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，OFDM系统的各子信道信号的分离（解调）是靠这种正交性来完成的。另外，OFDM的个子信道上还可以采用多进制调制（如频谱效率很高的QAM），进一步提高了OFDM系统的频谱效率。第二，实现比较简单-, OFDM system channel signal separation (demodulation) is relying on this orthogonality to be completed. In addition, OFDM the sub-channel can also use M-ary modulation (such as high spectrum efficiency and QAM), to further improve the spectrum efficiency of OFDM system. Second, to achieve relatively simple
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