(3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请描述：自己用计算机产生的经典谱是正确的依据。-(3) with Simulink tools to write code (S-Function mode), to produce a single path Rayleigh channel Doppler spectrum is the classical spectrum, in which the