【摘要】 利用MATLAB/Simulink软件仿真平台,构建了QPSK调制解调信号系统模型,通过自定义仿真模型的建立分析了QPSK调制信号在应对单频干扰、窄带高斯白噪声干扰、调频噪声干扰以及相同调制样式的QPSK信号干扰等干扰样式时的干信比——误码率曲线图,并与理论值进行了检验,综合评价QPSK信号的抗干扰能力。结果表明,在中小信噪比的情况下,QPSK信号抗单频干扰的能力较弱,受干扰程度较大;在大信噪比的情况下,QPSK信号抗窄带高斯白噪声的能力不够,受干扰程度较小。更多还原

【Abstract】 The QPSK modulation and demodulation signal system model is constructed by using MATLAB/Simulink software simulation platform. Through the establishment of the self-defined simulation model,the QPSK modulation is analyzed in response to single tone interference, narrowband Gaussian white noise interference, frequency modulation noise interference, QPSK signal interference and other interference styles by JSR-BER plots. It is tested with the theoretical value so as to comprehensively evaluate the antiinterference ability of the QPSK signal. The experiment results indicate that the ability of QPSK signal to resist single-frequency interference is fairly weak, and the degree of interference is large in the case of medium and small SNR, while in the case of large SNR, the ability of QPSK signal to resist narrow-band Gaussian white noise is not enough, and the interference degree is small.更多还原