| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a spurious radiation signal caused within a frequency band of a multi-carrier modulation signal. <P>SOLUTION: The transmission apparatus of this invention having an input port and an output port and transmitting a multi-carrier modulation signal, is provided with: a high speed digital / analog converter means for receiving I and Q components of a digital transmission signal and converting the multiplexed signal of them into an analog signal; an RF circuit means for converting the analog signal into an RF signal forming a multi-carrier modulation signal and outputting the RF signal from the output port; a control means coupled to the input port to set a power supply voltage to be supplied to the high speed digital / analog converter means; and a storage means coupled to the control means. The power supply voltage which the control means receives from the input port and allows the storage means to store is a value to give a lower limit of a spurious radiation signal within a prescribed voltage range and the frequency of the spurious radiation signal is decided depending on a data sampling frequency and the multi-carrier frequency. <P>COPYRIGHT: (C)2004,JPO |
