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Low-power-consumption matched filtering method used for distinguishing existing of signal

A technology for matched filtering and signal discrimination, applied in impedance networks, digital technology networks, electrical components, etc., to solve problems such as increased power consumption

Inactive Publication Date: 2015-07-08
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even in a shift register corresponding to a plurality of bits, when data is shifted, there is a problem that power consumption increases greatly

Method used

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  • Low-power-consumption matched filtering method used for distinguishing existing of signal
  • Low-power-consumption matched filtering method used for distinguishing existing of signal
  • Low-power-consumption matched filtering method used for distinguishing existing of signal

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Experimental program
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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052]Underwater acoustic transponders are widely used in underwater acoustic positioning systems to determine the position of seabed sensors or devices, or to locate and navigate underwater vehicles, or to recover equipment. The underwater sound emitter mostly adopts 8-16kHz frequency and FSK coding, and the receiver needs to judge the frequency of the carrier signal in the envelope to provide support for subsequent logical decoding. Therefore, the frequency discrimination circuit with high performance, high reliability and low power consumption is the key to the underwater acoustic transponder.

[0053] For the underwater acoustic response system, the input signals are 10kHz and 12.5kHz modulated waveforms.

[0054] ① If there is no signal, it will always be a fixed level (here is 0 volts, which has no effect on the system).

[0055] ②If there is a signal, the wave...

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Abstract

The invention relates to a low-power-consumption matched filtering method used for distinguishing existing of a signal. The input wave shape which focuses on fixed frequency is processed as a sinusoidal signal, response value of a matched filter is selected as integer value, then periodicity of the response value of the matched filter is utilized, and a filtering output signal is obtained only simply using adding / substracting and dislocation operation. Impulse response of the matched filter is consistent with the input wave shape, the response value of the matched filter is obtained by integer L times sampling of a digital sequence x (n) with a noise signal, and L >=2. Self-correlation technology is used, by simple dislocating and adding and substracting operation, power consumption is reduced compared with a traditional matched filter, and a microprocessor and a programmable logic device can be developed easily, power consumption can be adapted to commercialized requirements, the power consumption is reduced, and simultaneously accuracy is ensured.

Description

technical field [0001] The invention relates to a low-power matching filter applied to communication devices and signal processing equipment, in particular to a low-power matching filtering method for judging the presence of signals. Background technique [0002] In digital communications, messages are usually conveyed by binary coded signals. Analog signals can also be converted to digital signals by an analog-to-digital converter for processing. The transmitted waveform is known, and the receiving device only needs to care about the moment when the waveform appears, and does not need to restore the original waveform. The autocorrelation matched filter is an optimal detector, which can enhance the ability of the signal to resist noise, so that the useful signal can be enhanced and the noise can be suppressed at the same time. When a useful signal exists within a certain period of time, the output of this filter will have a peak value, and no peak value will appear in othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/08
Inventor 索智群乔东海
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI