| 摘要 |
<P>PROBLEM TO BE SOLVED: To flexibly improve data transmission efficiency and improve quality of data. <P>SOLUTION: Frame configuration determining section 101 decides the communication situation, based on transmission path information indicating the level of fluctuations of the transmission path due to fading and data transmission speed information indicating the transmission speed of the transmission data based on the level of a reception signal, and determines the interval of inserting a known pilot symbol and the modulation system of a transmission digital signal. Quadrature baseband modulation section 102 modulates the transmission digital signal to a quadrature baseband signal, according to the modulation system instructed from frame configuration determining section 101. Pilot symbol generating section 103 generates a pilot symbol known between the transmitting and receiving sides. Frame configuration section 104 inserts the known pilot symbol output from pilot symbol generating section 103 into the output signal from quadrature baseband modulation section 102, at the insertion interval instructed from frame configuration determination section 101 and configures a frame. <P>COPYRIGHT: (C)2007,JPO&INPIT |
