3.9　本章小结

首先，介绍了单载波调制和多载波调制系统，单载波面临的技术挑战以及多载波系统传输方案。然后，详细介绍了OFDM系统原理，包括每个模块的实现原理和相关技术。最后，详细分析了 DCO-OFDM、ACO-OFDM、U-OFDM和Flip-OFDM的收发端原理，并且从理论上分析了DCO-OFDM和ACO-OFDM系统的信噪比，还对两者的性能进行了比较研究。

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