长波通信中的噪声处理方法研究

摘要

长波通信信号受信道中的大气噪声于扰严重,该噪声属于典型的非高斯非平稳信号,传统的非线性处理方法对大气噪声的抑制效果并不理想,严重制约了长波通信效能的发挥.针对这一问题,论文提出了中值滤波小波降噪的噪声处理方法,以信噪比提高值作为降噪效果的评价指标,在Matlab编程环境下实现了算法对长波信道噪声抑制能力的仿真.结果表明,中值滤波—小波降噪的噪声处理方法能够有效地实现对长波信道噪声的抑制.%The signal of long wave communication was influenced by the atmospheric noise of the channel, which was non-Gausssian anc non-stationary typically, and conventional denoising method failed on it. In this paper, the method of median filter and wavelet threshold de-noising to suppress the VLF atmospheric noise was proposed. The SNR improvement factor was chosen as the indication of the performance improvement, and the simulation was implemented on Matlab platform. The simulation result of this method shown that the new approacr could remove VLF channal noises effectively and improve the system performance.