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Full-duplex underwater acoustic communication unit able to suppress the local transmitting interference

A technology for transmitting interference and underwater acoustic communication, applied in electrical components, transmission systems, etc., can solve the problem that code division multiple access technology is difficult to adopt coding, and the difference between receiving and sending signals is difficult to make large, and frequency division multiple access technology lacks frequency resources and other issues to achieve the effect of eliminating local transmission interference, improving performance, and eliminating local transmission signal interference

Inactive Publication Date: 2007-10-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for underwater acoustic communication, due to the limitation of working bandwidth, on the one hand, frequency division multiple access technology lacks sufficient frequency resources; The mutual difference is difficult to make large, so the performance of full-duplex underwater acoustic communication is greatly limited

Method used

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  • Full-duplex underwater acoustic communication unit able to suppress the local transmitting interference
  • Full-duplex underwater acoustic communication unit able to suppress the local transmitting interference
  • Full-duplex underwater acoustic communication unit able to suppress the local transmitting interference

Examples

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Effect test

Embodiment 1

[0022] The invention includes: a transmitting transducer, a receiving hydrophone, a power amplifier, an analog-to-digital converter, a digital-to-analog converter, a frequency-spreading underwater acoustic communication module, and an adaptive filtering module. In this embodiment, the transmitting transducer adopts the 065 type 7kHz transmitting transducer produced by the state-owned 612 factory; the receiving hydrophone adopts the broadband receiving hydrophone produced by the state-owned 612 factory; the power amplifier adopts the PSM2000A power amplifier produced by the state-owned 6909 factory ; Analog-to-digital converter and digital-to-analog converter adopt 4472-type AD board and 6733-type DA board of National Instruments Company of the United States respectively; the spread-spectrum underwater acoustic communication module and adaptive filter module are implemented on the 8186 industrial control computer of National Instruments Company of the United States.

[0023] The...

Embodiment 2

[0047] In this embodiment, the spread-spectrum underwater acoustic communication module is implemented on the Blackfin533 DSP of Analog Devices, USA. The adaptive filtering module adopts the recursive least squares algorithm (RLS), and other parts are the same as in Embodiment 1.

[0048] The initialization of the RLS algorithm is

[0049] [W] 0 =0

[0050] [P] 0 =[I]

[0051] The iterative operation formula is

[0052] Y k =[W] k [X] k

[0053] ε k =D k -Y k

[0054] C k + 1 = [ P ] k [ X ] k λ + [ X ] k ...

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Abstract

The related full-duplex underwater acoustic communication apparatus comprises: connected in turns, a multiplex-frequency communication module, a DAC, a power amplifier, an emission energy converter, a receiver, an ADC, an adaptive filter module between the DAC and multiplex frequency module, wherein the input of filter receives coding modulated data from the communication module, the reference end receives data from ADC, and its output end sends data to the multiplex frequency module. Compared with prior art, this invention can eliminate greatly the local emission interference, and improves system performance.

Description

technical field [0001] The invention belongs to the field of full-duplex underwater acoustic communication, in particular, the invention relates to a full-duplex underwater acoustic communication machine capable of suppressing local transmission interference. Background technique [0002] Full-duplex underwater acoustic communication technology is one of the research difficulties in the field of underwater acoustic communication, and there are few researches at home and abroad. Due to simultaneous transmission and reception, the local transmission signal will become a strong interference source, which greatly affects the performance of full-duplex underwater acoustic communication. The current implementation methods mainly follow the techniques of Frequency Division Multiple Access (FDMA) and Code Division Multiple Access (CDMA) in radio communication. In frequency division multiple access, different operating frequencies are used for transmitting and receiving signals, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/38H04B1/525
Inventor 陈岩陈庚郭中源贾宁
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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