乘性噪声干扰下通信系统信号偏差控制仿真

Simulation of Signal Deviation Control in Communication System under Multiplicative Noise Interference

采用当前方法控制通信系统的信号偏差时,不能有效去除通信系统信号中存在的乘性噪声,控制后的通信系统的误码率较高,存在去噪效果差和控制效果差的问题。提出乘性噪声干扰下通信系统信号偏差控制方法,采用经验模态分解方法对通信系统信号做初步去噪处理,再结合傅里叶谱相减方法和同态滤波方法去除通信系统信号中存在的乘性噪声。计算数据信号和导频信号在通信系统中的相角差,根据计算得到的相角差构建通信系统信号偏差控制器,在乘性噪声干扰下完成通信系统信号的偏差控制。实验结果表明,所提方法可有效去除通信系统信号中存在的乘性噪声,控制后的通信系统的误码率变低,验证所提方法的去噪效果好、控制效果好。

For the current method, the multiplicative noise in the signal of communication system cannot be effectively removed. The bit error rate is high and the effect of denoising and control is poor. Therefore, a signal deviation control method under multiplicative noise interference was proposed. Empirical mode decomposition was used to reduce the noise of communication system signal. Fourier spectrum subtraction and homomorphism filtering were used to remove multiplicative noise in communication system signal. The phase-angle difference between the data signal and pilot signal in communication system was calculated. According to the phase-angle difference, the deviation controller of communication system signal was constructed. Finally, the deviation control for the communication system signal under the interference of multiplicative noise was completed. Simulation results show that the proposed method can effectively remove the multiplicative noise in communication system signal. Meanwhile, the bit error rate of communication system after control decreases. The proposed method has good denoising effect and control effect.