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Orthogonal frequency division multiplexing (OFDM) underwater acoustic communication parallel iterative inter-carrier interference (ICI) elimination method

An underwater acoustic communication and iterative technology, applied in the transmitter/receiver shaping network, baseband system components, multi-frequency code system, etc., can solve problems that have not been studied

Inactive Publication Date: 2015-05-27
三亚哈尔滨工程大学南海创新发展基地
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Problems solved by technology

[0006] There is no related research in the field of underwater acoustics

Method used

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  • Orthogonal frequency division multiplexing (OFDM) underwater acoustic communication parallel iterative inter-carrier interference (ICI) elimination method
  • Orthogonal frequency division multiplexing (OFDM) underwater acoustic communication parallel iterative inter-carrier interference (ICI) elimination method
  • Orthogonal frequency division multiplexing (OFDM) underwater acoustic communication parallel iterative inter-carrier interference (ICI) elimination method

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Embodiment Construction

[0079] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0080] combine Figure 1~5 , based on the assumption that the channel changes approximately linearly within one OFDM symbol period, without changing the structure of the OFDM system, the channel impulse response at the middle moment of each OFDM symbol period is estimated with the help of comb pilots, and at the same time from the adjacent The time-varying slope of the channel impulse response is extracted from the channel information on the OFDM symbols. Then, the segmented linear interpolation is performed with the help of the obtained two sets of vectors to further estimate the channel impulse response at other times, and finally obtain the channel time-varying information within the entire OFDM symbol time. Next, using the derived ICI expression, combined with the estimated value of the transmitted symbol obtained from the previous equalization, the estimated...

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Abstract

The invention aims at providing an orthogonal frequency division multiplexing (OFDM) underwater acoustic communication parallel iterative inter-carrier interference (ICI) elimination method. The method includes the steps of building an OFDM underwater acoustic communication system, building an acoustic time varying multipath channel model, measuring Doppler factors in the system, estimating frequency response of a time varying channel, estimating an ICI component and a signal interference noise ratio (SINR), and carrying out parallel iterative minimum mean square error (MMSE) equilibrium to received signals. Through combination of a linear approximation method and the MMSE method, and through iteration to improve performance, the parallel iterative ICI elimination method is inducted into the OFDM underwater acoustic communication system, and the method can effectively resist the ICI generated under the underwater acoustic time varying channel, and the OFDM underwater acoustic communication system is steady in response to the change of channel time varying speed. Therefore, inverse operation of a high order matrix is avoided, complexity of the method is reduced, and arithmetic speed is improved.

Description

technical field [0001] The invention relates to a method for suppressing inter-carrier interference in underwater acoustic mobile communication. Background technique [0002] In the complex and changeable underwater acoustic channel, especially under the condition of mobile communication, the Doppler effect together with time-frequency selective fading caused by multipath delay, timing, carrier and sampling frequency offset and other factors will break the OFDM system. Interference-free parallel transmission between sub-carriers of each channel generates ICI, which affects the quality of data transmission. Among them, the ICI caused by Doppler expansion is too complex and difficult to eliminate. Therefore, in underwater acoustic mobile communication, subcarrier interference suppression technology has become a key technology that determines system performance, and has increasingly attracted extensive attention from researchers at home and abroad in the field of underwater ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03H04L25/02
Inventor 郑彩云廖佳玲乔钢马雪飞孙宗鑫周锋刘淞佐张可章佳荣
Owner 三亚哈尔滨工程大学南海创新发展基地
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