Synchronization method and apparatus for modems based on...

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Reexamination Certificate

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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.

REFERENCES:
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patent: 6088387 (2000-07-01), Gelblum et al.
patent: 6556632 (2003-04-01), Kubo et al.
patent: 6563877 (2003-05-01), Abbaszadeh
patent: 6621857 (2003-09-01), Belotserkovsky et al.
patent: 2002/0048331 (2002-04-01), Tran et al.
patent: 2002/0097814 (2002-07-01), Eidson et al.
patent: 2002/0186793 (2002-12-01), Kolze et al.
“Turbo Detection of Coded Continuous-Phase Modulation” by Thomas L. Tapp and Rodney L. Mickelson, MILCOM 99, Atlantic City, NJ, Nov. 1999.

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