Method and apparatus for decoding broadcast digital HDTV in the presence of quasi-cyclostationary interference
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United States of America Patent
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Sep 26, 1995
Grant Date -
N/A
app pub date -
Feb 22, 1993
filing date -
Feb 22, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
An HDTV receiver takes advantage of the detailed structure of the NTSC signal, namely the periodicity of the signal caused by the horizontal scan rate, in order to remove co-channel interference. A feedforward circuit is used to form an estimate of a current co-channel interference value from co-channel interference values occurring on previous scan lines. The estimate is subtracted from the signal to remove the co-channel interference at the expense of generating intersymbol interference. The circuit uses a form of decision-feedback equalization (DFE) in order to remove the intersymbol interference. The periodicity of the NTSC signal is exploited to allow the use of a high-rate trellis code in the DFE circuit.
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