Method for Underwater Acoustic Channel Based on Virtual Receiver
  • A Blind Equalization Method for Underwater Acoustic Channel Based on Virtual Receiver
  • A Blind Equalization Method for Underwater Acoustic Channel Based on Virtual Receiver

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Embodiment example

[0043] Implementation case: the sea depth is 5km, the sound source is located 1km underwater, the receiver is located 0.9km underwater, the distance between the sound source and the receiver is 5km, the carrier frequency is 7kHz, the channel transmission rate is 40bit / s, and the channel baseband impulse response h=[ 0.3122,-0.104,0.8908,0.3134], the channel model is a mixed phase system. Set the channel impulse response between the virtual receiver and the receiver as h v1 =[0.1025,0.0607,0.9087,0.0679]. The transmitted signal is generated by an equiprobable binary sequence, and is modulated by QPSK. According to the CMA criterion, the cost function is set as:

[0044] J D = 1 4 [ | x ~ ( n ) ...

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Abstract

The invention discloses a virtual receiver-based underwater acoustic channel blind equalization method. The method includes the following steps: 1. Using the virtual receiver method to perform underwater acoustic channel blind equalization and a fusion blind equalization scheme under the virtual receiver method; 2. Using intelligent optimization algorithm to optimize the underwater deployment method of the virtual receiver. The present invention uses a virtual receiver to realize underwater acoustic channel blind equalization, which can effectively use the receiver observation signal information to improve the convergence speed and convergence accuracy of blind equalization; the present invention is based on virtual receiver underwater acoustic channel blind equalization, which can realize low Better equalization performance under the condition of signal-to-noise ratio, and the Gaussian noise is smoothed because the receiver uses a virtual receiver and performs fusion processing.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a virtual receiver-based underwater acoustic channel blind equalization method. Background technique [0002] Due to the complexity and particularity of underwater acoustic channels, so far, single-carrier time-domain equalization technology is still one of the key technologies to eliminate inter-symbol interference and improve the quality of underwater acoustic communication. Sound waves are the only medium capable of long-distance transmission in water. Sound waves are affected by multipath effects, energy attenuation, Doppler effects, and environmental noise during the propagation of underwater acoustic channels. Intersymbol interference will occur at the receiving end, seriously affecting communication. quality. Equalization technology uses an equalizer to compensate for the characteristics of the communication channel and achieve the purpose of eliminating intersymbol...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04B13/02
Inventor 肖瑛李敏董玉华李春杰宁海春
Owner DALIAN NATIONALITIES UNIVERSITY