Null symbol detection device

Details Null symbol detection device Null symbol detection device

2007-11-06

2007-11-06

Payne, David O. (Department: 2611)

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

Reexamination Certificate

active

10730271

ABSTRACT:
In a null symbol detection device, at the time of receiving a terrestrial digital broadcast, a null symbol can be stably detected even under a fading environment. A synchronous addition buffer group is provided subsequent to an amplitude detector so as to synchronously add an OFDM signal at a null symbol repetition period. A moving average processing unit performs a moving average operation upon synchronous addition data with the number of samples corresponding to a null symbol to output a moving average value. A transmission mode determining unit detects the minimum value among the moving average values normalized in a correction processing unit and compares levels of the minimum values to determine a reception mode. A null position detector generates a synchronous pulse at a null position.

REFERENCES:
patent: 6731702 (2004-05-01), Nomura
patent: 7006577 (2006-02-01), Kim
patent: 2002/0042661 (2002-04-01), Kim
patent: 1 054 540 (2000-11-01), None
patent: 11-27333 (1999-01-01), None
patent: 2000-315990 (2000-11-01), None
patent: 10-2001-39589 (2001-05-01), None

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