说明：  OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术，实际上OFDM是MCM(Multi Carrier Modulation)，多载波调制的一种。通过频分复用实现高速串行数据的并行传输, 它具有较好的抗多径衰弱的能力，能够支持多用户接入。 [1] OFDM技术由MCM（Multi-Carrier Modulation，多载波调制）发展而来。OFDM技术是多载波传输方案的实现方式之一，它的调制和解调是分别基于IFFT和FFT来实现的，是实现复杂度最低、应用最广的一种多载波传输方案。
(OFDM (orthogonal frequency division multiplexing) is orthogonal frequency division multiplexing technology. In fact, OFDM is MCM (multi carrier modulation), a kind of multi carrier modulation. The parallel transmission of high-speed serial data is realized by frequency division multiplexing (FDM). It has good anti multipath fading ability and can support multi-user access[ 1] OFDM technology is developed from MCM (multi carrier modulation). OFDM technology is one of the ways to realize the multi carrier transmission scheme. Its modulation and demodulation are based on IFFT and FFT respectively. It is the most widely used multi carrier transmission scheme with the lowest complexity.)