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Frequency scanning interference suspending method for direct sequence spread spectrum communication system

A direct sequence spread spectrum and communication system technology, applied in multi-frequency code systems, transmission systems, radio transmission systems, etc., can solve the problems of system bit error rate performance degradation, signal-to-noise ratio loss, etc., and achieve less signal energy loss Effect

Inactive Publication Date: 2009-03-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0017] In the direct-sequence spread spectrum system, in order to solve the problem that the signal-to-noise ratio loss is too large to cause the performance of the system bit error rate to decrease in the frequency-sweeping interference suppression, the present invention proposes a fractional Fourier transform interference with windowing and segmental overlapping processing suppression method

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  • Frequency scanning interference suspending method for direct sequence spread spectrum communication system
  • Frequency scanning interference suspending method for direct sequence spread spectrum communication system
  • Frequency scanning interference suspending method for direct sequence spread spectrum communication system

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Embodiment Construction

[0061] According to the above discussion in the "Summary of the Invention" section, the method of the present invention will be described in detail below in conjunction with the accompanying drawings and practical examples.

[0062] The scanning interference suppression method based on the direct sequence spread spectrum system proposed by the present invention, its principle block diagram can be found in the attached Figure 4 And attached Figure 5 , the specific implementation methods are summarized as follows:

[0063] Suppose the input signal f(x) is mixed with 2 different modulation frequencies {μ 0 , μ 1} The direct spread communication signal of frequency sweep interference, the length N is 8192 points, the realization steps are as follows:

[0064] (1) Take the step Δp=0.01, p ∈ (0, 1), and perform a total of 100 fractional-order Fourier transforms of p-order on the input signal f(x), and estimate the parameters of the frequency-sweeping interference signal through...

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Abstract

The invention provides a method for disturbing and inhibiting fractional fourier transformation through adding window segmentation overlapped processing, which comprises: firstly, utilizing the differences between the noise characteristics of a direct-spread communication signal on a fractional fourier region and the energy focusing characteristics of a sweep frequency interfering signal on a corresponding order, finishing the separation between the communication signal and the sweep frequency interference, then, utilizing window functions to inhibit the characteristics of side lobes of the sweep frequency interference, reducing the side lobe leakage of the interfering signal after transformation, enabling the energy of the sweep frequency interference on the fractional fourier region to focus on a major lobe, thereby effectively separating the interference and an useful signal, finally, adopting a method of segmentation overlapped processing, solving the problem that the energy of an edge signal is low due to adding window, inhibiting the energy of the sweep frequency interfering signal to the maximum, simultaneously, guaranteeing signal energy loss as little as possible, achieving higher code error rate performance, and guaranteeing reliable communication of a direct-spread system.

Description

technical field [0001] The invention relates to an interference suppression method, which belongs to the technical field of communication anti-interference and is used for suppressing frequency-sweep interference in a direct-sequence spread spectrum communication system. Background technique [0002] Direct-sequence spread spectrum system (referred to as DS system) has unique advantages such as strong anti-interference ability, concealment of information signal, easy encryption, arbitrary site selection, and easy networking. Therefore, DS technology is currently widely used in communication equipment. Due to its own coding gain and processing gain, the spread spectrum system has a certain anti-interference ability, but the complexity of the transmitter / receiver and the available bandwidth limit the upper limit of the processing gain. When there is strong interference, the performance of the spread spectrum system will seriously deteriorate. [0003] Linear frequency modulat...

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Application Information

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IPC IPC(8): H04B1/707H04B7/216H04B1/7097H04L27/26
CPCY02D30/70
Inventor 陶然黄克武黄琰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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