In order to improve the security of spread spectrum communication,a filter-based anti-interference method for spread spectrum communication signals was presented.Firstly,we analyzed the characteristics of hierarchi-cal lapped transforms in spread spectrum communication signals.On this basis,we used a comprehensive filter to re-verse the impulse response time of the communication signal and decompose the spread spectrum communication sig-nal.Secondly,we analyzed the active interference mechanism of spread spectrum communication signals,thus achie-ving the noise interference discrimination and obtaining multi-domain vector conditions of hierarchical lapped trans-forms.Based on the input and output states of the filter,we calculated the estimation error of the spread spectrum communication signal.Moreover,we performed the hierarchical lapped orthogonal transform on the vector of the re-ceived signal,and then corrected the sub-band energy estimation result of the signal.Finally,we used the forward er-ror correction coding method to improve the anti-interference performance of spread spectrum communication signals in weak signal environments,thus ensuring reliable transmission of communication signals.The anti-interference effect of the proposed method under different parameter conditions was verified through experiments.The comparison results show that this method can effectively achieve anti-interference of spread spectrum communication signals.
关键词
多分辨重叠变化/扩频通信/信号抗干扰/子带能量估计
Key words
Hierarchical lapped transforms/Spread spectrum communication/Signal anti-interference/Subband energy estimation
维普
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