主要用途是对抗多径衰落。由于多径衰落的存在，使得同一个帧由于路径不同，到达用户端的时延有先有后。在相关的频域上的会造成子载波之间的相互干扰，影响 性能。另外，由于有了循环前缀，使得IFFT FFT操作把原来的线性卷积变成循环卷积，大大简化了相应的信号处理复杂度-The main purpose is to fight against multipath fading. Due to the presence of multipath fading, the first after they ha

CMG油藏数值模拟过程中经常自行编写程序进行相关的开发数据处理，进而形成CMG稠油油藏数值模拟所需要的动态数据模型。-CMG numerical reservoir simulation process is often self-programming related to the development of data processing, thus the formation of the CMG heavy oil reservoir numerical simulation of d