Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-02-14
2006-02-14
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S143000, C375S144000, C375S145000
Reexamination Certificate
active
06999499
ABSTRACT:
A demodulation apparatus for a base station of a CDMA mobile communication system is provided, having an analog-to-digital converter device to convert an intermediate frequency signal into a digital signal and provide a quadrature component and an in-phase component of the digital signal, a plurality of filters to filter the components of the digital signal in the low pass band respectively, and a CDMA modem to demodulate the outputs of the plurality of filters. Since direct control by the digital signal of the base-band I channel and Q channel at the intermediate frequency can be performed and the analog-to-digital converter simultaneously performs the QPSK demodulation and the analog-to-digital conversion, the circuit design can be simplified and the characteristics reducing the noise can be obtained.
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Fleshner & Kim LLP
Ghulamali Qutub
LG Electronics Inc.
Patel Jay K.
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