Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate
2008-04-22
2008-04-22
Vuong, Quochien B. (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
C455S017000, C370S206000, C370S207000, C370S465000, C375S261000, C375S298000
Reexamination Certificate
active
10894062
ABSTRACT:
Adaptive modulation/demodulation method in a radio communication system is provided. A modulation multi-level number in a transmission device and a demodulation multi-level number in a reception device are judged independently from each other according to a propagation condition and communication is performed by controlling the likelihood when the multi-level numbers of the transmission side and the reception side are different. The reception device can perform operation by controlling likelihood information on lower bit of the multi-level modulation even when the modulation multi-level number and the demodulation multi-level number used at the transmission side are different. Moreover, the transmission device and the reception device independently decide the modulation multi-level number and the demodulation multi-level number, thereby following an instantaneous propagation fluctuation and improving the throughput.
REFERENCES:
patent: 6359934 (2002-03-01), Yoshida
patent: 6738646 (2004-05-01), Miyoshi et al.
patent: 2004/0203992 (2004-10-01), Yun
patent: WO 00/62498 (2000-10-01), None
patent: WO 01/08369 (2001-02-01), None
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Shinya Otsuki, “Performance of Modulation Level Controlled Adaptive Modulation Systems” (Electronic Information Society Journal B-II, vol. J78-B-II No. 6, pp. 435-444, Jun. 1995).
Hanaoka Seishi
Tamaki Satoshi
Yano Takashi
Alam Fayyaz
Antonelli, Terry Stout & Kraus, LLP.
Hitachi Communication Technologies Ltd.
Vuong Quochien B.
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