说明：  在3G,CDMA系统下，并行干扰消除仿真的例子 进行并行干扰消除之后，接收性能比没有进行并行干扰消除好，并且进行多级又比没有进行的好
(In 3G, CDMA system, the parallel interference cancellation example simulation parallel interference cancellation, the receiver performance is not good for parallel interference cancellation and multi-level than no good)