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OFDM
Jul 10, 2007 14:15:36 GMT -5
Post by same7same7same7 on Jul 10, 2007 14:15:36 GMT -5
I would like to ask you one question if it is possible, concerning the OFDM, I am wondering about the physical meaning of the orthognality of the frequency, what does it mean?
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OFDM
Jul 13, 2007 11:33:47 GMT -5
Post by guessoum on Jul 13, 2007 11:33:47 GMT -5
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OFDM
Jul 15, 2007 18:46:38 GMT -5
Post by charan langton on Jul 15, 2007 18:46:38 GMT -5
In intuitive sense we think of orthogonality as perpendicularity. The x , the y axis and the z axis of a Cartesian coordinate system are considered orthogonal.
Sine wave and cosine wave of the same frequency are similarly considered orthogonal becuase we define in mathematical sense as orthogonality as the area under the curve of the product of the two functions. If you try to compute the area under the curve of a frequency and its harmonic frequency (example, f1 = 2.3 Hz , 2x2.3 = 4.6 Hz or 4 x 2.3 = 9.2 Hz) then the computed area over one period will be zero.
Maybe not very intuitive but that is the definition of orthogonality and that is the relation the carrier frequencies in OFDM maintain.
Charan Langton
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