Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2011-03-22
2011-03-22
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S278000, C375S284000, C375S296000, C375S346000, C375S348000
Reexamination Certificate
active
07912156
ABSTRACT:
Method and apparatus are disclosed for obtaining improved performance when using Forward Error Correction (FEC) with channels experiencing block fading or burst jamming over some number of contiguous symbols. One suitable application is when the channel is periodically obstructed due to the rotation of a propeller blade, resulting in a periodic block fading channel. During operation zero symbols are inserted into the received signal stream, prior to the FEC decoder at times that are estimated or otherwise determined to correspond to periods of jamming or severe fading. The zero symbols effectively “erase” the severely degraded symbols. The zero symbols are less detrimental to the FEC decoder than the severely degraded symbols, especially when the channel interleaving/de-interleaving operations result in the zero symbols being temporarily distributed over a large block of received symbols.
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Abbaszadeh Ayyoob
Giallorenzi Thomas R.
Hall Eric K.
Harrington & Smith
L-3 Communications Corporation
Liu Shuwang
Timory Kabir A
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