| 摘要 |
PROBLEM TO BE SOLVED: To enhance the accuracy of frequency control by multi-path selective fading in the case that frame synchronization is taken through equalization after a reception signal with a unique word added thereto is orthogonally detected and complex correlation is taken between the unique word and a known unique word. SOLUTION: A 1st frequency error up to a level at which an adaptive equalizer 5 is activated is detected through the correlation between an output of an orthogonal detector 1 and a unique word 2 whose frequency is offset positively and negatively, a 1st AFC section 4 corrects the error and the signal is equalized. A frequency error correction value resulting from adding the 1st frequency error and a 2nd frequency error that comes from correlation between a unique word 6 and a residual error component from a 2nd frequency error detector 7 at an adder 8 is given to the orthogonal detector 1 to correct the frequency errors. |
