Orthogonal frequency division multiplex demodulation apparatus

Details Orthogonal frequency division multiplex demodulation apparatus Orthogonal frequency division multiplex demodulation apparatus

1994-07-26

1995-11-28

Hsu, Alpus

Multiplex communications

Wide area network

Packet switching

370 23, 370123, 3701053, 375324, 375364, 375371, H04J 100, H04J 1100

Patent

active

054714648

ABSTRACT:
When an orthogonal frequency division multiplex (OFDM) modulated signal is demodulated by discrete Fourier transformation (DFT), DFT is performed using a time window of an accurate phase synchronized with the synchronization symbol. Therefore, first, the reproduction clock is divided to generate a basic time window signal. The results of the DFT processing on the OFDM signal are used to detect the phase deviation and the phase of the basic time window signal is adjusted based on that phase deviation. Preferably, the results of DFT are used for synchronization pull-in to generate a stable time window signal. More preferably a DFT circuit for demodulating the OFDM modulated signal and a DFT circuit for generating a time window signal are provided separately.

REFERENCES:
patent: 4682117 (1987-07-01), Gibson
patent: 5103465 (1992-04-01), Crisler et al.
patent: 5309113 (1994-05-01), Mimura et al.
patent: 5317602 (1994-05-01), Onoda et al.
patent: 5345440 (1994-09-01), Gledhill et al.

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