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DSSS (direct sequence spread spectrum) frequency domain interference detection method

An interference detection, frequency domain technology, applied in electrical components, transmission systems, etc., can solve the problems that automatic classification detection and identification of multiple interference patterns cannot be realized at the same time, limited application range of algorithms, and high computational complexity, so as to ensure correct detection. and recognition, a wide range of applications, the effect of high correct recognition rate

Active Publication Date: 2014-04-23
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

At present, most of the research is to identify and analyze the characteristics of the interference signal from the time domain and frequency domain or the time-frequency mixed domain. The number of characteristic parameters is large, and each feature corresponds to one or several specific interference patterns. Its computational complexity is high
Or some interference detection methods are aimed at identifying a specific interference, and the types of identification are few, and the scope of application of the algorithm is limited, and the automatic classification, detection and identification of multiple interference patterns cannot be realized at the same time.

Method used

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  • DSSS (direct sequence spread spectrum) frequency domain interference detection method
  • DSSS (direct sequence spread spectrum) frequency domain interference detection method
  • DSSS (direct sequence spread spectrum) frequency domain interference detection method

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Embodiment Construction

[0027] refer to figure 1 , figure 1 It is a principle block diagram of the present invention, and the embodiment is according to figure 1 connect. A direct-sequence spread spectrum (DSSS) signal received in an interference environment is a superposition of communication signals, interfering signals, and noise:

[0028] r(t)=s(t)+j(t)+n(t) (6)

[0029] In the formula: r(t)r(t) is the direct sequence spread spectrum signal in the interference environment, and s(t) is the digital signal after spreading. In the DSSS system, the transmitted data is multiplied by the pseudo-random sequence, so that the signal The power spectral density of is similar to white noise; j(t) is the interference existing in the channel; n(t) is Gaussian white noise.

[0030] 1. First, the received signal is transformed by N-point FFT through the FFT transformation module 1, and the time domain signal is transformed into the frequency domain to obtain its spectrum information.

[0031] r...

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Abstract

The invention discloses a DSSS (direct sequence spread spectrum) frequency domain interference detection method, relating to an algorithm of interference detection identification in the DSSS communication field. In the method, an FFE (fast Fourier transform) frequency domain transform is carried out on a received signal in the DSSS communication system so as to obtain the frequency domain information of the DSSS communication system; and under the condition that no interference prior knowledge is required, all kinds of interferences happening in the communication can be analyzed, detected and identified with different methods according to different types, so that two communication parties can select correct anti-interference measures according to different interferences. The method provided by the invention has the characteristics of strong robustness in collecting the characteristic parameters of the interferences and high correct recognition rate of the interferences and the like, does not need interference prior knowledge, and is especially for the DSSS system with interferences at different signal to interference ratios and signal to noise ratios.

Description

technical field [0001] The invention relates to a direct sequence spread spectrum (DSSS) frequency domain interference detection method, which is especially suitable for the application in the direct spread communication system under the environment of noise and interference. Background technique [0002] In modern communication technology, interference is not only caused by the objective electromagnetic environment, but also intentionally generated by humans. Direct sequence spread spectrum DSSS communication has been widely used in military and commercial communications because of its advantages of anti-interference, anti-multipath, signal concealment, good confidentiality, and multiple access capabilities. Better suppression performance. However, in practical systems, the complexity of the transmitter and receiver and the available bandwidth are often limited, and the system performance will seriously deteriorate when subjected to strong interference beyond the interfere...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7105H04B1/7097
Inventor 刘春冉王东卢泳兵
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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