对信号进行频谱分析及滤波，单径或多径瑞利衰落信道仿真，现代信号处理中谱估计在matlab中的使用，考虑雨衰 阴影 和多径影响，主要为数据分析和统计。- The signal spectral analysis and filtering, Single path or multipath Rayleigh fading channel simulation, Modern signal processing used in the spectral estimation in matlab, Consider shadow rain attenuation and multipath effects Mainly for data analysis and statistics.