OFDM (the modulation frequency dividers perpendicular), in fact, a modulation band of the base. OFDM, the modulation, as the name suggests, Orthogonal frequency-division multiplexing operations, the Maltese with the use of frequency dividers, of course, for Orthogonal runs.

the concept of Orthogonal in frequency dividers to the orthogonality(orthogonal) signals, which refers to a definition of math can be in which whenever two function sine in the beat. the Integral of this product on any period in time equal to zero would be. In terms of this sort of modulation in the military industry used to which Multi-tone", i.e., a range the frequency to the multiple frequency carriers, or to be more scientific (Sub Carrier) split; and on each of these sub-carrier are part of information sent.

the advantage of this technique is the one sending the data in parallel was no longer overcome the fading, shrinkage, the frequency of R (Frequency Selective Fading), because this is any part of the data on the interval a small fraction of the frequency band shipped that this type of fading, shrinkage, on this interval, small, practically linear, appear and repairable, and ultimately extract the signal.