Code-division multiple-access base station transmitter

Details Code-division multiple-access base station transmitter Code-division multiple-access base station transmitter

H - Electricity

04

B

H04B 7/216 (2006.01) H04Q 7/30 (2006.01) H04B 1/707 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2179977

In a code-division multiple-access base station transmitter, a digital base-band section includes spread units for directly spreading input transmission data for each channel by different spread codes to output spread signals, a summer for summing the spread signals and for outputting a multiplexed spread signal, a limiter for limiting the amplitude of the multiplexed spread signal so as not to exceed a predetermined value, and a roll-off filter for limiting a transmission spectrum by shaping a waveform of the transmission signal and for outputting a digital base-band signal to an analog base-band/RF section. The analog base-band/RF section converts the digital base-band signal into an analog base-band signal with a digital-to- analog converter, and a carrier is modulated to convert the analog base-band signal into an RF signal in a modulator. The RF signal is amplified in a transmission power amplifier to transmit the amplified RF signal through a transmission antenna.

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