| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of errors in symbol determination, even if the statistical trend is different from symbol to symbol.SOLUTION: A digital filter 10 is used for demodulation of a signal subjected to multilevel phase modulation. The digital filter 10 includes a storage unit 11 for storing a plurality of tap coefficients set for each symbol that is identified in the multilevel phase modulation, a selection unit 12 for selecting a first tap coefficient cfrom the plurality of tap coefficients based on the first coordinate information xinputted on a complex plane, and an estimation unit 13 for estimating the second coordinate information aon the complex plane based the first coordinate information xand first tap coefficient c, and outputting the second coordinate information a. |
