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Method for eliminating underwater acoustic channel interference in underwater acoustic communication

A technology of underwater acoustic channel and interference elimination, which is applied to the shaping network in the transmitter/receiver, baseband system components, etc., and can solve problems that are not suitable for practical applications

Active Publication Date: 2018-11-27
浙江望海潮科技有限公司
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AI Technical Summary

Problems solved by technology

[0009] Existing single types of turbo equalizers, such as DA-TEQ, time domain CE-TEQ, frequency domain CE-TEQ, etc., cannot achieve a good compromise between algorithm performance and algorithm complexity
Existing hybrid turbo equalizers need external information transfer graphs, known channel information and a large number of Monte Carlo experiments. Therefore, this type of turbo equalizer is only suitable for computer simulation and theoretical analysis, not suitable for practical application

Method used

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  • Method for eliminating underwater acoustic channel interference in underwater acoustic communication
  • Method for eliminating underwater acoustic channel interference in underwater acoustic communication
  • Method for eliminating underwater acoustic channel interference in underwater acoustic communication

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Embodiment Construction

[0164] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0165] The impulse response of an underwater acoustic channel can be modeled as a time-varying finite-length impulse response filter. Considering a Single-Input Multiple-Output (SIMO) system with M hydrophones, the baseband signal received by the m-th hydrophone at time k can be expressed as

[0166]

[0167] where x k-l is the transmitted signal at time k-l, h m,l,k is the lth coefficient of the channel impulse response between the transmitting transducer and the mth hydrophone, L is the total length of the channel impulse response, v m,k is the Gaussian white noise superimposed on the mth hydrophone.

[0168] If given a length K 1 +K 2 +1 observation window, K 1is the length of the non-causal partial symbol, K 2 is the length of the causal part symbol; the signal received on the mth hydrophone can be written as a column vector,

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Abstract

The invention discloses a method for eliminating an underwater acoustic channel interference in underwater acoustic communication. The method comprises: step one, establishing an impulse response timedomain model and an impulse response frequency domain model of an underwater acoustic channel; step two, carrying out training by using a training sequence according to the impulse response time domain model of the underwater acoustic channel to obtain a channel impulse response matrix; step three, eliminating a channel interference of an information sequence by the training sequence by using thechannel impulse response matrix, thereby obtaining an information sequence after the interface elimination; step four, carrying out balancing between channels on the information sequence after the interface elimination to obtain estimation of the information sequence after channel balancing; and step five, carrying out soft-decision decoding on the estimation of the information sequence to obtaina final hard decision bit. According to the method disclosed by the invention, an accurate feedback symbol can be obtained; the inter-symbol interference is eliminated well; and the error propagationeffect is improved.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater acoustic channel interference elimination method in underwater acoustic communication. Background technique [0002] In recent years, with the continuous development of my country's marine information network and the continuous improvement of national defense construction, higher requirements have been put forward for underwater intelligence investigation, environmental monitoring, resource exploration, and disaster warning. Therefore, it is of great significance to build a highly intelligent, conveniently deployed, robust and reliable underwater sensor network for promoting my country's goal of building a maritime power. The underwater sensor network is composed of fixed nodes and mobile nodes. The fixed nodes include surface buoys and underwater submersible buoys. The mobile nodes use autonomous underwater light vehicles. Each node is closely conne...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 鄢社锋徐立军张震
Owner 浙江望海潮科技有限公司
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