Multiplex communications – Generalized orthogonal or special mathematical techniques – Fourier transform
Reexamination Certificate
2008-04-15
2008-04-15
Vu, Thong (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Fourier transform
C370S208000, C375S362000
Reexamination Certificate
active
10327913
ABSTRACT:
Difference between a received signal which is an OFDM modulated signal having a guard interval and a delayed signal acquired by delaying the received signal by time equivalent to a data interval is calculated, a reference signal of an FFT calculation window is generated based upon the acquired result of the calculation of the difference and a predetermined threshold and a boundary between symbols is detected. As a result, the boundary between symbols can be stably detected, compared with a method of detecting a boundary between symbols based upon the result of the correlation calculation of the guard interval and the demodulation of received data is also stably enabled in multipath phasing and ghost.
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Sakata Satoshi
Tsukamoto Nobuo
Hitachi , Ltd.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Vu Thong
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