| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio system, radio transmitter and radio receiver in which a phase noise characteristic is improved, thereby improving communication quality. <P>SOLUTION: A radio transmitter 101 transmits a multiplexed signal so multiplexed that a pilot signal is transmitted at the center frequency. A radio receiver 151 then comprises an antenna 152 for receiving a radio signal from the radio transmitter 101, a distributor 159 for distributing the received signal received by the antenna 152 to two directions, a bandpass filter 160 for extracting a signal component corresponding to the pilot signal having the same center frequency as one of the distributed signals distributed by the distributor 159, a delay corrector 162 for delaying the other of the distributed signals, and a quadrature demodulator 163 for multiplying the frequency of the signal component corresponding to the pilot signal extracted by the bandpass filter 160 by the frequency of the other signal delayed by the delay corrector 162 and performing quadrature demodulation. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
