Broadband Interference Suppression Method Based on Waveform Reconstruction
A waveform reconstruction and broadband interference technology, which is applied in the field of communication, can solve the problems of unsatisfactory phase modulation signal suppression effect, limited broadband interference signal suppression effect, and interference signal elimination, so as to improve anti-interference ability, reduce implementation complexity, The effect of simple structure
Active Publication Date: 2019-03-26
XIDIAN UNIV
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[0004] Among the existing interference suppression methods, there are mainly some suppression methods such as spatial processing method using antenna array, frequency domain cancellation method and chirp broadband interference, but these methods have their own limitations
The system that uses antenna arrays for interference suppression mainly relies on interference signals and useful signals to process different spatial orientation information, but this technology has a very limited effect on broadband interference signal suppression. In order to suppress broadband interference well , the number of array antennas must be increased, which increases the complexity of implementation; the method based on frequency domain interference elimination is only suitable for narrowband interference suppression, because broadband interference signals and useful signals are basically mixed together in the frequency domain, from the frequency domain cannot Directly eliminate the interference signal; linear frequency modulation is a common modulation method. For this type of signal, the most widely used technology is the discrete Chirp-Fourier transform method, which is an extension of the discrete Fourier transform and can effectively suppress the linear frequency modulation interference signal. , but the suppression effect on the phase modulation signal is not ideal
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[0025] Embodiments and effects of the present invention are further described below in conjunction with the accompanying drawings:
[0026] refer to figure 1 , the existing spread spectrum communication system, its transmitting end includes a coded modulator, spread spectrum module, shaping filter, intermediate frequency transmitter and D / A converter; its receiving end includes a down conversion receiver, A / D converter, Matched filter and useful signal processing module; the signal source at the sending end undergoes coding, modulation, spread spectrum and shaping filtering in sequence, and then the signal is sent out through D / A conversion and up-conversion processing, and Gaussian white noise and interference signals are added to the channel ; The receiving end converts the signal into a baseband digital mixed signal through down-conversion processing and A / D conversion, and then obtains useful information through matched filtering, synchronous capture, despreading and demod...
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The invention discloses a broadband interference inhibition method based on waveform reconstruction. A problem that the anti-interference capacity to an oppressive broadband interference signal in the existing spread-spectrum communication (SSC) system is insufficient is mainly solved. The technical scheme is as follows: adding an interference inhibition module based on the waveform reconstruction before the matching filter of the SSC system, namely, obtaining an interference sequence through the interference signal element rate estimation, the timing synchronization and the interference signal demodulation in order, and then reconstructing an interference signal according to the obtained interference sequence; and realizing the inhibition on the interference signal through the delay offset; and finally acquiring available information from the residual signal of the inhibited interference signal through the matching filtering, synchronous capturing, dispreading and demodulation decoding of an original system in order. By using the inhibition method disclosed by the invention, the large=power broadband interference digital signal is effectively inhibited, the structure is simple, the realization complexity is low, and the method can be used for improving the anti-interference capacity of the communication system.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for suppressing broadband digital interference signals, which is used to enhance the anti-interference capability of a communication system and improve the effectiveness of signal transmission. Background technique [0002] Modern communication systems will be affected by various interferences in the actual space environment, which will seriously damage the processing performance of received signals. Therefore, improving the anti-interference ability of communication systems is of great significance to the guarantee of communication quality. Today's main anti-interference communication technologies include: short burst communication technology, diversity reception technology and spread spectrum communication technology, among which spread spectrum communication technology has become the main One of the most advanced communication technologies, it is wid...
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IPC IPC(8): H04B1/7097
CPCH04B1/7097
Inventor 王勇超寇辰光白杨
Owner XIDIAN UNIV