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Single-tone interference filtering method and device

A single-tone interference and filtering device technology, applied in the automatic control of power, electrical components, etc., can solve the problems of effective signal influence, inaccurate tracking, etc., and achieve the effect of improving reliability, simple structure, and easy implementation

Inactive Publication Date: 2017-01-18
SHANGHAI RES CENT FOR WIRELESS COMM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot accurately track the changing single tone; slotting will still have a certain impact on the effective signal while filtering out single-tone interference

Method used

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  • Single-tone interference filtering method and device
  • Single-tone interference filtering method and device
  • Single-tone interference filtering method and device

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Embodiment Construction

[0044] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0045] The object of the present invention is to provide a single-tone interference filtering method and device for filtering the single-tone interference component of the in-band signal. The principles and implementations of the single-tone interference filtering method and device of the present invention will be described in detail below, so that those skilled in the art can understand the single-tone interference filtering method an...

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Abstract

The invention provides a single-tone interference filtering method and device. The single-tone interference filtering method comprises the steps of acquiring the frequency at which an initial single-tone interference signal is located, setting an initial frequency control word of a numerically controlled oscillator according to the frequency at which the initial single-tone interference signal is located; capturing the frequency of a single-tone interference signal in an input signal by using a Costas loop, and keeping tracking the frequency and the phase of the single-tone interference signal in the input signal; carrying out filtering by using a control signal acquired by multiplying a local oscillation signal generated by the numerically controlled oscillator and the input signal to acquire amplitude information of the single-tone interference signal in the input signal; modulating the local oscillation signal according to the amplitude information to acquire a local single-tone interference signal; and subtracting the local single-tone interference signal from the input signal so as to realize filtering of the single-tone interference signal. The method provided by the invention has extremely small influences for original useful signals while filtering the single-tone interference signal, and can track variations in the single-tone frequency within a certain range.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a single-tone interference filtering method and device. Background technique [0002] At present, in communication systems, especially in broadband communication systems, due to the influence of harmonics or spurious and external environment and other factors, the system often receives single-tone interference. In existing communication systems, time-domain transmission signals pass through channel This is then mixed with narrowband single-tone interference, which is complex exponential: [0003] [0004] Among them, A 0 is the amplitude of single-tone interference, φ 0 is the initial phase of the single-tone interference, f 0 is the frequency of the known single-tone interference. After the time-domain signal mixed with single-tone interference reaches the receiving end, the narrow-band single-tone interference needs to be filtered, otherwise it wil...

Claims

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Application Information

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IPC IPC(8): H03L7/085H03L7/093
Inventor 赵天朱正航钱骅
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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