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

图3.7
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.....\capacity_AF_DF1.m
.....\capacity_oneway_AF1.m
.....\capacity_oneway_DF1.m
.....\capacity_twoway_AF1.m
.....\capacity_twoway_DF1.m
.....\capacity_upper1.m

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