Multiplex communications – Generalized orthogonal or special mathematical techniques – Fourier transform
Reexamination Certificate
2006-12-26
2006-12-26
Pham, Chi (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Fourier transform
Reexamination Certificate
active
07154847
ABSTRACT:
A Fast Fourier Transforming apparatus and method thereof for compensating for an OFDM output bit signal is described. The apparatus includes an input buffer unit for storing and outputting a received OFDM bit signal and a butterfly operation unit for performing a butterfly operation according to a radix algorithm. The apparatus comprises a scale detection unit for calculating and outputting a scale factor which is a division factor used for controlling a bit value of a butterfly operated signal input from the butterfly operation unit at each of the stages to a predetermined bit limit of the received OFDM signal, a scale count unit for cumulative counting a count figures corresponding to the scale factor input from the scale detection unit and outputting the result, and a compensation unit for controlling the bit of a signal input from the butterfly operation unit according to result values from the scale detection unit and the scale count unit and outputting the result.
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patent: 2003/0142764 (2003-07-01), Keevill et al.
Ly Anh-Vu
Pham Chi
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