Windowing function for maintaining orthogonality of channels in the reception of OFDM symbols
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United States of America Patent
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Jul 31, 2001
Grant Date -
N/A
app pub date -
Apr 26, 1999
filing date -
Apr 26, 1999
priority date (Note) -
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Abstract
A windowing mechanism for processing an OFDM symbol is presented. The windowing mechanism applies an apodizing window function having the property W.sub.j +W.sub.(FFTSize/2 +j) =constant, where FFTSize is the size of the FFT sample, to a received OFDM symbol sample and a time-offset version of the OFDM symbol sample to produce sets of windowed values. The time-offset sample is offset from the original symbol by one half the symbol period. The time-offset windowed sample is shifted into realignment with the windowed original symbol. Corresponding ones of the windowed values are summed together to restore the windowed symbol to its original form.
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