说明：  Suzuki信道仿真,用于多路径信道衰落 综合大尺度衰落和小尺度衰落 可用来仿真频率选择性衰落以及时间选择性衰落
(Suzuki channel simulation, which is used to synthesize large-scale fading and small-scale fading in multipath channel. It can be used to simulate frequency-selective fading and time-selective fading.)