Quadrature modulator with pulse-shaping

Details Quadrature modulator with pulse-shaping Quadrature modulator with pulse-shaping

2007-01-02

2007-01-02

Ha, Dac V. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S298000, C375S235000

Reexamination Certificate

active

10451094

ABSTRACT:
An IQ modulator and method for modulating a signal in accordance with I and Q symbols using derivative FIR's operating at the symbol rate and programmable multi-accumulators for waveform generator.This provides advantages that reduced complexity is produced compared with traditional FIR's by a factor equal to the quotient of oversampling ratio and derivative order; programmability to Digital Very Low IF mode transmission is possible; the same circuit may perform interpolation for narrow band MA's; and reduced sets of coefficients enable implementation of two sets of coefficients for MA's, allowing fast handover between MA's such as EDGE and IS136.

REFERENCES:
patent: 5270953 (1993-12-01), White
patent: 5870431 (1999-02-01), Easton et al.
patent: 6031431 (2000-02-01), Vinekar
patent: 6570907 (2003-05-01), Dent et al.
patent: 0 881 764 (1998-12-01), None
patent: WO93/00737 (1993-01-01), None
PCT/EP01/11563 International Search Report mailed Mar. 14, 2002.

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