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。



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。



在通信系统中，信道所能提供的带宽通常比传送一路信号所需的带宽要宽得多。如果一个信道只传送一路信号是非常浪费的，为了能够充分利用信道的带宽，就可以采用频分复用的方法。-OFDM (Orthogonal Frequency Division Multiplexing) that is orthogonal frequency division multiplexing, OFDM is a fact MCM (Multi Carrier Modulation), multi-carrier modulation.



OFDM technology was developed by MCM (Multi-Carrier Modulation, multi-carrier modulation) evolved. OFDM technology is one way to achieve a multi-carrier transmission scheme, its modulation and demodulation, respectively, based on IFFT and FFT to achieve, is to achieve the least complex, the most widely used of a multi-carrier transmission scheme.



In the communication system, the bandwidth of the channel can provide is usually higher than the bandwidth required to transmit a signal all the way to much wider. If a channel carries only one signal is very wasteful, in order to take full advantage of the bandwidth of the channel, you can use frequency division multiplexing method.