| 摘要 |
<P>PROBLEM TO BE SOLVED: To more correctly measure a symbol point of a reception signal. <P>SOLUTION: In a symbol point estimating device 1, the symbol point of the reception signal z(k) is estimated by deciding a time delay value τ between a sampling point of the reception signal z(k) sampled by a sampling frequency fs and the symbol point of the reception signal z(k). The device consists of a multiplication product sum output part 10 for outputting a product sum Ae<SP>jθ</SP>between a multiplication result Y(n)=Z(n)R(n)<SP>*</SP>between a complex conjugate R(n)<SP>*</SP>of a frequency component R(n) in an ideal signal r(k) and a frequency component Z(n) of the reception signal z(k), and a sampling angular frequency Δω (=2πfs/N;N is error component calculation length between the ideal signal r(k) and the reception signal z(k)); and of a time delay value deciding part 20 deciding the time delay value τ so that an error component EVM between the ideal signal r(k) and the reception signal z(k) becomes the minimum on the basis of an output of the multiplication product sum output part 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
