信道主要模拟信号的多径传输，在这个信道中一共有三个用户的数据进行传输，用户一经过了2径衰落，用户二经过了3径衰落，用户三经过了4径衰落。-The main channel simulation of multipath signal transmission, in this channel has a total of three users of the data transmission, the user after 2 path fading, the user of two after 3 path fading, the user of three after 4 path fading.