| 摘要 |
PURPOSE: A transmitter apparatus a CDMA system is provided to be easy to design a high speed circuit by constructing a base band filter suing a simple control circuit, an adder and a shifter. CONSTITUTION: In a transmitter apparatus, a base band filter part(200) includes base band filters(101,103) for filtering I and Q signals of a pilot channel to limit a band width, and base band filters(105,107) for filtering I and Q signals of other channels except for the pilot channel to limit the band width. Multipliers(120,122) multiply a power rate to the I and Q signals of the pilot signal according to the pilot signal, and multipliers(124,126) multiply a power rate to the I and Q signals of other channels except for the pilot channel according to each channel. A first adder(130) adds all I and Q signals, that is, output signals of the multipliers(120,124), and a second adder(132) adds all Q channel signals, that is, output signals of the multipliers(122,126). A first D/A converting part(140) converts an output signal of the first adder(130) into an analog signal, and a second D/A converting part(150) converts an output signal of the second adder(132) into an analog signal. |
