Processing method for channel self-adaptation single carrier underwater acoustic coherent communication signals

A processing method and technology for communication signals, which are applied to shaping networks, baseband system components, multi-frequency code systems, etc.

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

Therefore, in underwater acoustic communication, whether the existing single-carrier system uses time-domain equalization or frequency-domain equalization alone, or uses time-reversed time-frequency domain equalization alone, the performance is poor, that is, Limit the scope of use of these communication signal processing methods

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  • Processing method for channel self-adaptation single carrier underwater acoustic coherent communication signals
  • Processing method for channel self-adaptation single carrier underwater acoustic coherent communication signals
  • Processing method for channel self-adaptation single carrier underwater acoustic coherent communication signals

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] A channel adaptive single-carrier underwater acoustic coherent communication signal decoding method provided by the present invention involves two parts: transmitting and receiving. The underwater acoustic communication process of the present invention, such as figure 1 shown. The entire communication process includes sequentially connected single-carrier coherent modulation modules, digital-to-analog converters, power amplifiers, transmitting transducers and sequentially connected receiving hydrophones, analog-to-digital converters, and single-carrier coherent demodulation modules. The single-carrier coherent modulation and demodulation module is implemented on an industrial computer or DSP. The single-carrier coherent modulation module encodes and modulates the information to be transmitted. The information can be in any form such a...

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Abstract

The invention relates to a processing method for channel self-adaptation single carrier underwater acoustic coherent communication signals. The method is conducted based on a plurality of signal frames and a block synchronization head. The block synchronization head and the plurality of signal frames form a data block. Each signal frame comprises a frame head and a plurality of subframe data, and each subframe data sequentially includes a unique word (UW), data, a UW and a zero pad (ZP). A block and a frame synchronization head respectively use a method for an m sequence code to conduct two-dimensional searching in a time domain and a frequency domain to obtain block time synchronization, frame time synchronization and Doppler frequency offset and estimate a channel of a current frame. Doppler compensation is conducted on the signal frame according to the Doppler frequency offset to obtain frame data. Time reversal is conducted. Time forward frame data and time reversal frame data serve as input signals, time forward and reversal time frequency domain balancing joint processing arithmetic under the control of a judging selecting standard is used for selecting a decoding method and decoding the data in the signals.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, in particular to a channel adaptive single-carrier underwater acoustic coherent communication signal processing method. Background technique [0002] Underwater acoustic communication technology has broad application prospects in both national defense and civil affairs. The complex and time-varying channel structure in underwater acoustic channels will cause serious intersymbol interference at the receiving end. Generally speaking, there are three methods to combat intersymbol interference: Single carrier time domain equalization, single carrier frequency domain equalization and multi carrier frequency domain equalization. [0003] In the underwater acoustic channel, compared with the multi-carrier system, the single-carrier system has the advantages of high peak-to-average ratio and easy tracking of the carrier phase. For a single-carrier system, time domain equalization or freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 贾宁郭中源黄建纯陈岩马力陈庚
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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