Decoders for many-carrier signals, in particular in DVB-T receivers
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United States of America Patent
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May 22, 2007
Grant Date -
Dec 12, 2002
app pub date -
May 2, 2002
filing date -
May 3, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A DVB-T receiver includes a channel equalizer, a metric assignment and demapping circuit, a Viterbi decoder and an outer Reed-Solomon decoder. The metric assignment and demapping circuit includes a soft-decision quantising arrangement which provides confidence values for the Viterbi decoder. The quantising arrangement receives a control input from channel state indication (CSI) measurement circuitry.A further channel state indication is obtained on a symbol-by-symbol basis. This is compared an average obtained over a few symbols, to detect impulsive interference, and applied as part of the control for the soft-decision quantiser.A signal derived from the further channel state indication is also applied to the erasures input of the Reed-Solomon decoder.
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