Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2005-03-15
2005-03-15
Bayard, Emmanuel (Department: 2631)
Pulse or digital communications
Receivers
Angle modulation
Reexamination Certificate
active
06868131
ABSTRACT:
A demodulation apparatus that shortens demodulation time and performs efficient high-quality demodulation control. A digital signal generating section generates digital signals corresponding to phase axes from a modulated input signal. A frequency correction value outputting section outputs a frequency correction value. A frequency correcting section gives a frequency offset to digital signals on the basis of a frequency correction value to generate frequency-corrected signals. A timing recovering section performs timing recovery by extracting symbol timing for frequency-corrected signals. A C/N detecting section detecting C/N from a symbol. An optimum frequency correction value determining section treats a frequency correction value corresponding to the maximum C/N value as an optimum frequency correction value. A carrier recovering section performs carrier recovery by correcting finally a shift in the frequency of a signal on which a frequency correction by the use of an optimum frequency correction value and timing recovery have been made. A synchronization detecting section makes an error correction on a symbol and detects a unique word.
REFERENCES:
patent: 5602835 (1997-02-01), Seki et al.
patent: 5646935 (1997-07-01), Ishikawa et al.
patent: 5673293 (1997-09-01), Scarpa et al.
patent: 5774450 (1998-06-01), Harada et al.
patent: 6005640 (1999-12-01), Strolle et al.
patent: 6032033 (2000-02-01), Morris et al.
patent: 6108525 (2000-08-01), Takemura
patent: 6147713 (2000-11-01), Robbins et al.
patent: 6314083 (2001-11-01), Kishimoto et al.
patent: 6385237 (2002-05-01), Tsui et al.
patent: 6545532 (2003-04-01), Maalej et al.
patent: 6590872 (2003-07-01), Shiue et al.
patent: 6717993 (2004-04-01), Shiraishi et al.
patent: 02203645 (1990-08-01), None
patent: 07297872 (1995-11-01), None
patent: 2000236364 (2000-08-01), None
Valerie Cueff et al. QML Algorithm near Cramer Rao Bound for Phase and Frequency Estimation. IEEE Vehicular Technology Conference, pp. 586-589,May 2000.
Yi-Pin Eric Wang et al. Initial Frequency Acquistion in W-CDMA. IEEE Vehicular Technology Conference, pp. 1013-1017, Sep. 1999.
D.W.Park, et al. An Asynchronous Digital Demodulator for TDMA. International Conference on Universal Personal Communications, pp. 431-435, Oct. 1993.
Michel Terre et al. QML-MC Algorithm for Frequency Estimation on Multipath Channels. IEEE Vehicular Technology Conference, pp. 1639-1643, May 2001.
Bayard Emmanuel
Fujitsu Limited
Katten Muchin Zavis & Rosenman
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