Underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation and device thereof

A multi-carrier modulation and linear frequency modulation technology, which is applied in ultrasonic/sonic/infrasonic transmission systems, multi-frequency code systems, electrical components, etc., can solve problems affecting communication quality, etc.

Inactive Publication Date: 2014-07-23
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0010] Aiming at the deficiencies in the prior art, the present invention adopts a chirp signal as an auxiliary pilot method, and proposes an underwater acoustic anti-Doppler multi-carrier modulation and demodulation method and device based on a chirp pilot, which can both improve The accuracy and efficiency of Doppler factor estimation will not reduce the transmission rate of the signal, overcome the shortcomings of the existing modulation methods, and solve the problem that the Doppler frequency shift seriously affects the communication quality in underwater acoustic communication. question

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  • Underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation and device thereof
  • Underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation and device thereof
  • Underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation and device thereof

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specific Embodiment approach

[0078] Such as figure 1 As shown, the information bit stream generated by the information source undergoes constellation mapping to obtain the corresponding phase data stream, and then performs serial-to-parallel conversion and carrier modulation to modulate the N constellation mapping data streams into corresponding N orthogonal chirp signals ( LFM) sub-carriers, and then transmit them together with the pilot signal through the sending end, and the pilot signal also uses a linear frequency modulation (LFM) signal. Due to the Doppler effect in the channel, Wigner-Hough transform is performed on the received signal at the receiving end to estimate the Doppler factor and perform Doppler frequency shift compensation, and then demodulate and restore the binary bit data stream through constellation inverse mapping . The specific implementation is as follows:

[0079] The launch principle of this device is as follows: Figure 4 As shown, R d for the information to be sent. Wil...

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Abstract

The invention discloses an underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation. The method comprises the following steps: step one, transmitting terminal multicarrier modulation is performed; step two, Doppler frequency shift factor estimation is performed; and step three, receiving terminal demodulation is performed. The invention also discloses a modulation and demodulation device of the underwater acoustic anti-Doppler multicarrier modulation and demodulation method based on linear frequency modulation. The device comprises a transmitting device and a receiving device which are interconnected. The method has advantages of being high in anti-Doppler capability, wide in applicability, diverse in realization method, low in cost, easy to realize, high in efficiency, etc.

Description

technical field [0001] The invention relates to an underwater acoustic communication technology, in particular to an underwater acoustic anti-Doppler multi-carrier modulation and demodulation method and device based on chirp pilots. Background technique [0002] With the rapid growth of human demand for resources, understanding, development and utilization of marine resources has become an important way to maintain the further development of human beings. The ocean is rich in resources and is the sapphire of the earth, and ocean development is closely related to underwater acoustic communication technology. The maturation of land communication technology provides technical guarantee and support for marine communication technology. With the intensification of marine research and exploration in various countries, underwater acoustic communication technology has made great progress and has become a hot research topic for scientists at home and abroad. [0003] However, marine...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B11/00H04B13/02
Inventor 宁更新宁小娟吴丽菲
Owner SOUTH CHINA UNIV OF TECH
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