Multiplex communications – Generalized orthogonal or special mathematical techniques – Fourier transform
Patent
1997-02-18
1999-09-14
Olms, Douglas W.
Multiplex communications
Generalized orthogonal or special mathematical techniques
Fourier transform
370350, 370503, H04J 1100, H04J 306
Patent
active
059533110
ABSTRACT:
A method and apparatus are disclosed for determining the boundaries of guard intervals of data symbols being received in a coded orthogonal frequency division multiplexed signal. Temporal samples separated by an interval of an active interval of a data symbol are associated in pairs, and difference signals obtained. The dispersion of a first comparison block of difference signals is determined, and compared to the dispersion of a second comparison block of difference signals, the second comparison block being displaced from the first comparison block by n samples. An F ratio is calculated for the dispersions of the two blocks. F ratios are iterated in a succession of comparison blocks, and a signal representing the F ratios subjected to peak detection. The peaks represent the boundaries of the symbol's guard interval. This information is utilized in synchronizing an FFT window for subsequent signal reconstruction.
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Claydon Anthony Peter John
Davies David Huw
Parker Jonathan
Bollella Donald
Discovision Associates
Gaetje Clay E.
Masaki Keiji
Olms Douglas W.
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