Null detection in DAB, T-DMB, and DAB-IP systems

Details Null detection in DAB, T-DMB, and DAB-IP systems Null detection in DAB, T-DMB, and DAB-IP systems

2007-08-07

2010-06-01

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S142000, C375S150000, C375S343000

Reexamination Certificate

active

07729435

ABSTRACT:
Detecting Null symbols in a video data frame comprises sending OFDM symbols through a sliding windowed correlation process having a correlation window length proportional to a cyclic prefix length and a delay equal to a FFT size of the symbols, wherein output peaks of the process occur where two similar portions of the symbols coincide; checking peaks in windows sized equal to a duration of a symbol; determining whether the peaks are located in the middle of the windows; determining whether a shift has occurred in the location of the peak of a current window compared to in a second immediately previous window; determining whether the peak in a first immediately previous window is weak compared to that in a second immediately previous window; and declaring that a Null symbol exists in the first previous window when the shift has occurred and the determination of a weak peak exists.

REFERENCES:
patent: 6836518 (2004-12-01), Sano et al.
patent: 7020116 (2006-03-01), Nakada

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