Robust underwater acoustic channel estimation method based on joint norm optimization

An underwater acoustic channel and norm optimization technology, applied in the field of signal processing, can solve problems such as large amount of calculation, large amount of storage, insufficient precision, insufficient multi-path delay resolution ability, etc.

Active Publication Date: 2015-08-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art and solve the problems of insufficient accuracy of the existing underwater acoustic channel estimation method under the condition of low signal-to-noise ratio, insufficient resolution of multipath time delay, and large amount of computation and storage, the present invention uses a single hydroacoustic The received data and the detection signal o

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  • Robust underwater acoustic channel estimation method based on joint norm optimization
  • Robust underwater acoustic channel estimation method based on joint norm optimization
  • Robust underwater acoustic channel estimation method based on joint norm optimization

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] At the beginning of communication, the transmitting transducer emits a detection signal s 0 (t). The detection signal reaches the hydrophone after passing through the ocean medium, sea surface, sea bottom, etc., and is recorded by the hydrophone as x(t). x(t) is sampled by the data collector to obtain the discrete form x(n) of the received signal. Discretize the detection signal s with the same sampling frequency 0 (t) get sequence s 0 (n). The signal processing end utilizes the method of the present invention to process signals x(n) and s 0 (n), get the estimate of the unit impulse response of the underwater acoustic channel.

[0024] figure 1 Shown is a schematic diagram of the arrangement of the transmitting transducer and a single hydrophone in the ocean in the underwater acoustic communication system.

[0025] The specific implementa...

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Abstract

The invention provides a robust underwater acoustic channel estimation method based on joint norm optimization. A detection signal is sampled to obtain a discrete time sequence; a cost function of underwater acoustic channel response estimation is established on the basis of the thought of joint norm optimization; a support domain of a channel function is defined by using a matched filtering method; and a channel estimation result is modified, and loop iteration is continued to obtain estimation of underwater acoustic channel pulse response. The cost function based on joint norm of a channel response function is constructed through the sparsity of an underwater acoustic channel, so that the requirement of an algorithm on the signal to noise ratio is lowered effectively. Meanwhile, the resolution capability of multipath time delay is enhanced; the problems of heavy computation, large storage amount and high time consumption in channel estimation are solved; and the 'false peak' effect occurring in channel estimation is reduced.

Description

technical field [0001] The invention relates to the field of underwater communication, especially a signal processing method. Background technique [0002] When the signal sent by the transmitting transducer is transmitted through the ocean channel, the hydrophone received signal x(t) can be modeled as the linear convolution of the original transmitted signal s(t) and the channel function h(t) and superimposed on the ocean environment noise n ( t ) : x ( t ) = s ( t ) ⊗ h ( t ) + n ( t ) = ∫ s ( t - τ ) h ( τ ...

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Application Information

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IPC IPC(8): H04L25/02
Inventor 杨益新王永威徐灵基朱健楠
Owner NORTHWESTERN POLYTECHNICAL UNIV
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