| 摘要 |
PURPOSE: A device for reducing a CF(Crest Factor) rate in a CDMA mobile communication system is provided to reduce a CF rate increased when supporting a multi FA(Frequency Allocation) function. CONSTITUTION: The first to the third channel card(11-13) deliver CDMA baseband signals to an I channel and a Q channel by FAs(0FA,1FA,2FA). The first to the third digital modulator(21-23) modulate each FA signal. A coupler(30) couples each output signal of the first to the third digital modulator(21-23). A digital to analog converter converts an inputted digital signal into an analog signal. The first frequency up converter(51) converts the analog signal into an IF. A band filter(52) filters the IF with a set band. The second frequency up converter(53) upwardly converts the IF to a high frequency. A front-end unit(61) power-amplifies the high frequency, and delivers the high frequency outside through an antenna(62).
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