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Spread spectrum signal demodulation device based on narrow-band interference adaptive elimination

A narrow-band interference and spread-spectrum signal technology, which is applied in the field of spread-spectrum signal demodulation devices, can solve problems such as signal distortion, affecting receiving performance, and difficult selection of notch thresholds, achieving small demodulation loss, stable and reliable performance, and portability strong effect

Pending Publication Date: 2022-07-12
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

However, the frequency domain notch also has certain defects. First, it is difficult to select the notch decision threshold. Second, the frequency domain notch will cause signal distortion and affect the receiving performance.

Method used

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  • Spread spectrum signal demodulation device based on narrow-band interference adaptive elimination
  • Spread spectrum signal demodulation device based on narrow-band interference adaptive elimination
  • Spread spectrum signal demodulation device based on narrow-band interference adaptive elimination

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Embodiment Construction

[0029] The present invention will be further explained below in conjunction with the accompanying drawings.

[0030] refer to figure 1 , a kind of spread spectrum signal demodulation device based on narrowband interference adaptive elimination, including digital-to-analog conversion unit 1, digital down-conversion unit 2, matched filter unit 3, narrowband interference adaptive elimination unit 4, despreading unit 5 connected to each other , demodulation unit 6 .

[0031] figure 1 is the principle block diagram of the present invention, and the embodiment is according to figure 1 Connect the lines. The function of the digital-to-analog conversion unit 1 is to convert the intermediate frequency analog signal into a digital signal after being sampled by the AD device; the function of the digital down-conversion unit 2 is to convert the digital intermediate frequency signal sampled by the AD device into digital baseband data; The function is to filter the input data to filter ...

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Abstract

The invention discloses a spread spectrum signal demodulation device based on narrowband interference adaptive elimination, and relates to an interference suppression technology and a digital signal processing technology in the communication field. The device is composed of a digital-to-analog conversion unit, a digital down-conversion unit, a matched filtering unit, a narrow-band interference adaptive elimination unit, a de-spreading unit and a demodulation unit. According to the invention, an intermediate frequency sampling technology is adopted, and a narrowband interference adaptive elimination technology is utilized to complete demodulation of spread spectrum signals. Compared with a traditional spread spectrum signal demodulation device, the spread spectrum signal demodulation device has the advantages of being high in digitization degree, small in demodulation loss, high in anti-interference capacity, stable and reliable in performance and the like, and is particularly suitable for signal demodulation of spread spectrum communication systems in different narrowband interference environments.

Description

technical field [0001] The invention relates to a spread spectrum signal demodulation device in the field of communication, belongs to the field of interference suppression technology and digital intermediate frequency demodulation technology in the field of spread spectrum communication, and is especially suitable for receiving spread spectrum signals in the case of narrowband interference. Background technique [0002] The direct sequence spread spectrum communication technology uses the spread spectrum method to reduce the signal spectral density, which can improve the anti-interference ability and concealment of the communication system. Due to the advantages of low spectral density, anti-interference and anti-interception, the direct spread signal has been widely used in the field of communication. But with the increasingly complex external environment, the anti-interference ability of the demodulator has become the focus and research direction of everyone. [0003] Th...

Claims

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Application Information

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IPC IPC(8): H04B1/71
CPCH04B1/71Y02D30/70
Inventor 刘会红潘申富陈敬乔乔先科汪颜陈义达
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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