OFDM demodulation circuit and OFDM reception apparatus using the same
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United States of America Patent
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Apr 14, 2009
Grant Date -
Dec 9, 2004
app pub date -
Oct 4, 2002
filing date -
Oct 4, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An OFDM demodulation circuit capable of initiating a demodulation process within a short period of time after the reception of a signal and terminating the demodulation early if it has been initiated erroneously, and an OFDM reception apparatus employing the OFDM demodulation circuit. If a threshold value Sth2 in peak detector 122 is not exceeded within a predetermined time T following the output of a symbol timing signal from peak detector 121, namely if a continuation timing signal is not supplied from peak detector 122 to a demodulation process terminating circuit 162 before demodulation process terminating circuit 162 counts predetermined time T (step S115), demodulation process terminating circuit 162, determining that the position at which the demodulation process has been started was wrong, terminates the currently executed demodulation process soon after the completion of the counting of predetermined time T and returns to a received-signal awaiting state (step S111).
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