Narrowband interference suppression method based on weighted score Fourier transform domain

A fractional Fourier, narrow-band interference technology, applied in baseband system components, shaping network in transmitter/receiver, multi-frequency code system, etc.

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a narrow-band interference suppression method based on weighted fractional Fourier transform domain to solve the problem that

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  • Narrowband interference suppression method based on weighted score Fourier transform domain
  • Narrowband interference suppression method based on weighted score Fourier transform domain
  • Narrowband interference suppression method based on weighted score Fourier transform domain

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specific Embodiment approach 1

[0028] Specific implementation mode one: as Figure 1-7 As shown, the narrowband interference suppression method based on the weighted fractional Fourier transform domain described in this embodiment considers a discrete complex number sequence X with a length of N 0 The weighted fractional Fourier transform of (n), let {X 1 (n), X 2 (n), X 3 (n)} are X 0 (n) 1-3 discrete Fourier transform; for the sequence {x(0), x(1), ..., x(N-1)}, its normalized discrete Fourier transform (discrete Fourier transform, DFT) and inverse discrete Fourier transform (inverse discrete Fourier transform, IDFT) are as follows:

[0029] X ( k ) = 1 N Σ n = ...

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Abstract

The invention relates to a narrowband interference suppression method based on a weighted score Fourier transform domain, which belongs to the technical field of digital signal processing. The invention aims at solving the problem that the conventional frequency-based multi-address way has a certain limitation on resistance to burst interference. The narrowband interference suppression method comprises the following steps of: performing serial/parallel conversion; performing alpha-order weighted score Fourier transform; performing data mapping: performing the data mapping on data after the transform to get L data after mapping; mapping data signals into positions with small interference or no interference and writing 0 into the positions without the data at data points with strong interference by adopting an avoidance way in the mapping process on the premise that a system can effectively detect the positions with the interference; performing minus alpha-order weighted score Fourier transform; performing parallel/serial conversion; and performing receiving-end multi-address access pretreatment by matching with the data sending process of a sending end. The data points with the interference can be well avoided by adopting the transform domain multi-address way based on weighted score Fourier transform and an anti-interference purpose can be realized.

Description

technical field [0001] The invention relates to a narrow-band interference suppression method, which belongs to the technical field of digital signal processing. Background technique [0002] Currently, an uplink system of the LTE (Long Term Evolution) standard adopts a single-carrier frequency division multiple access (signal-carrier frequency division multiple access, SC-FDMA) technology to implement multiple access. Different users transmit data on different frequencies. At the same time, this frequency-based multiple access method can reasonably allocate the frequencies of the subcarriers for access users to perform data transmission in frequency bands with better conditions, thereby achieving the purpose of resisting interference at certain frequencies. However, interference in wireless communication often exhibits time-varying characteristics, and burst interference may appear at certain moments or frequency points. The above-mentioned frequency-based multiple access...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
Inventor 沙学军邱昕梅林房宵杰吴宣利吴玮白旭
Owner HARBIN INST OF TECH
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