| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide techniques with which frequency characteristics can be estimated more accurately in a mobile reception environment. <P>SOLUTION: The reception apparatus for receiving a transmission signal of a digital transmission scheme in which an SP (Scattered Pilot) is inserted using an OFDM modulation scheme, comprises: a frequency characteristic estimation unit 110 including a frequency characteristic estimation section 1 for estimating frequency characteristics using SPs of preceding and following three symbols and a frequency characteristic estimation section 2 for estimating frequency characteristics symbol by symbol; an amplitude variation detection unit 112 for detecting the amplitude variation of a carrier sent out for each symbol with a fixed amplitude; and a switcher 114 for switching the frequency characteristics resulting from the frequency characteristic estimation sections 1, 2 in accordance with a variation speed resulting from the amplitude variation detection unit 112. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
