Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2005-11-22
2005-11-22
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S343000, C375S371000, C375S324000, C375S265000, C714S799000
Reexamination Certificate
active
06968021
ABSTRACT:
A bandwidth efficient advanced modulation waveform modem using concatenated iterative turbo coding and continuous phase modulation is disclosed. A demodulator in the modem has a turbo decoder and a decision feedback carrier and time tracking algorithm to track a carrier and adjust timing. The decision feedback carrier and time tracking algorithm may use an APP decoder as a decision device to provide symbol decisions at a high error rate and low latency for a coded input data stream. A symbol phase estimator produces a symbol phase error estimate from the symbol decisions. An erasure decision function decides which symbol decisions are correct and which symbol decisions are erasures. A carrier tracking function receives the symbol phase error estimates when the symbol decisions are correct and receives erasure inputs when the symbol decisions are erasures to maintain carrier tracking.
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“Turbo Detection of Coded Continuous-Phase Modulation” by Thomas L. Tapp and Rodney L. Mickelson, MILCOM 99, Atlantic City, NJ, Nov. 1999.
Mickelson Rodney L.
Tapp Thomas L.
White Steven L.
Whited Joseph C.
Eppele Kyle
Jensen Nathan O.
Munoz Guillermo
Patel Jay K.
Rockwell Collins
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