Modulation device, demodulation device, communication system...

Details Modulation device, demodulation device, communication system... Modulation device, demodulation device, communication system...

2006-04-25

2006-04-25

Tran, Khanh (Department: 2631)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S206000

Reexamination Certificate

active

07035340

ABSTRACT:
A QAM modulation system capable of setting a number of multilevel to approximate 2(p+0.25)(p is an integer equal to or more than 3) or 2(p+q
). An input data signal of 4p+1 bits are converted into four signals of p+1 bits, there being a predetermined relationship between the input data signal and the converted signals. The converted four signals are assigned to four phase planes, respectively. The four signals are time-division multiplexed and multilevel-modulated. Thereby, it becomes possible to set the number of multilevel to approximate 2(p+0.25).

REFERENCES:
patent: 4646326 (1987-02-01), Backof et al.
patent: 5185763 (1993-02-01), Krishnan
patent: 5222077 (1993-06-01), Krishnan
patent: 6421395 (2002-07-01), Wei
patent: 6553063 (2003-04-01), Lin et al.
patent: 4-196945 (1992-07-01), None
Weidenfeller, Hermann, Vlcek, Anton: Digitale Modulationsverfahrenmit Sinusträger, Anwendung in der Funktechnik, 199?, Berlin u.a., Springerverlag, ISBN 3-540-60022-X, pp. 149-151 and 271-279.
Vlcek, Anton; Weindenfeller, Hermann: Digitale Modulationssysteme der Kategorie APK mit beliebiger geradzahliger und ungeradzahliger Stufenzahl, Teil I und II. IN: Frequenz 45 (1991) 1-2, pp. 38-44 and 45 (1991) 3-4, pp. 66-72.

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