In the 1970s, Weinstein and Ebert and other discrete Fourier transformations and Fast Fourier transformations used the entire broadcasting system called Orthogonal Frequency Division to create a system with multiple carrier multiplexes (OFDM).<br>Ortogonal multiplication with frequency splitting is a special mode of transmission with multiple carriers. The discrete Fourier orthogonal multiplication technology with frequency splitting used to transform and invert the transformation to solve the problem of generating many mutually orthogonal substrates and obtaining the original signal substrates. I carry the night, our carrier. Fast Fourier transform application significantly reduces the complexity of the multi-carrier transmission system. OFDM technology has become practical.<br>
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