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Method for detecting and processing narrow-band interference of DS (Direct Sequence)/FH (Frequency Hopping) hybrid spread spectrum communication system

A hybrid spread spectrum and communication system technology, applied in the field of wireless communication signal processing, can solve problems such as large computing time complexity, save computing resources, facilitate hardware implementation, and improve computing speed.

Inactive Publication Date: 2012-10-24
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The FCME (Forward Consecutive Mean Excision) algorithm is an improvement of the CME algorithm. It is believed that only a few frequency domain values ​​with the smallest amplitude are not disturbed, and the mean value is calculated with the minimum frequency domain value, and then multiplied by the threshold coefficient as the initial Threshold, which avoids the multiple iterative calculations required by the CME algorithm to find the initial threshold, but FCME needs to sort the frequency domain values ​​from small to large. When the data length is long, the calculation time complexity is also relatively large

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  • Method for detecting and processing narrow-band interference of DS (Direct Sequence)/FH (Frequency Hopping) hybrid spread spectrum communication system
  • Method for detecting and processing narrow-band interference of DS (Direct Sequence)/FH (Frequency Hopping) hybrid spread spectrum communication system
  • Method for detecting and processing narrow-band interference of DS (Direct Sequence)/FH (Frequency Hopping) hybrid spread spectrum communication system

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Embodiment Construction

[0029] In order to verify the performance of the algorithm of the present invention, two groups of simulation experiments are carried out.

[0030] Experiment 1: Comparison of the high and low threshold values ​​obtained by the CME, FCME dual-threshold algorithm and the present invention.

[0031] In the simulation, the modulation method of the DS / FH hybrid spread spectrum communication system is BPSK modulation, the spread spectrum code length is 512, the frequency hopping bandwidth is 100M, the spread spectrum bandwidth is 10.24M, and the frequency hopping frequency points are 8. The time domain signal data processed at one time The length N is 4096.

[0032] In the case of a signal-to-noise ratio of -5dB, there are random multi-tone interferences that spread throughout the frequency hopping bandwidth, with an interference-to-signal ratio between 50dB and 80dB, and a random multi-tone interference that accounts for 10% of the entire frequency-hopping system bandwidth, with a...

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Abstract

The invention provides a method for detecting and processing a narrow-band interference of a DS (Direct Sequence) / FH (Frequency Hopping) hybrid spread spectrum communication system. According to the technical scheme, the method comprises the following steps: 1) calculating a frequency domain signal; 2) solving an initial threshold; 3) solving high and low thresholds; and 4) calculating a signal after being subjected to interference rejection. According to the technical scheme provided by the invention, the method belongs to a quick double-threshold algorithm. Besides, according to the method provided by the invention, the calculating speed for solving double thresholds is increased and the amount of the calculation is reduced, so that the consumption of resources is reduced and the practicability of the double-threshold algorithm is boosted.

Description

technical field [0001] The invention belongs to the field of wireless communication signal processing and is used for detecting and processing interference in narrowband interference suppression technology. Background technique [0002] The research on anti-jamming technology of spread spectrum communication began in the late 1970s. In the past 30 years, a lot of research work has been focused on the development and application of effective narrowband interference suppression technology in spread spectrum systems, and its development is still a hot topic for many scholars. At present, the performance improvement of the spread spectrum communication system is mainly to further improve the anti-interference ability of the system by cooperating with the interference suppression technology on the basis of the spread spectrum, so as to achieve the purpose of improving the system performance. [0003] DS (Direct Sequence, direct sequence) / FH (Frequency Hopping, frequency hopping)...

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Application Information

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IPC IPC(8): H04B1/71H04B1/7107
Inventor 梁光明刘东华汪伟
Owner NAT UNIV OF DEFENSE TECH
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