Patent ID: 6584090
Filing Date: 2003-06-24
Classification: H04B

Abstract:
A cellular communication system for communicating code division multiple access (CDMA) and global system for mobile communication (GSM) transmit and receive first information signals, comprising:a transmitting unit for modulating and upconverting a transmit baseband information signal to generate at least one CDMA transmit first information signal and at least one GSM transmit first information signal, the transmitting unit including a modulator for modulating a transmit second local oscillator (LO) frequency with the transmit baseband information signal to generate a transmit second information signal, and a plurality of upconverters for upconverting the transmit second information signal with a GSM transmit first LO frequency to generate the at least one GSM transmit first information signal and for upconverting the transmit second information signal with a CDMA transmit first LO frequency to generate the at least one CDMA transmit first information signal; a transit variable gain amplifier coupled between the modulator and the plurality of upconverters for controllably normalizing the transmit second information signal power level for a plurality of CDMA cellular communication channels; and a receiving unit for downconverting and demodulating at least one CDMA receive first information signal and at least one GSM receive first information signal to generate a receive baseband information signal, the receiving unit including at least one downconverter for downconverting the at least one CDMA receive first information signal with a receive first LO frequency to generate a receive second information signal and for downconverting the at least one GSM receive first information signal with the receive first LO frequency to generate the receive second information signal, and a demodulator for demodulating the receive second information signal with a receive second LO frequency to generate the receive baseband information signal.